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the BB member to the current basic block after emitting instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53567 91177308-0d34-0410-b5e6-96231b3b80d8
5756 lines
219 KiB
C++
5756 lines
219 KiB
C++
//===-- SelectionDAGISel.cpp - Implement the SelectionDAGISel class -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This implements the SelectionDAGISel class.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "isel"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/CodeGen/ScheduleDAG.h"
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#include "llvm/Constants.h"
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#include "llvm/CallingConv.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/InlineAsm.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/ParameterAttributes.h"
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#include "llvm/CodeGen/Collector.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SchedulerRegistry.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Timer.h"
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#include <algorithm>
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using namespace llvm;
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static cl::opt<bool>
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EnableValueProp("enable-value-prop", cl::Hidden);
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static cl::opt<bool>
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EnableLegalizeTypes("enable-legalize-types", cl::Hidden);
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#ifndef NDEBUG
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static cl::opt<bool>
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ViewISelDAGs("view-isel-dags", cl::Hidden,
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cl::desc("Pop up a window to show isel dags as they are selected"));
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static cl::opt<bool>
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ViewSchedDAGs("view-sched-dags", cl::Hidden,
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cl::desc("Pop up a window to show sched dags as they are processed"));
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static cl::opt<bool>
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ViewSUnitDAGs("view-sunit-dags", cl::Hidden,
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cl::desc("Pop up a window to show SUnit dags after they are processed"));
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#else
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static const bool ViewISelDAGs = 0, ViewSchedDAGs = 0, ViewSUnitDAGs = 0;
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#endif
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//===---------------------------------------------------------------------===//
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///
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/// RegisterScheduler class - Track the registration of instruction schedulers.
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///
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//===---------------------------------------------------------------------===//
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MachinePassRegistry RegisterScheduler::Registry;
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//===---------------------------------------------------------------------===//
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///
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/// ISHeuristic command line option for instruction schedulers.
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///
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//===---------------------------------------------------------------------===//
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static cl::opt<RegisterScheduler::FunctionPassCtor, false,
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RegisterPassParser<RegisterScheduler> >
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ISHeuristic("pre-RA-sched",
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cl::init(&createDefaultScheduler),
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cl::desc("Instruction schedulers available (before register"
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" allocation):"));
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static RegisterScheduler
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defaultListDAGScheduler("default", " Best scheduler for the target",
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createDefaultScheduler);
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namespace { struct SDISelAsmOperandInfo; }
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/// ComputeLinearIndex - Given an LLVM IR aggregate type and a sequence
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/// insertvalue or extractvalue indices that identify a member, return
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/// the linearized index of the start of the member.
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///
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static unsigned ComputeLinearIndex(const TargetLowering &TLI, const Type *Ty,
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const unsigned *Indices,
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const unsigned *IndicesEnd,
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unsigned CurIndex = 0) {
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// Base case: We're done.
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if (Indices && Indices == IndicesEnd)
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return CurIndex;
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// Given a struct type, recursively traverse the elements.
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if (const StructType *STy = dyn_cast<StructType>(Ty)) {
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for (StructType::element_iterator EB = STy->element_begin(),
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EI = EB,
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EE = STy->element_end();
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EI != EE; ++EI) {
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if (Indices && *Indices == unsigned(EI - EB))
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return ComputeLinearIndex(TLI, *EI, Indices+1, IndicesEnd, CurIndex);
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CurIndex = ComputeLinearIndex(TLI, *EI, 0, 0, CurIndex);
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}
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}
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// Given an array type, recursively traverse the elements.
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else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
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const Type *EltTy = ATy->getElementType();
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for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i) {
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if (Indices && *Indices == i)
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return ComputeLinearIndex(TLI, EltTy, Indices+1, IndicesEnd, CurIndex);
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CurIndex = ComputeLinearIndex(TLI, EltTy, 0, 0, CurIndex);
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}
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}
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// We haven't found the type we're looking for, so keep searching.
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return CurIndex + 1;
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}
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/// ComputeValueVTs - Given an LLVM IR type, compute a sequence of
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/// MVTs that represent all the individual underlying
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/// non-aggregate types that comprise it.
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///
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/// If Offsets is non-null, it points to a vector to be filled in
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/// with the in-memory offsets of each of the individual values.
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///
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static void ComputeValueVTs(const TargetLowering &TLI, const Type *Ty,
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SmallVectorImpl<MVT> &ValueVTs,
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SmallVectorImpl<uint64_t> *Offsets = 0,
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uint64_t StartingOffset = 0) {
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// Given a struct type, recursively traverse the elements.
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if (const StructType *STy = dyn_cast<StructType>(Ty)) {
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const StructLayout *SL = TLI.getTargetData()->getStructLayout(STy);
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for (StructType::element_iterator EB = STy->element_begin(),
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EI = EB,
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EE = STy->element_end();
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EI != EE; ++EI)
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ComputeValueVTs(TLI, *EI, ValueVTs, Offsets,
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StartingOffset + SL->getElementOffset(EI - EB));
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return;
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}
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// Given an array type, recursively traverse the elements.
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if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
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const Type *EltTy = ATy->getElementType();
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uint64_t EltSize = TLI.getTargetData()->getABITypeSize(EltTy);
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for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
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ComputeValueVTs(TLI, EltTy, ValueVTs, Offsets,
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StartingOffset + i * EltSize);
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return;
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}
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// Base case: we can get an MVT for this LLVM IR type.
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ValueVTs.push_back(TLI.getValueType(Ty));
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if (Offsets)
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Offsets->push_back(StartingOffset);
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}
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namespace {
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/// RegsForValue - This struct represents the registers (physical or virtual)
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/// that a particular set of values is assigned, and the type information about
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/// the value. The most common situation is to represent one value at a time,
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/// but struct or array values are handled element-wise as multiple values.
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/// The splitting of aggregates is performed recursively, so that we never
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/// have aggregate-typed registers. The values at this point do not necessarily
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/// have legal types, so each value may require one or more registers of some
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/// legal type.
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///
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struct VISIBILITY_HIDDEN RegsForValue {
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/// TLI - The TargetLowering object.
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///
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const TargetLowering *TLI;
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/// ValueVTs - The value types of the values, which may not be legal, and
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/// may need be promoted or synthesized from one or more registers.
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///
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SmallVector<MVT, 4> ValueVTs;
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/// RegVTs - The value types of the registers. This is the same size as
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/// ValueVTs and it records, for each value, what the type of the assigned
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/// register or registers are. (Individual values are never synthesized
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/// from more than one type of register.)
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///
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/// With virtual registers, the contents of RegVTs is redundant with TLI's
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/// getRegisterType member function, however when with physical registers
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/// it is necessary to have a separate record of the types.
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///
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SmallVector<MVT, 4> RegVTs;
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/// Regs - This list holds the registers assigned to the values.
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/// Each legal or promoted value requires one register, and each
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/// expanded value requires multiple registers.
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///
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SmallVector<unsigned, 4> Regs;
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RegsForValue() : TLI(0) {}
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RegsForValue(const TargetLowering &tli,
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const SmallVector<unsigned, 4> ®s,
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MVT regvt, MVT valuevt)
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: TLI(&tli), ValueVTs(1, valuevt), RegVTs(1, regvt), Regs(regs) {}
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RegsForValue(const TargetLowering &tli,
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const SmallVector<unsigned, 4> ®s,
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const SmallVector<MVT, 4> ®vts,
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const SmallVector<MVT, 4> &valuevts)
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: TLI(&tli), ValueVTs(valuevts), RegVTs(regvts), Regs(regs) {}
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RegsForValue(const TargetLowering &tli,
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unsigned Reg, const Type *Ty) : TLI(&tli) {
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ComputeValueVTs(tli, Ty, ValueVTs);
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for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) {
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MVT ValueVT = ValueVTs[Value];
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unsigned NumRegs = TLI->getNumRegisters(ValueVT);
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MVT RegisterVT = TLI->getRegisterType(ValueVT);
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for (unsigned i = 0; i != NumRegs; ++i)
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Regs.push_back(Reg + i);
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RegVTs.push_back(RegisterVT);
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Reg += NumRegs;
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}
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}
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/// append - Add the specified values to this one.
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void append(const RegsForValue &RHS) {
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TLI = RHS.TLI;
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ValueVTs.append(RHS.ValueVTs.begin(), RHS.ValueVTs.end());
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RegVTs.append(RHS.RegVTs.begin(), RHS.RegVTs.end());
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Regs.append(RHS.Regs.begin(), RHS.Regs.end());
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}
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/// getCopyFromRegs - Emit a series of CopyFromReg nodes that copies from
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/// this value and returns the result as a ValueVTs value. This uses
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/// Chain/Flag as the input and updates them for the output Chain/Flag.
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/// If the Flag pointer is NULL, no flag is used.
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SDOperand getCopyFromRegs(SelectionDAG &DAG,
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SDOperand &Chain, SDOperand *Flag) const;
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/// getCopyToRegs - Emit a series of CopyToReg nodes that copies the
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/// specified value into the registers specified by this object. This uses
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/// Chain/Flag as the input and updates them for the output Chain/Flag.
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/// If the Flag pointer is NULL, no flag is used.
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void getCopyToRegs(SDOperand Val, SelectionDAG &DAG,
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SDOperand &Chain, SDOperand *Flag) const;
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/// AddInlineAsmOperands - Add this value to the specified inlineasm node
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/// operand list. This adds the code marker and includes the number of
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/// values added into it.
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void AddInlineAsmOperands(unsigned Code, SelectionDAG &DAG,
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std::vector<SDOperand> &Ops) const;
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};
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}
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namespace llvm {
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//===--------------------------------------------------------------------===//
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/// createDefaultScheduler - This creates an instruction scheduler appropriate
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/// for the target.
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ScheduleDAG* createDefaultScheduler(SelectionDAGISel *IS,
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SelectionDAG *DAG,
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MachineBasicBlock *BB,
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bool Fast) {
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TargetLowering &TLI = IS->getTargetLowering();
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if (TLI.getSchedulingPreference() == TargetLowering::SchedulingForLatency) {
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return createTDListDAGScheduler(IS, DAG, BB, Fast);
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} else {
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assert(TLI.getSchedulingPreference() ==
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TargetLowering::SchedulingForRegPressure && "Unknown sched type!");
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return createBURRListDAGScheduler(IS, DAG, BB, Fast);
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}
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}
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//===--------------------------------------------------------------------===//
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/// FunctionLoweringInfo - This contains information that is global to a
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/// function that is used when lowering a region of the function.
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class FunctionLoweringInfo {
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public:
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TargetLowering &TLI;
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Function &Fn;
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MachineFunction &MF;
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MachineRegisterInfo &RegInfo;
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FunctionLoweringInfo(TargetLowering &TLI, Function &Fn,MachineFunction &MF);
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/// MBBMap - A mapping from LLVM basic blocks to their machine code entry.
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std::map<const BasicBlock*, MachineBasicBlock *> MBBMap;
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/// ValueMap - Since we emit code for the function a basic block at a time,
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/// we must remember which virtual registers hold the values for
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/// cross-basic-block values.
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DenseMap<const Value*, unsigned> ValueMap;
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/// StaticAllocaMap - Keep track of frame indices for fixed sized allocas in
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/// the entry block. This allows the allocas to be efficiently referenced
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/// anywhere in the function.
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std::map<const AllocaInst*, int> StaticAllocaMap;
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#ifndef NDEBUG
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SmallSet<Instruction*, 8> CatchInfoLost;
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SmallSet<Instruction*, 8> CatchInfoFound;
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#endif
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unsigned MakeReg(MVT VT) {
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return RegInfo.createVirtualRegister(TLI.getRegClassFor(VT));
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}
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/// isExportedInst - Return true if the specified value is an instruction
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/// exported from its block.
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bool isExportedInst(const Value *V) {
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return ValueMap.count(V);
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}
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unsigned CreateRegForValue(const Value *V);
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unsigned InitializeRegForValue(const Value *V) {
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unsigned &R = ValueMap[V];
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assert(R == 0 && "Already initialized this value register!");
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return R = CreateRegForValue(V);
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}
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struct LiveOutInfo {
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unsigned NumSignBits;
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APInt KnownOne, KnownZero;
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LiveOutInfo() : NumSignBits(0) {}
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};
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/// LiveOutRegInfo - Information about live out vregs, indexed by their
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/// register number offset by 'FirstVirtualRegister'.
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std::vector<LiveOutInfo> LiveOutRegInfo;
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};
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}
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/// isSelector - Return true if this instruction is a call to the
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/// eh.selector intrinsic.
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static bool isSelector(Instruction *I) {
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if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
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return (II->getIntrinsicID() == Intrinsic::eh_selector_i32 ||
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II->getIntrinsicID() == Intrinsic::eh_selector_i64);
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return false;
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}
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/// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by
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/// PHI nodes or outside of the basic block that defines it, or used by a
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/// switch or atomic instruction, which may expand to multiple basic blocks.
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static bool isUsedOutsideOfDefiningBlock(Instruction *I) {
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if (isa<PHINode>(I)) return true;
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BasicBlock *BB = I->getParent();
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for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; ++UI)
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if (cast<Instruction>(*UI)->getParent() != BB || isa<PHINode>(*UI) ||
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// FIXME: Remove switchinst special case.
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isa<SwitchInst>(*UI))
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return true;
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return false;
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}
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/// isOnlyUsedInEntryBlock - If the specified argument is only used in the
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/// entry block, return true. This includes arguments used by switches, since
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/// the switch may expand into multiple basic blocks.
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static bool isOnlyUsedInEntryBlock(Argument *A) {
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BasicBlock *Entry = A->getParent()->begin();
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for (Value::use_iterator UI = A->use_begin(), E = A->use_end(); UI != E; ++UI)
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if (cast<Instruction>(*UI)->getParent() != Entry || isa<SwitchInst>(*UI))
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return false; // Use not in entry block.
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return true;
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}
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FunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli,
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Function &fn, MachineFunction &mf)
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: TLI(tli), Fn(fn), MF(mf), RegInfo(MF.getRegInfo()) {
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// Create a vreg for each argument register that is not dead and is used
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// outside of the entry block for the function.
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for (Function::arg_iterator AI = Fn.arg_begin(), E = Fn.arg_end();
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AI != E; ++AI)
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if (!isOnlyUsedInEntryBlock(AI))
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InitializeRegForValue(AI);
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// Initialize the mapping of values to registers. This is only set up for
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// instruction values that are used outside of the block that defines
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// them.
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Function::iterator BB = Fn.begin(), EB = Fn.end();
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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if (AllocaInst *AI = dyn_cast<AllocaInst>(I))
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if (ConstantInt *CUI = dyn_cast<ConstantInt>(AI->getArraySize())) {
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const Type *Ty = AI->getAllocatedType();
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uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
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unsigned Align =
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std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty),
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AI->getAlignment());
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TySize *= CUI->getZExtValue(); // Get total allocated size.
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if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects.
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StaticAllocaMap[AI] =
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MF.getFrameInfo()->CreateStackObject(TySize, Align);
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}
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for (; BB != EB; ++BB)
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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if (!I->use_empty() && isUsedOutsideOfDefiningBlock(I))
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if (!isa<AllocaInst>(I) ||
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!StaticAllocaMap.count(cast<AllocaInst>(I)))
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InitializeRegForValue(I);
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// Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This
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// also creates the initial PHI MachineInstrs, though none of the input
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// operands are populated.
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for (BB = Fn.begin(), EB = Fn.end(); BB != EB; ++BB) {
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MachineBasicBlock *MBB = mf.CreateMachineBasicBlock(BB);
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MBBMap[BB] = MBB;
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MF.push_back(MBB);
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// Create Machine PHI nodes for LLVM PHI nodes, lowering them as
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// appropriate.
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PHINode *PN;
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for (BasicBlock::iterator I = BB->begin();(PN = dyn_cast<PHINode>(I)); ++I){
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if (PN->use_empty()) continue;
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MVT VT = TLI.getValueType(PN->getType());
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unsigned NumRegisters = TLI.getNumRegisters(VT);
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unsigned PHIReg = ValueMap[PN];
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assert(PHIReg && "PHI node does not have an assigned virtual register!");
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const TargetInstrInfo *TII = TLI.getTargetMachine().getInstrInfo();
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for (unsigned i = 0; i != NumRegisters; ++i)
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BuildMI(MBB, TII->get(TargetInstrInfo::PHI), PHIReg+i);
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}
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}
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}
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/// CreateRegForValue - Allocate the appropriate number of virtual registers of
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/// the correctly promoted or expanded types. Assign these registers
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/// consecutive vreg numbers and return the first assigned number.
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///
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/// In the case that the given value has struct or array type, this function
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/// will assign registers for each member or element.
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///
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|
unsigned FunctionLoweringInfo::CreateRegForValue(const Value *V) {
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
ComputeValueVTs(TLI, V->getType(), ValueVTs);
|
|
|
|
unsigned FirstReg = 0;
|
|
for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) {
|
|
MVT ValueVT = ValueVTs[Value];
|
|
MVT RegisterVT = TLI.getRegisterType(ValueVT);
|
|
|
|
unsigned NumRegs = TLI.getNumRegisters(ValueVT);
|
|
for (unsigned i = 0; i != NumRegs; ++i) {
|
|
unsigned R = MakeReg(RegisterVT);
|
|
if (!FirstReg) FirstReg = R;
|
|
}
|
|
}
|
|
return FirstReg;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// SelectionDAGLowering - This is the common target-independent lowering
|
|
/// implementation that is parameterized by a TargetLowering object.
|
|
/// Also, targets can overload any lowering method.
|
|
///
|
|
namespace llvm {
|
|
class SelectionDAGLowering {
|
|
MachineBasicBlock *CurMBB;
|
|
|
|
DenseMap<const Value*, SDOperand> NodeMap;
|
|
|
|
/// PendingLoads - Loads are not emitted to the program immediately. We bunch
|
|
/// them up and then emit token factor nodes when possible. This allows us to
|
|
/// get simple disambiguation between loads without worrying about alias
|
|
/// analysis.
|
|
SmallVector<SDOperand, 8> PendingLoads;
|
|
|
|
/// PendingExports - CopyToReg nodes that copy values to virtual registers
|
|
/// for export to other blocks need to be emitted before any terminator
|
|
/// instruction, but they have no other ordering requirements. We bunch them
|
|
/// up and the emit a single tokenfactor for them just before terminator
|
|
/// instructions.
|
|
std::vector<SDOperand> PendingExports;
|
|
|
|
/// Case - A struct to record the Value for a switch case, and the
|
|
/// case's target basic block.
|
|
struct Case {
|
|
Constant* Low;
|
|
Constant* High;
|
|
MachineBasicBlock* BB;
|
|
|
|
Case() : Low(0), High(0), BB(0) { }
|
|
Case(Constant* low, Constant* high, MachineBasicBlock* bb) :
|
|
Low(low), High(high), BB(bb) { }
|
|
uint64_t size() const {
|
|
uint64_t rHigh = cast<ConstantInt>(High)->getSExtValue();
|
|
uint64_t rLow = cast<ConstantInt>(Low)->getSExtValue();
|
|
return (rHigh - rLow + 1ULL);
|
|
}
|
|
};
|
|
|
|
struct CaseBits {
|
|
uint64_t Mask;
|
|
MachineBasicBlock* BB;
|
|
unsigned Bits;
|
|
|
|
CaseBits(uint64_t mask, MachineBasicBlock* bb, unsigned bits):
|
|
Mask(mask), BB(bb), Bits(bits) { }
|
|
};
|
|
|
|
typedef std::vector<Case> CaseVector;
|
|
typedef std::vector<CaseBits> CaseBitsVector;
|
|
typedef CaseVector::iterator CaseItr;
|
|
typedef std::pair<CaseItr, CaseItr> CaseRange;
|
|
|
|
/// CaseRec - A struct with ctor used in lowering switches to a binary tree
|
|
/// of conditional branches.
|
|
struct CaseRec {
|
|
CaseRec(MachineBasicBlock *bb, Constant *lt, Constant *ge, CaseRange r) :
|
|
CaseBB(bb), LT(lt), GE(ge), Range(r) {}
|
|
|
|
/// CaseBB - The MBB in which to emit the compare and branch
|
|
MachineBasicBlock *CaseBB;
|
|
/// LT, GE - If nonzero, we know the current case value must be less-than or
|
|
/// greater-than-or-equal-to these Constants.
|
|
Constant *LT;
|
|
Constant *GE;
|
|
/// Range - A pair of iterators representing the range of case values to be
|
|
/// processed at this point in the binary search tree.
|
|
CaseRange Range;
|
|
};
|
|
|
|
typedef std::vector<CaseRec> CaseRecVector;
|
|
|
|
/// The comparison function for sorting the switch case values in the vector.
|
|
/// WARNING: Case ranges should be disjoint!
|
|
struct CaseCmp {
|
|
bool operator () (const Case& C1, const Case& C2) {
|
|
assert(isa<ConstantInt>(C1.Low) && isa<ConstantInt>(C2.High));
|
|
const ConstantInt* CI1 = cast<const ConstantInt>(C1.Low);
|
|
const ConstantInt* CI2 = cast<const ConstantInt>(C2.High);
|
|
return CI1->getValue().slt(CI2->getValue());
|
|
}
|
|
};
|
|
|
|
struct CaseBitsCmp {
|
|
bool operator () (const CaseBits& C1, const CaseBits& C2) {
|
|
return C1.Bits > C2.Bits;
|
|
}
|
|
};
|
|
|
|
unsigned Clusterify(CaseVector& Cases, const SwitchInst &SI);
|
|
|
|
public:
|
|
// TLI - This is information that describes the available target features we
|
|
// need for lowering. This indicates when operations are unavailable,
|
|
// implemented with a libcall, etc.
|
|
TargetLowering &TLI;
|
|
SelectionDAG &DAG;
|
|
const TargetData *TD;
|
|
AliasAnalysis &AA;
|
|
|
|
/// SwitchCases - Vector of CaseBlock structures used to communicate
|
|
/// SwitchInst code generation information.
|
|
std::vector<SelectionDAGISel::CaseBlock> SwitchCases;
|
|
/// JTCases - Vector of JumpTable structures used to communicate
|
|
/// SwitchInst code generation information.
|
|
std::vector<SelectionDAGISel::JumpTableBlock> JTCases;
|
|
std::vector<SelectionDAGISel::BitTestBlock> BitTestCases;
|
|
|
|
/// FuncInfo - Information about the function as a whole.
|
|
///
|
|
FunctionLoweringInfo &FuncInfo;
|
|
|
|
/// GCI - Garbage collection metadata for the function.
|
|
CollectorMetadata *GCI;
|
|
|
|
SelectionDAGLowering(SelectionDAG &dag, TargetLowering &tli,
|
|
AliasAnalysis &aa,
|
|
FunctionLoweringInfo &funcinfo,
|
|
CollectorMetadata *gci)
|
|
: TLI(tli), DAG(dag), TD(DAG.getTarget().getTargetData()), AA(aa),
|
|
FuncInfo(funcinfo), GCI(gci) {
|
|
}
|
|
|
|
/// getRoot - Return the current virtual root of the Selection DAG,
|
|
/// flushing any PendingLoad items. This must be done before emitting
|
|
/// a store or any other node that may need to be ordered after any
|
|
/// prior load instructions.
|
|
///
|
|
SDOperand getRoot() {
|
|
if (PendingLoads.empty())
|
|
return DAG.getRoot();
|
|
|
|
if (PendingLoads.size() == 1) {
|
|
SDOperand Root = PendingLoads[0];
|
|
DAG.setRoot(Root);
|
|
PendingLoads.clear();
|
|
return Root;
|
|
}
|
|
|
|
// Otherwise, we have to make a token factor node.
|
|
SDOperand Root = DAG.getNode(ISD::TokenFactor, MVT::Other,
|
|
&PendingLoads[0], PendingLoads.size());
|
|
PendingLoads.clear();
|
|
DAG.setRoot(Root);
|
|
return Root;
|
|
}
|
|
|
|
/// getControlRoot - Similar to getRoot, but instead of flushing all the
|
|
/// PendingLoad items, flush all the PendingExports items. It is necessary
|
|
/// to do this before emitting a terminator instruction.
|
|
///
|
|
SDOperand getControlRoot() {
|
|
SDOperand Root = DAG.getRoot();
|
|
|
|
if (PendingExports.empty())
|
|
return Root;
|
|
|
|
// Turn all of the CopyToReg chains into one factored node.
|
|
if (Root.getOpcode() != ISD::EntryToken) {
|
|
unsigned i = 0, e = PendingExports.size();
|
|
for (; i != e; ++i) {
|
|
assert(PendingExports[i].Val->getNumOperands() > 1);
|
|
if (PendingExports[i].Val->getOperand(0) == Root)
|
|
break; // Don't add the root if we already indirectly depend on it.
|
|
}
|
|
|
|
if (i == e)
|
|
PendingExports.push_back(Root);
|
|
}
|
|
|
|
Root = DAG.getNode(ISD::TokenFactor, MVT::Other,
|
|
&PendingExports[0],
|
|
PendingExports.size());
|
|
PendingExports.clear();
|
|
DAG.setRoot(Root);
|
|
return Root;
|
|
}
|
|
|
|
void CopyValueToVirtualRegister(Value *V, unsigned Reg);
|
|
|
|
void visit(Instruction &I) { visit(I.getOpcode(), I); }
|
|
|
|
void visit(unsigned Opcode, User &I) {
|
|
// Note: this doesn't use InstVisitor, because it has to work with
|
|
// ConstantExpr's in addition to instructions.
|
|
switch (Opcode) {
|
|
default: assert(0 && "Unknown instruction type encountered!");
|
|
abort();
|
|
// Build the switch statement using the Instruction.def file.
|
|
#define HANDLE_INST(NUM, OPCODE, CLASS) \
|
|
case Instruction::OPCODE:return visit##OPCODE((CLASS&)I);
|
|
#include "llvm/Instruction.def"
|
|
}
|
|
}
|
|
|
|
void setCurrentBasicBlock(MachineBasicBlock *MBB) { CurMBB = MBB; }
|
|
|
|
SDOperand getValue(const Value *V);
|
|
|
|
void setValue(const Value *V, SDOperand NewN) {
|
|
SDOperand &N = NodeMap[V];
|
|
assert(N.Val == 0 && "Already set a value for this node!");
|
|
N = NewN;
|
|
}
|
|
|
|
void GetRegistersForValue(SDISelAsmOperandInfo &OpInfo, bool HasEarlyClobber,
|
|
std::set<unsigned> &OutputRegs,
|
|
std::set<unsigned> &InputRegs);
|
|
|
|
void FindMergedConditions(Value *Cond, MachineBasicBlock *TBB,
|
|
MachineBasicBlock *FBB, MachineBasicBlock *CurBB,
|
|
unsigned Opc);
|
|
bool isExportableFromCurrentBlock(Value *V, const BasicBlock *FromBB);
|
|
void ExportFromCurrentBlock(Value *V);
|
|
void LowerCallTo(CallSite CS, SDOperand Callee, bool IsTailCall,
|
|
MachineBasicBlock *LandingPad = NULL);
|
|
|
|
// Terminator instructions.
|
|
void visitRet(ReturnInst &I);
|
|
void visitBr(BranchInst &I);
|
|
void visitSwitch(SwitchInst &I);
|
|
void visitUnreachable(UnreachableInst &I) { /* noop */ }
|
|
|
|
// Helpers for visitSwitch
|
|
bool handleSmallSwitchRange(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default);
|
|
bool handleJTSwitchCase(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default);
|
|
bool handleBTSplitSwitchCase(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default);
|
|
bool handleBitTestsSwitchCase(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default);
|
|
void visitSwitchCase(SelectionDAGISel::CaseBlock &CB);
|
|
void visitBitTestHeader(SelectionDAGISel::BitTestBlock &B);
|
|
void visitBitTestCase(MachineBasicBlock* NextMBB,
|
|
unsigned Reg,
|
|
SelectionDAGISel::BitTestCase &B);
|
|
void visitJumpTable(SelectionDAGISel::JumpTable &JT);
|
|
void visitJumpTableHeader(SelectionDAGISel::JumpTable &JT,
|
|
SelectionDAGISel::JumpTableHeader &JTH);
|
|
|
|
// These all get lowered before this pass.
|
|
void visitInvoke(InvokeInst &I);
|
|
void visitUnwind(UnwindInst &I);
|
|
|
|
void visitBinary(User &I, unsigned OpCode);
|
|
void visitShift(User &I, unsigned Opcode);
|
|
void visitAdd(User &I) {
|
|
if (I.getType()->isFPOrFPVector())
|
|
visitBinary(I, ISD::FADD);
|
|
else
|
|
visitBinary(I, ISD::ADD);
|
|
}
|
|
void visitSub(User &I);
|
|
void visitMul(User &I) {
|
|
if (I.getType()->isFPOrFPVector())
|
|
visitBinary(I, ISD::FMUL);
|
|
else
|
|
visitBinary(I, ISD::MUL);
|
|
}
|
|
void visitURem(User &I) { visitBinary(I, ISD::UREM); }
|
|
void visitSRem(User &I) { visitBinary(I, ISD::SREM); }
|
|
void visitFRem(User &I) { visitBinary(I, ISD::FREM); }
|
|
void visitUDiv(User &I) { visitBinary(I, ISD::UDIV); }
|
|
void visitSDiv(User &I) { visitBinary(I, ISD::SDIV); }
|
|
void visitFDiv(User &I) { visitBinary(I, ISD::FDIV); }
|
|
void visitAnd (User &I) { visitBinary(I, ISD::AND); }
|
|
void visitOr (User &I) { visitBinary(I, ISD::OR); }
|
|
void visitXor (User &I) { visitBinary(I, ISD::XOR); }
|
|
void visitShl (User &I) { visitShift(I, ISD::SHL); }
|
|
void visitLShr(User &I) { visitShift(I, ISD::SRL); }
|
|
void visitAShr(User &I) { visitShift(I, ISD::SRA); }
|
|
void visitICmp(User &I);
|
|
void visitFCmp(User &I);
|
|
void visitVICmp(User &I);
|
|
void visitVFCmp(User &I);
|
|
// Visit the conversion instructions
|
|
void visitTrunc(User &I);
|
|
void visitZExt(User &I);
|
|
void visitSExt(User &I);
|
|
void visitFPTrunc(User &I);
|
|
void visitFPExt(User &I);
|
|
void visitFPToUI(User &I);
|
|
void visitFPToSI(User &I);
|
|
void visitUIToFP(User &I);
|
|
void visitSIToFP(User &I);
|
|
void visitPtrToInt(User &I);
|
|
void visitIntToPtr(User &I);
|
|
void visitBitCast(User &I);
|
|
|
|
void visitExtractElement(User &I);
|
|
void visitInsertElement(User &I);
|
|
void visitShuffleVector(User &I);
|
|
|
|
void visitExtractValue(ExtractValueInst &I);
|
|
void visitInsertValue(InsertValueInst &I);
|
|
|
|
void visitGetElementPtr(User &I);
|
|
void visitSelect(User &I);
|
|
|
|
void visitMalloc(MallocInst &I);
|
|
void visitFree(FreeInst &I);
|
|
void visitAlloca(AllocaInst &I);
|
|
void visitLoad(LoadInst &I);
|
|
void visitStore(StoreInst &I);
|
|
void visitPHI(PHINode &I) { } // PHI nodes are handled specially.
|
|
void visitCall(CallInst &I);
|
|
void visitInlineAsm(CallSite CS);
|
|
const char *visitIntrinsicCall(CallInst &I, unsigned Intrinsic);
|
|
void visitTargetIntrinsic(CallInst &I, unsigned Intrinsic);
|
|
|
|
void visitVAStart(CallInst &I);
|
|
void visitVAArg(VAArgInst &I);
|
|
void visitVAEnd(CallInst &I);
|
|
void visitVACopy(CallInst &I);
|
|
|
|
void visitGetResult(GetResultInst &I);
|
|
|
|
void visitUserOp1(Instruction &I) {
|
|
assert(0 && "UserOp1 should not exist at instruction selection time!");
|
|
abort();
|
|
}
|
|
void visitUserOp2(Instruction &I) {
|
|
assert(0 && "UserOp2 should not exist at instruction selection time!");
|
|
abort();
|
|
}
|
|
|
|
private:
|
|
inline const char *implVisitBinaryAtomic(CallInst& I, ISD::NodeType Op);
|
|
|
|
};
|
|
} // end namespace llvm
|
|
|
|
|
|
/// getCopyFromParts - Create a value that contains the specified legal parts
|
|
/// combined into the value they represent. If the parts combine to a type
|
|
/// larger then ValueVT then AssertOp can be used to specify whether the extra
|
|
/// bits are known to be zero (ISD::AssertZext) or sign extended from ValueVT
|
|
/// (ISD::AssertSext).
|
|
static SDOperand getCopyFromParts(SelectionDAG &DAG,
|
|
const SDOperand *Parts,
|
|
unsigned NumParts,
|
|
MVT PartVT,
|
|
MVT ValueVT,
|
|
ISD::NodeType AssertOp = ISD::DELETED_NODE) {
|
|
assert(NumParts > 0 && "No parts to assemble!");
|
|
TargetLowering &TLI = DAG.getTargetLoweringInfo();
|
|
SDOperand Val = Parts[0];
|
|
|
|
if (NumParts > 1) {
|
|
// Assemble the value from multiple parts.
|
|
if (!ValueVT.isVector()) {
|
|
unsigned PartBits = PartVT.getSizeInBits();
|
|
unsigned ValueBits = ValueVT.getSizeInBits();
|
|
|
|
// Assemble the power of 2 part.
|
|
unsigned RoundParts = NumParts & (NumParts - 1) ?
|
|
1 << Log2_32(NumParts) : NumParts;
|
|
unsigned RoundBits = PartBits * RoundParts;
|
|
MVT RoundVT = RoundBits == ValueBits ?
|
|
ValueVT : MVT::getIntegerVT(RoundBits);
|
|
SDOperand Lo, Hi;
|
|
|
|
if (RoundParts > 2) {
|
|
MVT HalfVT = MVT::getIntegerVT(RoundBits/2);
|
|
Lo = getCopyFromParts(DAG, Parts, RoundParts/2, PartVT, HalfVT);
|
|
Hi = getCopyFromParts(DAG, Parts+RoundParts/2, RoundParts/2,
|
|
PartVT, HalfVT);
|
|
} else {
|
|
Lo = Parts[0];
|
|
Hi = Parts[1];
|
|
}
|
|
if (TLI.isBigEndian())
|
|
std::swap(Lo, Hi);
|
|
Val = DAG.getNode(ISD::BUILD_PAIR, RoundVT, Lo, Hi);
|
|
|
|
if (RoundParts < NumParts) {
|
|
// Assemble the trailing non-power-of-2 part.
|
|
unsigned OddParts = NumParts - RoundParts;
|
|
MVT OddVT = MVT::getIntegerVT(OddParts * PartBits);
|
|
Hi = getCopyFromParts(DAG, Parts+RoundParts, OddParts, PartVT, OddVT);
|
|
|
|
// Combine the round and odd parts.
|
|
Lo = Val;
|
|
if (TLI.isBigEndian())
|
|
std::swap(Lo, Hi);
|
|
MVT TotalVT = MVT::getIntegerVT(NumParts * PartBits);
|
|
Hi = DAG.getNode(ISD::ANY_EXTEND, TotalVT, Hi);
|
|
Hi = DAG.getNode(ISD::SHL, TotalVT, Hi,
|
|
DAG.getConstant(Lo.getValueType().getSizeInBits(),
|
|
TLI.getShiftAmountTy()));
|
|
Lo = DAG.getNode(ISD::ZERO_EXTEND, TotalVT, Lo);
|
|
Val = DAG.getNode(ISD::OR, TotalVT, Lo, Hi);
|
|
}
|
|
} else {
|
|
// Handle a multi-element vector.
|
|
MVT IntermediateVT, RegisterVT;
|
|
unsigned NumIntermediates;
|
|
unsigned NumRegs =
|
|
TLI.getVectorTypeBreakdown(ValueVT, IntermediateVT, NumIntermediates,
|
|
RegisterVT);
|
|
assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!");
|
|
NumParts = NumRegs; // Silence a compiler warning.
|
|
assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!");
|
|
assert(RegisterVT == Parts[0].getValueType() &&
|
|
"Part type doesn't match part!");
|
|
|
|
// Assemble the parts into intermediate operands.
|
|
SmallVector<SDOperand, 8> Ops(NumIntermediates);
|
|
if (NumIntermediates == NumParts) {
|
|
// If the register was not expanded, truncate or copy the value,
|
|
// as appropriate.
|
|
for (unsigned i = 0; i != NumParts; ++i)
|
|
Ops[i] = getCopyFromParts(DAG, &Parts[i], 1,
|
|
PartVT, IntermediateVT);
|
|
} else if (NumParts > 0) {
|
|
// If the intermediate type was expanded, build the intermediate operands
|
|
// from the parts.
|
|
assert(NumParts % NumIntermediates == 0 &&
|
|
"Must expand into a divisible number of parts!");
|
|
unsigned Factor = NumParts / NumIntermediates;
|
|
for (unsigned i = 0; i != NumIntermediates; ++i)
|
|
Ops[i] = getCopyFromParts(DAG, &Parts[i * Factor], Factor,
|
|
PartVT, IntermediateVT);
|
|
}
|
|
|
|
// Build a vector with BUILD_VECTOR or CONCAT_VECTORS from the intermediate
|
|
// operands.
|
|
Val = DAG.getNode(IntermediateVT.isVector() ?
|
|
ISD::CONCAT_VECTORS : ISD::BUILD_VECTOR,
|
|
ValueVT, &Ops[0], NumIntermediates);
|
|
}
|
|
}
|
|
|
|
// There is now one part, held in Val. Correct it to match ValueVT.
|
|
PartVT = Val.getValueType();
|
|
|
|
if (PartVT == ValueVT)
|
|
return Val;
|
|
|
|
if (PartVT.isVector()) {
|
|
assert(ValueVT.isVector() && "Unknown vector conversion!");
|
|
return DAG.getNode(ISD::BIT_CONVERT, ValueVT, Val);
|
|
}
|
|
|
|
if (ValueVT.isVector()) {
|
|
assert(ValueVT.getVectorElementType() == PartVT &&
|
|
ValueVT.getVectorNumElements() == 1 &&
|
|
"Only trivial scalar-to-vector conversions should get here!");
|
|
return DAG.getNode(ISD::BUILD_VECTOR, ValueVT, Val);
|
|
}
|
|
|
|
if (PartVT.isInteger() &&
|
|
ValueVT.isInteger()) {
|
|
if (ValueVT.bitsLT(PartVT)) {
|
|
// For a truncate, see if we have any information to
|
|
// indicate whether the truncated bits will always be
|
|
// zero or sign-extension.
|
|
if (AssertOp != ISD::DELETED_NODE)
|
|
Val = DAG.getNode(AssertOp, PartVT, Val,
|
|
DAG.getValueType(ValueVT));
|
|
return DAG.getNode(ISD::TRUNCATE, ValueVT, Val);
|
|
} else {
|
|
return DAG.getNode(ISD::ANY_EXTEND, ValueVT, Val);
|
|
}
|
|
}
|
|
|
|
if (PartVT.isFloatingPoint() && ValueVT.isFloatingPoint()) {
|
|
if (ValueVT.bitsLT(Val.getValueType()))
|
|
// FP_ROUND's are always exact here.
|
|
return DAG.getNode(ISD::FP_ROUND, ValueVT, Val,
|
|
DAG.getIntPtrConstant(1));
|
|
return DAG.getNode(ISD::FP_EXTEND, ValueVT, Val);
|
|
}
|
|
|
|
if (PartVT.getSizeInBits() == ValueVT.getSizeInBits())
|
|
return DAG.getNode(ISD::BIT_CONVERT, ValueVT, Val);
|
|
|
|
assert(0 && "Unknown mismatch!");
|
|
return SDOperand();
|
|
}
|
|
|
|
/// getCopyToParts - Create a series of nodes that contain the specified value
|
|
/// split into legal parts. If the parts contain more bits than Val, then, for
|
|
/// integers, ExtendKind can be used to specify how to generate the extra bits.
|
|
static void getCopyToParts(SelectionDAG &DAG,
|
|
SDOperand Val,
|
|
SDOperand *Parts,
|
|
unsigned NumParts,
|
|
MVT PartVT,
|
|
ISD::NodeType ExtendKind = ISD::ANY_EXTEND) {
|
|
TargetLowering &TLI = DAG.getTargetLoweringInfo();
|
|
MVT PtrVT = TLI.getPointerTy();
|
|
MVT ValueVT = Val.getValueType();
|
|
unsigned PartBits = PartVT.getSizeInBits();
|
|
assert(TLI.isTypeLegal(PartVT) && "Copying to an illegal type!");
|
|
|
|
if (!NumParts)
|
|
return;
|
|
|
|
if (!ValueVT.isVector()) {
|
|
if (PartVT == ValueVT) {
|
|
assert(NumParts == 1 && "No-op copy with multiple parts!");
|
|
Parts[0] = Val;
|
|
return;
|
|
}
|
|
|
|
if (NumParts * PartBits > ValueVT.getSizeInBits()) {
|
|
// If the parts cover more bits than the value has, promote the value.
|
|
if (PartVT.isFloatingPoint() && ValueVT.isFloatingPoint()) {
|
|
assert(NumParts == 1 && "Do not know what to promote to!");
|
|
Val = DAG.getNode(ISD::FP_EXTEND, PartVT, Val);
|
|
} else if (PartVT.isInteger() && ValueVT.isInteger()) {
|
|
ValueVT = MVT::getIntegerVT(NumParts * PartBits);
|
|
Val = DAG.getNode(ExtendKind, ValueVT, Val);
|
|
} else {
|
|
assert(0 && "Unknown mismatch!");
|
|
}
|
|
} else if (PartBits == ValueVT.getSizeInBits()) {
|
|
// Different types of the same size.
|
|
assert(NumParts == 1 && PartVT != ValueVT);
|
|
Val = DAG.getNode(ISD::BIT_CONVERT, PartVT, Val);
|
|
} else if (NumParts * PartBits < ValueVT.getSizeInBits()) {
|
|
// If the parts cover less bits than value has, truncate the value.
|
|
if (PartVT.isInteger() && ValueVT.isInteger()) {
|
|
ValueVT = MVT::getIntegerVT(NumParts * PartBits);
|
|
Val = DAG.getNode(ISD::TRUNCATE, ValueVT, Val);
|
|
} else {
|
|
assert(0 && "Unknown mismatch!");
|
|
}
|
|
}
|
|
|
|
// The value may have changed - recompute ValueVT.
|
|
ValueVT = Val.getValueType();
|
|
assert(NumParts * PartBits == ValueVT.getSizeInBits() &&
|
|
"Failed to tile the value with PartVT!");
|
|
|
|
if (NumParts == 1) {
|
|
assert(PartVT == ValueVT && "Type conversion failed!");
|
|
Parts[0] = Val;
|
|
return;
|
|
}
|
|
|
|
// Expand the value into multiple parts.
|
|
if (NumParts & (NumParts - 1)) {
|
|
// The number of parts is not a power of 2. Split off and copy the tail.
|
|
assert(PartVT.isInteger() && ValueVT.isInteger() &&
|
|
"Do not know what to expand to!");
|
|
unsigned RoundParts = 1 << Log2_32(NumParts);
|
|
unsigned RoundBits = RoundParts * PartBits;
|
|
unsigned OddParts = NumParts - RoundParts;
|
|
SDOperand OddVal = DAG.getNode(ISD::SRL, ValueVT, Val,
|
|
DAG.getConstant(RoundBits,
|
|
TLI.getShiftAmountTy()));
|
|
getCopyToParts(DAG, OddVal, Parts + RoundParts, OddParts, PartVT);
|
|
if (TLI.isBigEndian())
|
|
// The odd parts were reversed by getCopyToParts - unreverse them.
|
|
std::reverse(Parts + RoundParts, Parts + NumParts);
|
|
NumParts = RoundParts;
|
|
ValueVT = MVT::getIntegerVT(NumParts * PartBits);
|
|
Val = DAG.getNode(ISD::TRUNCATE, ValueVT, Val);
|
|
}
|
|
|
|
// The number of parts is a power of 2. Repeatedly bisect the value using
|
|
// EXTRACT_ELEMENT.
|
|
Parts[0] = DAG.getNode(ISD::BIT_CONVERT,
|
|
MVT::getIntegerVT(ValueVT.getSizeInBits()),
|
|
Val);
|
|
for (unsigned StepSize = NumParts; StepSize > 1; StepSize /= 2) {
|
|
for (unsigned i = 0; i < NumParts; i += StepSize) {
|
|
unsigned ThisBits = StepSize * PartBits / 2;
|
|
MVT ThisVT = MVT::getIntegerVT (ThisBits);
|
|
SDOperand &Part0 = Parts[i];
|
|
SDOperand &Part1 = Parts[i+StepSize/2];
|
|
|
|
Part1 = DAG.getNode(ISD::EXTRACT_ELEMENT, ThisVT, Part0,
|
|
DAG.getConstant(1, PtrVT));
|
|
Part0 = DAG.getNode(ISD::EXTRACT_ELEMENT, ThisVT, Part0,
|
|
DAG.getConstant(0, PtrVT));
|
|
|
|
if (ThisBits == PartBits && ThisVT != PartVT) {
|
|
Part0 = DAG.getNode(ISD::BIT_CONVERT, PartVT, Part0);
|
|
Part1 = DAG.getNode(ISD::BIT_CONVERT, PartVT, Part1);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (TLI.isBigEndian())
|
|
std::reverse(Parts, Parts + NumParts);
|
|
|
|
return;
|
|
}
|
|
|
|
// Vector ValueVT.
|
|
if (NumParts == 1) {
|
|
if (PartVT != ValueVT) {
|
|
if (PartVT.isVector()) {
|
|
Val = DAG.getNode(ISD::BIT_CONVERT, PartVT, Val);
|
|
} else {
|
|
assert(ValueVT.getVectorElementType() == PartVT &&
|
|
ValueVT.getVectorNumElements() == 1 &&
|
|
"Only trivial vector-to-scalar conversions should get here!");
|
|
Val = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, PartVT, Val,
|
|
DAG.getConstant(0, PtrVT));
|
|
}
|
|
}
|
|
|
|
Parts[0] = Val;
|
|
return;
|
|
}
|
|
|
|
// Handle a multi-element vector.
|
|
MVT IntermediateVT, RegisterVT;
|
|
unsigned NumIntermediates;
|
|
unsigned NumRegs =
|
|
DAG.getTargetLoweringInfo()
|
|
.getVectorTypeBreakdown(ValueVT, IntermediateVT, NumIntermediates,
|
|
RegisterVT);
|
|
unsigned NumElements = ValueVT.getVectorNumElements();
|
|
|
|
assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!");
|
|
NumParts = NumRegs; // Silence a compiler warning.
|
|
assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!");
|
|
|
|
// Split the vector into intermediate operands.
|
|
SmallVector<SDOperand, 8> Ops(NumIntermediates);
|
|
for (unsigned i = 0; i != NumIntermediates; ++i)
|
|
if (IntermediateVT.isVector())
|
|
Ops[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR,
|
|
IntermediateVT, Val,
|
|
DAG.getConstant(i * (NumElements / NumIntermediates),
|
|
PtrVT));
|
|
else
|
|
Ops[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT,
|
|
IntermediateVT, Val,
|
|
DAG.getConstant(i, PtrVT));
|
|
|
|
// Split the intermediate operands into legal parts.
|
|
if (NumParts == NumIntermediates) {
|
|
// If the register was not expanded, promote or copy the value,
|
|
// as appropriate.
|
|
for (unsigned i = 0; i != NumParts; ++i)
|
|
getCopyToParts(DAG, Ops[i], &Parts[i], 1, PartVT);
|
|
} else if (NumParts > 0) {
|
|
// If the intermediate type was expanded, split each the value into
|
|
// legal parts.
|
|
assert(NumParts % NumIntermediates == 0 &&
|
|
"Must expand into a divisible number of parts!");
|
|
unsigned Factor = NumParts / NumIntermediates;
|
|
for (unsigned i = 0; i != NumIntermediates; ++i)
|
|
getCopyToParts(DAG, Ops[i], &Parts[i * Factor], Factor, PartVT);
|
|
}
|
|
}
|
|
|
|
|
|
SDOperand SelectionDAGLowering::getValue(const Value *V) {
|
|
SDOperand &N = NodeMap[V];
|
|
if (N.Val) return N;
|
|
|
|
if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
|
|
MVT VT = TLI.getValueType(V->getType(), true);
|
|
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(C))
|
|
return N = DAG.getConstant(CI->getValue(), VT);
|
|
|
|
if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
|
|
return N = DAG.getGlobalAddress(GV, VT);
|
|
|
|
if (isa<ConstantPointerNull>(C))
|
|
return N = DAG.getConstant(0, TLI.getPointerTy());
|
|
|
|
if (ConstantFP *CFP = dyn_cast<ConstantFP>(C))
|
|
return N = DAG.getConstantFP(CFP->getValueAPF(), VT);
|
|
|
|
if (isa<UndefValue>(C) && !isa<VectorType>(V->getType()) &&
|
|
!V->getType()->isAggregateType())
|
|
return N = DAG.getNode(ISD::UNDEF, VT);
|
|
|
|
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
|
|
visit(CE->getOpcode(), *CE);
|
|
SDOperand N1 = NodeMap[V];
|
|
assert(N1.Val && "visit didn't populate the ValueMap!");
|
|
return N1;
|
|
}
|
|
|
|
if (isa<ConstantStruct>(C) || isa<ConstantArray>(C)) {
|
|
SmallVector<SDOperand, 4> Constants;
|
|
for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end();
|
|
OI != OE; ++OI) {
|
|
SDNode *Val = getValue(*OI).Val;
|
|
for (unsigned i = 0, e = Val->getNumValues(); i != e; ++i)
|
|
Constants.push_back(SDOperand(Val, i));
|
|
}
|
|
return DAG.getMergeValues(&Constants[0], Constants.size());
|
|
}
|
|
|
|
if (const ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
|
|
assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) &&
|
|
"Unknown array constant!");
|
|
unsigned NumElts = ATy->getNumElements();
|
|
if (NumElts == 0)
|
|
return SDOperand(); // empty array
|
|
MVT EltVT = TLI.getValueType(ATy->getElementType());
|
|
SmallVector<SDOperand, 4> Constants(NumElts);
|
|
for (unsigned i = 0, e = NumElts; i != e; ++i) {
|
|
if (isa<UndefValue>(C))
|
|
Constants[i] = DAG.getNode(ISD::UNDEF, EltVT);
|
|
else if (EltVT.isFloatingPoint())
|
|
Constants[i] = DAG.getConstantFP(0, EltVT);
|
|
else
|
|
Constants[i] = DAG.getConstant(0, EltVT);
|
|
}
|
|
return DAG.getMergeValues(&Constants[0], Constants.size());
|
|
}
|
|
|
|
if (const StructType *STy = dyn_cast<StructType>(C->getType())) {
|
|
assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) &&
|
|
"Unknown struct constant!");
|
|
unsigned NumElts = STy->getNumElements();
|
|
if (NumElts == 0)
|
|
return SDOperand(); // empty struct
|
|
SmallVector<SDOperand, 4> Constants(NumElts);
|
|
for (unsigned i = 0, e = NumElts; i != e; ++i) {
|
|
MVT EltVT = TLI.getValueType(STy->getElementType(i));
|
|
if (isa<UndefValue>(C))
|
|
Constants[i] = DAG.getNode(ISD::UNDEF, EltVT);
|
|
else if (EltVT.isFloatingPoint())
|
|
Constants[i] = DAG.getConstantFP(0, EltVT);
|
|
else
|
|
Constants[i] = DAG.getConstant(0, EltVT);
|
|
}
|
|
return DAG.getMergeValues(&Constants[0], Constants.size());
|
|
}
|
|
|
|
const VectorType *VecTy = cast<VectorType>(V->getType());
|
|
unsigned NumElements = VecTy->getNumElements();
|
|
|
|
// Now that we know the number and type of the elements, get that number of
|
|
// elements into the Ops array based on what kind of constant it is.
|
|
SmallVector<SDOperand, 16> Ops;
|
|
if (ConstantVector *CP = dyn_cast<ConstantVector>(C)) {
|
|
for (unsigned i = 0; i != NumElements; ++i)
|
|
Ops.push_back(getValue(CP->getOperand(i)));
|
|
} else {
|
|
assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) &&
|
|
"Unknown vector constant!");
|
|
MVT EltVT = TLI.getValueType(VecTy->getElementType());
|
|
|
|
SDOperand Op;
|
|
if (isa<UndefValue>(C))
|
|
Op = DAG.getNode(ISD::UNDEF, EltVT);
|
|
else if (EltVT.isFloatingPoint())
|
|
Op = DAG.getConstantFP(0, EltVT);
|
|
else
|
|
Op = DAG.getConstant(0, EltVT);
|
|
Ops.assign(NumElements, Op);
|
|
}
|
|
|
|
// Create a BUILD_VECTOR node.
|
|
return NodeMap[V] = DAG.getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
|
|
}
|
|
|
|
// If this is a static alloca, generate it as the frameindex instead of
|
|
// computation.
|
|
if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) {
|
|
std::map<const AllocaInst*, int>::iterator SI =
|
|
FuncInfo.StaticAllocaMap.find(AI);
|
|
if (SI != FuncInfo.StaticAllocaMap.end())
|
|
return DAG.getFrameIndex(SI->second, TLI.getPointerTy());
|
|
}
|
|
|
|
unsigned InReg = FuncInfo.ValueMap[V];
|
|
assert(InReg && "Value not in map!");
|
|
|
|
RegsForValue RFV(TLI, InReg, V->getType());
|
|
SDOperand Chain = DAG.getEntryNode();
|
|
return RFV.getCopyFromRegs(DAG, Chain, NULL);
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitRet(ReturnInst &I) {
|
|
if (I.getNumOperands() == 0) {
|
|
DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getControlRoot()));
|
|
return;
|
|
}
|
|
|
|
SmallVector<SDOperand, 8> NewValues;
|
|
NewValues.push_back(getControlRoot());
|
|
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
|
|
SDOperand RetOp = getValue(I.getOperand(i));
|
|
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
ComputeValueVTs(TLI, I.getOperand(i)->getType(), ValueVTs);
|
|
for (unsigned j = 0, f = ValueVTs.size(); j != f; ++j) {
|
|
MVT VT = ValueVTs[j];
|
|
|
|
// FIXME: C calling convention requires the return type to be promoted to
|
|
// at least 32-bit. But this is not necessary for non-C calling conventions.
|
|
if (VT.isInteger()) {
|
|
MVT MinVT = TLI.getRegisterType(MVT::i32);
|
|
if (VT.bitsLT(MinVT))
|
|
VT = MinVT;
|
|
}
|
|
|
|
unsigned NumParts = TLI.getNumRegisters(VT);
|
|
MVT PartVT = TLI.getRegisterType(VT);
|
|
SmallVector<SDOperand, 4> Parts(NumParts);
|
|
ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
|
|
|
|
const Function *F = I.getParent()->getParent();
|
|
if (F->paramHasAttr(0, ParamAttr::SExt))
|
|
ExtendKind = ISD::SIGN_EXTEND;
|
|
else if (F->paramHasAttr(0, ParamAttr::ZExt))
|
|
ExtendKind = ISD::ZERO_EXTEND;
|
|
|
|
getCopyToParts(DAG, SDOperand(RetOp.Val, RetOp.ResNo + j),
|
|
&Parts[0], NumParts, PartVT, ExtendKind);
|
|
|
|
for (unsigned i = 0; i < NumParts; ++i) {
|
|
NewValues.push_back(Parts[i]);
|
|
NewValues.push_back(DAG.getArgFlags(ISD::ArgFlagsTy()));
|
|
}
|
|
}
|
|
}
|
|
DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other,
|
|
&NewValues[0], NewValues.size()));
|
|
}
|
|
|
|
/// ExportFromCurrentBlock - If this condition isn't known to be exported from
|
|
/// the current basic block, add it to ValueMap now so that we'll get a
|
|
/// CopyTo/FromReg.
|
|
void SelectionDAGLowering::ExportFromCurrentBlock(Value *V) {
|
|
// No need to export constants.
|
|
if (!isa<Instruction>(V) && !isa<Argument>(V)) return;
|
|
|
|
// Already exported?
|
|
if (FuncInfo.isExportedInst(V)) return;
|
|
|
|
unsigned Reg = FuncInfo.InitializeRegForValue(V);
|
|
CopyValueToVirtualRegister(V, Reg);
|
|
}
|
|
|
|
bool SelectionDAGLowering::isExportableFromCurrentBlock(Value *V,
|
|
const BasicBlock *FromBB) {
|
|
// The operands of the setcc have to be in this block. We don't know
|
|
// how to export them from some other block.
|
|
if (Instruction *VI = dyn_cast<Instruction>(V)) {
|
|
// Can export from current BB.
|
|
if (VI->getParent() == FromBB)
|
|
return true;
|
|
|
|
// Is already exported, noop.
|
|
return FuncInfo.isExportedInst(V);
|
|
}
|
|
|
|
// If this is an argument, we can export it if the BB is the entry block or
|
|
// if it is already exported.
|
|
if (isa<Argument>(V)) {
|
|
if (FromBB == &FromBB->getParent()->getEntryBlock())
|
|
return true;
|
|
|
|
// Otherwise, can only export this if it is already exported.
|
|
return FuncInfo.isExportedInst(V);
|
|
}
|
|
|
|
// Otherwise, constants can always be exported.
|
|
return true;
|
|
}
|
|
|
|
static bool InBlock(const Value *V, const BasicBlock *BB) {
|
|
if (const Instruction *I = dyn_cast<Instruction>(V))
|
|
return I->getParent() == BB;
|
|
return true;
|
|
}
|
|
|
|
/// FindMergedConditions - If Cond is an expression like
|
|
void SelectionDAGLowering::FindMergedConditions(Value *Cond,
|
|
MachineBasicBlock *TBB,
|
|
MachineBasicBlock *FBB,
|
|
MachineBasicBlock *CurBB,
|
|
unsigned Opc) {
|
|
// If this node is not part of the or/and tree, emit it as a branch.
|
|
Instruction *BOp = dyn_cast<Instruction>(Cond);
|
|
|
|
if (!BOp || !(isa<BinaryOperator>(BOp) || isa<CmpInst>(BOp)) ||
|
|
(unsigned)BOp->getOpcode() != Opc || !BOp->hasOneUse() ||
|
|
BOp->getParent() != CurBB->getBasicBlock() ||
|
|
!InBlock(BOp->getOperand(0), CurBB->getBasicBlock()) ||
|
|
!InBlock(BOp->getOperand(1), CurBB->getBasicBlock())) {
|
|
const BasicBlock *BB = CurBB->getBasicBlock();
|
|
|
|
// If the leaf of the tree is a comparison, merge the condition into
|
|
// the caseblock.
|
|
if ((isa<ICmpInst>(Cond) || isa<FCmpInst>(Cond)) &&
|
|
// The operands of the cmp have to be in this block. We don't know
|
|
// how to export them from some other block. If this is the first block
|
|
// of the sequence, no exporting is needed.
|
|
(CurBB == CurMBB ||
|
|
(isExportableFromCurrentBlock(BOp->getOperand(0), BB) &&
|
|
isExportableFromCurrentBlock(BOp->getOperand(1), BB)))) {
|
|
BOp = cast<Instruction>(Cond);
|
|
ISD::CondCode Condition;
|
|
if (ICmpInst *IC = dyn_cast<ICmpInst>(Cond)) {
|
|
switch (IC->getPredicate()) {
|
|
default: assert(0 && "Unknown icmp predicate opcode!");
|
|
case ICmpInst::ICMP_EQ: Condition = ISD::SETEQ; break;
|
|
case ICmpInst::ICMP_NE: Condition = ISD::SETNE; break;
|
|
case ICmpInst::ICMP_SLE: Condition = ISD::SETLE; break;
|
|
case ICmpInst::ICMP_ULE: Condition = ISD::SETULE; break;
|
|
case ICmpInst::ICMP_SGE: Condition = ISD::SETGE; break;
|
|
case ICmpInst::ICMP_UGE: Condition = ISD::SETUGE; break;
|
|
case ICmpInst::ICMP_SLT: Condition = ISD::SETLT; break;
|
|
case ICmpInst::ICMP_ULT: Condition = ISD::SETULT; break;
|
|
case ICmpInst::ICMP_SGT: Condition = ISD::SETGT; break;
|
|
case ICmpInst::ICMP_UGT: Condition = ISD::SETUGT; break;
|
|
}
|
|
} else if (FCmpInst *FC = dyn_cast<FCmpInst>(Cond)) {
|
|
ISD::CondCode FPC, FOC;
|
|
switch (FC->getPredicate()) {
|
|
default: assert(0 && "Unknown fcmp predicate opcode!");
|
|
case FCmpInst::FCMP_FALSE: FOC = FPC = ISD::SETFALSE; break;
|
|
case FCmpInst::FCMP_OEQ: FOC = ISD::SETEQ; FPC = ISD::SETOEQ; break;
|
|
case FCmpInst::FCMP_OGT: FOC = ISD::SETGT; FPC = ISD::SETOGT; break;
|
|
case FCmpInst::FCMP_OGE: FOC = ISD::SETGE; FPC = ISD::SETOGE; break;
|
|
case FCmpInst::FCMP_OLT: FOC = ISD::SETLT; FPC = ISD::SETOLT; break;
|
|
case FCmpInst::FCMP_OLE: FOC = ISD::SETLE; FPC = ISD::SETOLE; break;
|
|
case FCmpInst::FCMP_ONE: FOC = ISD::SETNE; FPC = ISD::SETONE; break;
|
|
case FCmpInst::FCMP_ORD: FOC = FPC = ISD::SETO; break;
|
|
case FCmpInst::FCMP_UNO: FOC = FPC = ISD::SETUO; break;
|
|
case FCmpInst::FCMP_UEQ: FOC = ISD::SETEQ; FPC = ISD::SETUEQ; break;
|
|
case FCmpInst::FCMP_UGT: FOC = ISD::SETGT; FPC = ISD::SETUGT; break;
|
|
case FCmpInst::FCMP_UGE: FOC = ISD::SETGE; FPC = ISD::SETUGE; break;
|
|
case FCmpInst::FCMP_ULT: FOC = ISD::SETLT; FPC = ISD::SETULT; break;
|
|
case FCmpInst::FCMP_ULE: FOC = ISD::SETLE; FPC = ISD::SETULE; break;
|
|
case FCmpInst::FCMP_UNE: FOC = ISD::SETNE; FPC = ISD::SETUNE; break;
|
|
case FCmpInst::FCMP_TRUE: FOC = FPC = ISD::SETTRUE; break;
|
|
}
|
|
if (FiniteOnlyFPMath())
|
|
Condition = FOC;
|
|
else
|
|
Condition = FPC;
|
|
} else {
|
|
Condition = ISD::SETEQ; // silence warning.
|
|
assert(0 && "Unknown compare instruction");
|
|
}
|
|
|
|
SelectionDAGISel::CaseBlock CB(Condition, BOp->getOperand(0),
|
|
BOp->getOperand(1), NULL, TBB, FBB, CurBB);
|
|
SwitchCases.push_back(CB);
|
|
return;
|
|
}
|
|
|
|
// Create a CaseBlock record representing this branch.
|
|
SelectionDAGISel::CaseBlock CB(ISD::SETEQ, Cond, ConstantInt::getTrue(),
|
|
NULL, TBB, FBB, CurBB);
|
|
SwitchCases.push_back(CB);
|
|
return;
|
|
}
|
|
|
|
|
|
// Create TmpBB after CurBB.
|
|
MachineFunction::iterator BBI = CurBB;
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
MachineBasicBlock *TmpBB = MF.CreateMachineBasicBlock(CurBB->getBasicBlock());
|
|
CurBB->getParent()->insert(++BBI, TmpBB);
|
|
|
|
if (Opc == Instruction::Or) {
|
|
// Codegen X | Y as:
|
|
// jmp_if_X TBB
|
|
// jmp TmpBB
|
|
// TmpBB:
|
|
// jmp_if_Y TBB
|
|
// jmp FBB
|
|
//
|
|
|
|
// Emit the LHS condition.
|
|
FindMergedConditions(BOp->getOperand(0), TBB, TmpBB, CurBB, Opc);
|
|
|
|
// Emit the RHS condition into TmpBB.
|
|
FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, Opc);
|
|
} else {
|
|
assert(Opc == Instruction::And && "Unknown merge op!");
|
|
// Codegen X & Y as:
|
|
// jmp_if_X TmpBB
|
|
// jmp FBB
|
|
// TmpBB:
|
|
// jmp_if_Y TBB
|
|
// jmp FBB
|
|
//
|
|
// This requires creation of TmpBB after CurBB.
|
|
|
|
// Emit the LHS condition.
|
|
FindMergedConditions(BOp->getOperand(0), TmpBB, FBB, CurBB, Opc);
|
|
|
|
// Emit the RHS condition into TmpBB.
|
|
FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, Opc);
|
|
}
|
|
}
|
|
|
|
/// If the set of cases should be emitted as a series of branches, return true.
|
|
/// If we should emit this as a bunch of and/or'd together conditions, return
|
|
/// false.
|
|
static bool
|
|
ShouldEmitAsBranches(const std::vector<SelectionDAGISel::CaseBlock> &Cases) {
|
|
if (Cases.size() != 2) return true;
|
|
|
|
// If this is two comparisons of the same values or'd or and'd together, they
|
|
// will get folded into a single comparison, so don't emit two blocks.
|
|
if ((Cases[0].CmpLHS == Cases[1].CmpLHS &&
|
|
Cases[0].CmpRHS == Cases[1].CmpRHS) ||
|
|
(Cases[0].CmpRHS == Cases[1].CmpLHS &&
|
|
Cases[0].CmpLHS == Cases[1].CmpRHS)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void SelectionDAGLowering::visitBr(BranchInst &I) {
|
|
// Update machine-CFG edges.
|
|
MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)];
|
|
|
|
// Figure out which block is immediately after the current one.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CurMBB;
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
if (I.isUnconditional()) {
|
|
// Update machine-CFG edges.
|
|
CurMBB->addSuccessor(Succ0MBB);
|
|
|
|
// If this is not a fall-through branch, emit the branch.
|
|
if (Succ0MBB != NextBlock)
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getControlRoot(),
|
|
DAG.getBasicBlock(Succ0MBB)));
|
|
return;
|
|
}
|
|
|
|
// If this condition is one of the special cases we handle, do special stuff
|
|
// now.
|
|
Value *CondVal = I.getCondition();
|
|
MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)];
|
|
|
|
// If this is a series of conditions that are or'd or and'd together, emit
|
|
// this as a sequence of branches instead of setcc's with and/or operations.
|
|
// For example, instead of something like:
|
|
// cmp A, B
|
|
// C = seteq
|
|
// cmp D, E
|
|
// F = setle
|
|
// or C, F
|
|
// jnz foo
|
|
// Emit:
|
|
// cmp A, B
|
|
// je foo
|
|
// cmp D, E
|
|
// jle foo
|
|
//
|
|
if (BinaryOperator *BOp = dyn_cast<BinaryOperator>(CondVal)) {
|
|
if (BOp->hasOneUse() &&
|
|
(BOp->getOpcode() == Instruction::And ||
|
|
BOp->getOpcode() == Instruction::Or)) {
|
|
FindMergedConditions(BOp, Succ0MBB, Succ1MBB, CurMBB, BOp->getOpcode());
|
|
// If the compares in later blocks need to use values not currently
|
|
// exported from this block, export them now. This block should always
|
|
// be the first entry.
|
|
assert(SwitchCases[0].ThisBB == CurMBB && "Unexpected lowering!");
|
|
|
|
// Allow some cases to be rejected.
|
|
if (ShouldEmitAsBranches(SwitchCases)) {
|
|
for (unsigned i = 1, e = SwitchCases.size(); i != e; ++i) {
|
|
ExportFromCurrentBlock(SwitchCases[i].CmpLHS);
|
|
ExportFromCurrentBlock(SwitchCases[i].CmpRHS);
|
|
}
|
|
|
|
// Emit the branch for this block.
|
|
visitSwitchCase(SwitchCases[0]);
|
|
SwitchCases.erase(SwitchCases.begin());
|
|
return;
|
|
}
|
|
|
|
// Okay, we decided not to do this, remove any inserted MBB's and clear
|
|
// SwitchCases.
|
|
for (unsigned i = 1, e = SwitchCases.size(); i != e; ++i)
|
|
CurMBB->getParent()->erase(SwitchCases[i].ThisBB);
|
|
|
|
SwitchCases.clear();
|
|
}
|
|
}
|
|
|
|
// Create a CaseBlock record representing this branch.
|
|
SelectionDAGISel::CaseBlock CB(ISD::SETEQ, CondVal, ConstantInt::getTrue(),
|
|
NULL, Succ0MBB, Succ1MBB, CurMBB);
|
|
// Use visitSwitchCase to actually insert the fast branch sequence for this
|
|
// cond branch.
|
|
visitSwitchCase(CB);
|
|
}
|
|
|
|
/// visitSwitchCase - Emits the necessary code to represent a single node in
|
|
/// the binary search tree resulting from lowering a switch instruction.
|
|
void SelectionDAGLowering::visitSwitchCase(SelectionDAGISel::CaseBlock &CB) {
|
|
SDOperand Cond;
|
|
SDOperand CondLHS = getValue(CB.CmpLHS);
|
|
|
|
// Build the setcc now.
|
|
if (CB.CmpMHS == NULL) {
|
|
// Fold "(X == true)" to X and "(X == false)" to !X to
|
|
// handle common cases produced by branch lowering.
|
|
if (CB.CmpRHS == ConstantInt::getTrue() && CB.CC == ISD::SETEQ)
|
|
Cond = CondLHS;
|
|
else if (CB.CmpRHS == ConstantInt::getFalse() && CB.CC == ISD::SETEQ) {
|
|
SDOperand True = DAG.getConstant(1, CondLHS.getValueType());
|
|
Cond = DAG.getNode(ISD::XOR, CondLHS.getValueType(), CondLHS, True);
|
|
} else
|
|
Cond = DAG.getSetCC(MVT::i1, CondLHS, getValue(CB.CmpRHS), CB.CC);
|
|
} else {
|
|
assert(CB.CC == ISD::SETLE && "Can handle only LE ranges now");
|
|
|
|
uint64_t Low = cast<ConstantInt>(CB.CmpLHS)->getSExtValue();
|
|
uint64_t High = cast<ConstantInt>(CB.CmpRHS)->getSExtValue();
|
|
|
|
SDOperand CmpOp = getValue(CB.CmpMHS);
|
|
MVT VT = CmpOp.getValueType();
|
|
|
|
if (cast<ConstantInt>(CB.CmpLHS)->isMinValue(true)) {
|
|
Cond = DAG.getSetCC(MVT::i1, CmpOp, DAG.getConstant(High, VT), ISD::SETLE);
|
|
} else {
|
|
SDOperand SUB = DAG.getNode(ISD::SUB, VT, CmpOp, DAG.getConstant(Low, VT));
|
|
Cond = DAG.getSetCC(MVT::i1, SUB,
|
|
DAG.getConstant(High-Low, VT), ISD::SETULE);
|
|
}
|
|
}
|
|
|
|
// Update successor info
|
|
CurMBB->addSuccessor(CB.TrueBB);
|
|
CurMBB->addSuccessor(CB.FalseBB);
|
|
|
|
// Set NextBlock to be the MBB immediately after the current one, if any.
|
|
// This is used to avoid emitting unnecessary branches to the next block.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CurMBB;
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
// If the lhs block is the next block, invert the condition so that we can
|
|
// fall through to the lhs instead of the rhs block.
|
|
if (CB.TrueBB == NextBlock) {
|
|
std::swap(CB.TrueBB, CB.FalseBB);
|
|
SDOperand True = DAG.getConstant(1, Cond.getValueType());
|
|
Cond = DAG.getNode(ISD::XOR, Cond.getValueType(), Cond, True);
|
|
}
|
|
SDOperand BrCond = DAG.getNode(ISD::BRCOND, MVT::Other, getControlRoot(), Cond,
|
|
DAG.getBasicBlock(CB.TrueBB));
|
|
if (CB.FalseBB == NextBlock)
|
|
DAG.setRoot(BrCond);
|
|
else
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, BrCond,
|
|
DAG.getBasicBlock(CB.FalseBB)));
|
|
}
|
|
|
|
/// visitJumpTable - Emit JumpTable node in the current MBB
|
|
void SelectionDAGLowering::visitJumpTable(SelectionDAGISel::JumpTable &JT) {
|
|
// Emit the code for the jump table
|
|
assert(JT.Reg != -1U && "Should lower JT Header first!");
|
|
MVT PTy = TLI.getPointerTy();
|
|
SDOperand Index = DAG.getCopyFromReg(getControlRoot(), JT.Reg, PTy);
|
|
SDOperand Table = DAG.getJumpTable(JT.JTI, PTy);
|
|
DAG.setRoot(DAG.getNode(ISD::BR_JT, MVT::Other, Index.getValue(1),
|
|
Table, Index));
|
|
return;
|
|
}
|
|
|
|
/// visitJumpTableHeader - This function emits necessary code to produce index
|
|
/// in the JumpTable from switch case.
|
|
void SelectionDAGLowering::visitJumpTableHeader(SelectionDAGISel::JumpTable &JT,
|
|
SelectionDAGISel::JumpTableHeader &JTH) {
|
|
// Subtract the lowest switch case value from the value being switched on
|
|
// and conditional branch to default mbb if the result is greater than the
|
|
// difference between smallest and largest cases.
|
|
SDOperand SwitchOp = getValue(JTH.SValue);
|
|
MVT VT = SwitchOp.getValueType();
|
|
SDOperand SUB = DAG.getNode(ISD::SUB, VT, SwitchOp,
|
|
DAG.getConstant(JTH.First, VT));
|
|
|
|
// The SDNode we just created, which holds the value being switched on
|
|
// minus the the smallest case value, needs to be copied to a virtual
|
|
// register so it can be used as an index into the jump table in a
|
|
// subsequent basic block. This value may be smaller or larger than the
|
|
// target's pointer type, and therefore require extension or truncating.
|
|
if (VT.bitsGT(TLI.getPointerTy()))
|
|
SwitchOp = DAG.getNode(ISD::TRUNCATE, TLI.getPointerTy(), SUB);
|
|
else
|
|
SwitchOp = DAG.getNode(ISD::ZERO_EXTEND, TLI.getPointerTy(), SUB);
|
|
|
|
unsigned JumpTableReg = FuncInfo.MakeReg(TLI.getPointerTy());
|
|
SDOperand CopyTo = DAG.getCopyToReg(getControlRoot(), JumpTableReg, SwitchOp);
|
|
JT.Reg = JumpTableReg;
|
|
|
|
// Emit the range check for the jump table, and branch to the default
|
|
// block for the switch statement if the value being switched on exceeds
|
|
// the largest case in the switch.
|
|
SDOperand CMP = DAG.getSetCC(TLI.getSetCCResultType(SUB), SUB,
|
|
DAG.getConstant(JTH.Last-JTH.First,VT),
|
|
ISD::SETUGT);
|
|
|
|
// Set NextBlock to be the MBB immediately after the current one, if any.
|
|
// This is used to avoid emitting unnecessary branches to the next block.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CurMBB;
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
SDOperand BrCond = DAG.getNode(ISD::BRCOND, MVT::Other, CopyTo, CMP,
|
|
DAG.getBasicBlock(JT.Default));
|
|
|
|
if (JT.MBB == NextBlock)
|
|
DAG.setRoot(BrCond);
|
|
else
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, BrCond,
|
|
DAG.getBasicBlock(JT.MBB)));
|
|
|
|
return;
|
|
}
|
|
|
|
/// visitBitTestHeader - This function emits necessary code to produce value
|
|
/// suitable for "bit tests"
|
|
void SelectionDAGLowering::visitBitTestHeader(SelectionDAGISel::BitTestBlock &B) {
|
|
// Subtract the minimum value
|
|
SDOperand SwitchOp = getValue(B.SValue);
|
|
MVT VT = SwitchOp.getValueType();
|
|
SDOperand SUB = DAG.getNode(ISD::SUB, VT, SwitchOp,
|
|
DAG.getConstant(B.First, VT));
|
|
|
|
// Check range
|
|
SDOperand RangeCmp = DAG.getSetCC(TLI.getSetCCResultType(SUB), SUB,
|
|
DAG.getConstant(B.Range, VT),
|
|
ISD::SETUGT);
|
|
|
|
SDOperand ShiftOp;
|
|
if (VT.bitsGT(TLI.getShiftAmountTy()))
|
|
ShiftOp = DAG.getNode(ISD::TRUNCATE, TLI.getShiftAmountTy(), SUB);
|
|
else
|
|
ShiftOp = DAG.getNode(ISD::ZERO_EXTEND, TLI.getShiftAmountTy(), SUB);
|
|
|
|
// Make desired shift
|
|
SDOperand SwitchVal = DAG.getNode(ISD::SHL, TLI.getPointerTy(),
|
|
DAG.getConstant(1, TLI.getPointerTy()),
|
|
ShiftOp);
|
|
|
|
unsigned SwitchReg = FuncInfo.MakeReg(TLI.getPointerTy());
|
|
SDOperand CopyTo = DAG.getCopyToReg(getControlRoot(), SwitchReg, SwitchVal);
|
|
B.Reg = SwitchReg;
|
|
|
|
// Set NextBlock to be the MBB immediately after the current one, if any.
|
|
// This is used to avoid emitting unnecessary branches to the next block.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CurMBB;
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
MachineBasicBlock* MBB = B.Cases[0].ThisBB;
|
|
|
|
CurMBB->addSuccessor(B.Default);
|
|
CurMBB->addSuccessor(MBB);
|
|
|
|
SDOperand BrRange = DAG.getNode(ISD::BRCOND, MVT::Other, CopyTo, RangeCmp,
|
|
DAG.getBasicBlock(B.Default));
|
|
|
|
if (MBB == NextBlock)
|
|
DAG.setRoot(BrRange);
|
|
else
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, CopyTo,
|
|
DAG.getBasicBlock(MBB)));
|
|
|
|
return;
|
|
}
|
|
|
|
/// visitBitTestCase - this function produces one "bit test"
|
|
void SelectionDAGLowering::visitBitTestCase(MachineBasicBlock* NextMBB,
|
|
unsigned Reg,
|
|
SelectionDAGISel::BitTestCase &B) {
|
|
// Emit bit tests and jumps
|
|
SDOperand SwitchVal = DAG.getCopyFromReg(getControlRoot(), Reg,
|
|
TLI.getPointerTy());
|
|
|
|
SDOperand AndOp = DAG.getNode(ISD::AND, TLI.getPointerTy(), SwitchVal,
|
|
DAG.getConstant(B.Mask, TLI.getPointerTy()));
|
|
SDOperand AndCmp = DAG.getSetCC(TLI.getSetCCResultType(AndOp), AndOp,
|
|
DAG.getConstant(0, TLI.getPointerTy()),
|
|
ISD::SETNE);
|
|
|
|
CurMBB->addSuccessor(B.TargetBB);
|
|
CurMBB->addSuccessor(NextMBB);
|
|
|
|
SDOperand BrAnd = DAG.getNode(ISD::BRCOND, MVT::Other, getControlRoot(),
|
|
AndCmp, DAG.getBasicBlock(B.TargetBB));
|
|
|
|
// Set NextBlock to be the MBB immediately after the current one, if any.
|
|
// This is used to avoid emitting unnecessary branches to the next block.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CurMBB;
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
if (NextMBB == NextBlock)
|
|
DAG.setRoot(BrAnd);
|
|
else
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, BrAnd,
|
|
DAG.getBasicBlock(NextMBB)));
|
|
|
|
return;
|
|
}
|
|
|
|
void SelectionDAGLowering::visitInvoke(InvokeInst &I) {
|
|
// Retrieve successors.
|
|
MachineBasicBlock *Return = FuncInfo.MBBMap[I.getSuccessor(0)];
|
|
MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)];
|
|
|
|
if (isa<InlineAsm>(I.getCalledValue()))
|
|
visitInlineAsm(&I);
|
|
else
|
|
LowerCallTo(&I, getValue(I.getOperand(0)), false, LandingPad);
|
|
|
|
// If the value of the invoke is used outside of its defining block, make it
|
|
// available as a virtual register.
|
|
if (!I.use_empty()) {
|
|
DenseMap<const Value*, unsigned>::iterator VMI = FuncInfo.ValueMap.find(&I);
|
|
if (VMI != FuncInfo.ValueMap.end())
|
|
CopyValueToVirtualRegister(&I, VMI->second);
|
|
}
|
|
|
|
// Update successor info
|
|
CurMBB->addSuccessor(Return);
|
|
CurMBB->addSuccessor(LandingPad);
|
|
|
|
// Drop into normal successor.
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getControlRoot(),
|
|
DAG.getBasicBlock(Return)));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitUnwind(UnwindInst &I) {
|
|
}
|
|
|
|
/// handleSmallSwitchCaseRange - Emit a series of specific tests (suitable for
|
|
/// small case ranges).
|
|
bool SelectionDAGLowering::handleSmallSwitchRange(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default) {
|
|
Case& BackCase = *(CR.Range.second-1);
|
|
|
|
// Size is the number of Cases represented by this range.
|
|
unsigned Size = CR.Range.second - CR.Range.first;
|
|
if (Size > 3)
|
|
return false;
|
|
|
|
// Get the MachineFunction which holds the current MBB. This is used when
|
|
// inserting any additional MBBs necessary to represent the switch.
|
|
MachineFunction *CurMF = CurMBB->getParent();
|
|
|
|
// Figure out which block is immediately after the current one.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CR.CaseBB;
|
|
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
// TODO: If any two of the cases has the same destination, and if one value
|
|
// is the same as the other, but has one bit unset that the other has set,
|
|
// use bit manipulation to do two compares at once. For example:
|
|
// "if (X == 6 || X == 4)" -> "if ((X|2) == 6)"
|
|
|
|
// Rearrange the case blocks so that the last one falls through if possible.
|
|
if (NextBlock && Default != NextBlock && BackCase.BB != NextBlock) {
|
|
// The last case block won't fall through into 'NextBlock' if we emit the
|
|
// branches in this order. See if rearranging a case value would help.
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second-1; I != E; ++I) {
|
|
if (I->BB == NextBlock) {
|
|
std::swap(*I, BackCase);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Create a CaseBlock record representing a conditional branch to
|
|
// the Case's target mbb if the value being switched on SV is equal
|
|
// to C.
|
|
MachineBasicBlock *CurBlock = CR.CaseBB;
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second; I != E; ++I) {
|
|
MachineBasicBlock *FallThrough;
|
|
if (I != E-1) {
|
|
FallThrough = CurMF->CreateMachineBasicBlock(CurBlock->getBasicBlock());
|
|
CurMF->insert(BBI, FallThrough);
|
|
} else {
|
|
// If the last case doesn't match, go to the default block.
|
|
FallThrough = Default;
|
|
}
|
|
|
|
Value *RHS, *LHS, *MHS;
|
|
ISD::CondCode CC;
|
|
if (I->High == I->Low) {
|
|
// This is just small small case range :) containing exactly 1 case
|
|
CC = ISD::SETEQ;
|
|
LHS = SV; RHS = I->High; MHS = NULL;
|
|
} else {
|
|
CC = ISD::SETLE;
|
|
LHS = I->Low; MHS = SV; RHS = I->High;
|
|
}
|
|
SelectionDAGISel::CaseBlock CB(CC, LHS, RHS, MHS,
|
|
I->BB, FallThrough, CurBlock);
|
|
|
|
// If emitting the first comparison, just call visitSwitchCase to emit the
|
|
// code into the current block. Otherwise, push the CaseBlock onto the
|
|
// vector to be later processed by SDISel, and insert the node's MBB
|
|
// before the next MBB.
|
|
if (CurBlock == CurMBB)
|
|
visitSwitchCase(CB);
|
|
else
|
|
SwitchCases.push_back(CB);
|
|
|
|
CurBlock = FallThrough;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool areJTsAllowed(const TargetLowering &TLI) {
|
|
return (TLI.isOperationLegal(ISD::BR_JT, MVT::Other) ||
|
|
TLI.isOperationLegal(ISD::BRIND, MVT::Other));
|
|
}
|
|
|
|
/// handleJTSwitchCase - Emit jumptable for current switch case range
|
|
bool SelectionDAGLowering::handleJTSwitchCase(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default) {
|
|
Case& FrontCase = *CR.Range.first;
|
|
Case& BackCase = *(CR.Range.second-1);
|
|
|
|
int64_t First = cast<ConstantInt>(FrontCase.Low)->getSExtValue();
|
|
int64_t Last = cast<ConstantInt>(BackCase.High)->getSExtValue();
|
|
|
|
uint64_t TSize = 0;
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second;
|
|
I!=E; ++I)
|
|
TSize += I->size();
|
|
|
|
if (!areJTsAllowed(TLI) || TSize <= 3)
|
|
return false;
|
|
|
|
double Density = (double)TSize / (double)((Last - First) + 1ULL);
|
|
if (Density < 0.4)
|
|
return false;
|
|
|
|
DOUT << "Lowering jump table\n"
|
|
<< "First entry: " << First << ". Last entry: " << Last << "\n"
|
|
<< "Size: " << TSize << ". Density: " << Density << "\n\n";
|
|
|
|
// Get the MachineFunction which holds the current MBB. This is used when
|
|
// inserting any additional MBBs necessary to represent the switch.
|
|
MachineFunction *CurMF = CurMBB->getParent();
|
|
|
|
// Figure out which block is immediately after the current one.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CR.CaseBB;
|
|
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
const BasicBlock *LLVMBB = CR.CaseBB->getBasicBlock();
|
|
|
|
// Create a new basic block to hold the code for loading the address
|
|
// of the jump table, and jumping to it. Update successor information;
|
|
// we will either branch to the default case for the switch, or the jump
|
|
// table.
|
|
MachineBasicBlock *JumpTableBB = CurMF->CreateMachineBasicBlock(LLVMBB);
|
|
CurMF->insert(BBI, JumpTableBB);
|
|
CR.CaseBB->addSuccessor(Default);
|
|
CR.CaseBB->addSuccessor(JumpTableBB);
|
|
|
|
// Build a vector of destination BBs, corresponding to each target
|
|
// of the jump table. If the value of the jump table slot corresponds to
|
|
// a case statement, push the case's BB onto the vector, otherwise, push
|
|
// the default BB.
|
|
std::vector<MachineBasicBlock*> DestBBs;
|
|
int64_t TEI = First;
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second; I != E; ++TEI) {
|
|
int64_t Low = cast<ConstantInt>(I->Low)->getSExtValue();
|
|
int64_t High = cast<ConstantInt>(I->High)->getSExtValue();
|
|
|
|
if ((Low <= TEI) && (TEI <= High)) {
|
|
DestBBs.push_back(I->BB);
|
|
if (TEI==High)
|
|
++I;
|
|
} else {
|
|
DestBBs.push_back(Default);
|
|
}
|
|
}
|
|
|
|
// Update successor info. Add one edge to each unique successor.
|
|
BitVector SuccsHandled(CR.CaseBB->getParent()->getNumBlockIDs());
|
|
for (std::vector<MachineBasicBlock*>::iterator I = DestBBs.begin(),
|
|
E = DestBBs.end(); I != E; ++I) {
|
|
if (!SuccsHandled[(*I)->getNumber()]) {
|
|
SuccsHandled[(*I)->getNumber()] = true;
|
|
JumpTableBB->addSuccessor(*I);
|
|
}
|
|
}
|
|
|
|
// Create a jump table index for this jump table, or return an existing
|
|
// one.
|
|
unsigned JTI = CurMF->getJumpTableInfo()->getJumpTableIndex(DestBBs);
|
|
|
|
// Set the jump table information so that we can codegen it as a second
|
|
// MachineBasicBlock
|
|
SelectionDAGISel::JumpTable JT(-1U, JTI, JumpTableBB, Default);
|
|
SelectionDAGISel::JumpTableHeader JTH(First, Last, SV, CR.CaseBB,
|
|
(CR.CaseBB == CurMBB));
|
|
if (CR.CaseBB == CurMBB)
|
|
visitJumpTableHeader(JT, JTH);
|
|
|
|
JTCases.push_back(SelectionDAGISel::JumpTableBlock(JTH, JT));
|
|
|
|
return true;
|
|
}
|
|
|
|
/// handleBTSplitSwitchCase - emit comparison and split binary search tree into
|
|
/// 2 subtrees.
|
|
bool SelectionDAGLowering::handleBTSplitSwitchCase(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default) {
|
|
// Get the MachineFunction which holds the current MBB. This is used when
|
|
// inserting any additional MBBs necessary to represent the switch.
|
|
MachineFunction *CurMF = CurMBB->getParent();
|
|
|
|
// Figure out which block is immediately after the current one.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CR.CaseBB;
|
|
|
|
if (++BBI != CurMBB->getParent()->end())
|
|
NextBlock = BBI;
|
|
|
|
Case& FrontCase = *CR.Range.first;
|
|
Case& BackCase = *(CR.Range.second-1);
|
|
const BasicBlock *LLVMBB = CR.CaseBB->getBasicBlock();
|
|
|
|
// Size is the number of Cases represented by this range.
|
|
unsigned Size = CR.Range.second - CR.Range.first;
|
|
|
|
int64_t First = cast<ConstantInt>(FrontCase.Low)->getSExtValue();
|
|
int64_t Last = cast<ConstantInt>(BackCase.High)->getSExtValue();
|
|
double FMetric = 0;
|
|
CaseItr Pivot = CR.Range.first + Size/2;
|
|
|
|
// Select optimal pivot, maximizing sum density of LHS and RHS. This will
|
|
// (heuristically) allow us to emit JumpTable's later.
|
|
uint64_t TSize = 0;
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second;
|
|
I!=E; ++I)
|
|
TSize += I->size();
|
|
|
|
uint64_t LSize = FrontCase.size();
|
|
uint64_t RSize = TSize-LSize;
|
|
DOUT << "Selecting best pivot: \n"
|
|
<< "First: " << First << ", Last: " << Last <<"\n"
|
|
<< "LSize: " << LSize << ", RSize: " << RSize << "\n";
|
|
for (CaseItr I = CR.Range.first, J=I+1, E = CR.Range.second;
|
|
J!=E; ++I, ++J) {
|
|
int64_t LEnd = cast<ConstantInt>(I->High)->getSExtValue();
|
|
int64_t RBegin = cast<ConstantInt>(J->Low)->getSExtValue();
|
|
assert((RBegin-LEnd>=1) && "Invalid case distance");
|
|
double LDensity = (double)LSize / (double)((LEnd - First) + 1ULL);
|
|
double RDensity = (double)RSize / (double)((Last - RBegin) + 1ULL);
|
|
double Metric = Log2_64(RBegin-LEnd)*(LDensity+RDensity);
|
|
// Should always split in some non-trivial place
|
|
DOUT <<"=>Step\n"
|
|
<< "LEnd: " << LEnd << ", RBegin: " << RBegin << "\n"
|
|
<< "LDensity: " << LDensity << ", RDensity: " << RDensity << "\n"
|
|
<< "Metric: " << Metric << "\n";
|
|
if (FMetric < Metric) {
|
|
Pivot = J;
|
|
FMetric = Metric;
|
|
DOUT << "Current metric set to: " << FMetric << "\n";
|
|
}
|
|
|
|
LSize += J->size();
|
|
RSize -= J->size();
|
|
}
|
|
if (areJTsAllowed(TLI)) {
|
|
// If our case is dense we *really* should handle it earlier!
|
|
assert((FMetric > 0) && "Should handle dense range earlier!");
|
|
} else {
|
|
Pivot = CR.Range.first + Size/2;
|
|
}
|
|
|
|
CaseRange LHSR(CR.Range.first, Pivot);
|
|
CaseRange RHSR(Pivot, CR.Range.second);
|
|
Constant *C = Pivot->Low;
|
|
MachineBasicBlock *FalseBB = 0, *TrueBB = 0;
|
|
|
|
// We know that we branch to the LHS if the Value being switched on is
|
|
// less than the Pivot value, C. We use this to optimize our binary
|
|
// tree a bit, by recognizing that if SV is greater than or equal to the
|
|
// LHS's Case Value, and that Case Value is exactly one less than the
|
|
// Pivot's Value, then we can branch directly to the LHS's Target,
|
|
// rather than creating a leaf node for it.
|
|
if ((LHSR.second - LHSR.first) == 1 &&
|
|
LHSR.first->High == CR.GE &&
|
|
cast<ConstantInt>(C)->getSExtValue() ==
|
|
(cast<ConstantInt>(CR.GE)->getSExtValue() + 1LL)) {
|
|
TrueBB = LHSR.first->BB;
|
|
} else {
|
|
TrueBB = CurMF->CreateMachineBasicBlock(LLVMBB);
|
|
CurMF->insert(BBI, TrueBB);
|
|
WorkList.push_back(CaseRec(TrueBB, C, CR.GE, LHSR));
|
|
}
|
|
|
|
// Similar to the optimization above, if the Value being switched on is
|
|
// known to be less than the Constant CR.LT, and the current Case Value
|
|
// is CR.LT - 1, then we can branch directly to the target block for
|
|
// the current Case Value, rather than emitting a RHS leaf node for it.
|
|
if ((RHSR.second - RHSR.first) == 1 && CR.LT &&
|
|
cast<ConstantInt>(RHSR.first->Low)->getSExtValue() ==
|
|
(cast<ConstantInt>(CR.LT)->getSExtValue() - 1LL)) {
|
|
FalseBB = RHSR.first->BB;
|
|
} else {
|
|
FalseBB = CurMF->CreateMachineBasicBlock(LLVMBB);
|
|
CurMF->insert(BBI, FalseBB);
|
|
WorkList.push_back(CaseRec(FalseBB,CR.LT,C,RHSR));
|
|
}
|
|
|
|
// Create a CaseBlock record representing a conditional branch to
|
|
// the LHS node if the value being switched on SV is less than C.
|
|
// Otherwise, branch to LHS.
|
|
SelectionDAGISel::CaseBlock CB(ISD::SETLT, SV, C, NULL,
|
|
TrueBB, FalseBB, CR.CaseBB);
|
|
|
|
if (CR.CaseBB == CurMBB)
|
|
visitSwitchCase(CB);
|
|
else
|
|
SwitchCases.push_back(CB);
|
|
|
|
return true;
|
|
}
|
|
|
|
/// handleBitTestsSwitchCase - if current case range has few destination and
|
|
/// range span less, than machine word bitwidth, encode case range into series
|
|
/// of masks and emit bit tests with these masks.
|
|
bool SelectionDAGLowering::handleBitTestsSwitchCase(CaseRec& CR,
|
|
CaseRecVector& WorkList,
|
|
Value* SV,
|
|
MachineBasicBlock* Default){
|
|
unsigned IntPtrBits = TLI.getPointerTy().getSizeInBits();
|
|
|
|
Case& FrontCase = *CR.Range.first;
|
|
Case& BackCase = *(CR.Range.second-1);
|
|
|
|
// Get the MachineFunction which holds the current MBB. This is used when
|
|
// inserting any additional MBBs necessary to represent the switch.
|
|
MachineFunction *CurMF = CurMBB->getParent();
|
|
|
|
unsigned numCmps = 0;
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second;
|
|
I!=E; ++I) {
|
|
// Single case counts one, case range - two.
|
|
if (I->Low == I->High)
|
|
numCmps +=1;
|
|
else
|
|
numCmps +=2;
|
|
}
|
|
|
|
// Count unique destinations
|
|
SmallSet<MachineBasicBlock*, 4> Dests;
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second; I!=E; ++I) {
|
|
Dests.insert(I->BB);
|
|
if (Dests.size() > 3)
|
|
// Don't bother the code below, if there are too much unique destinations
|
|
return false;
|
|
}
|
|
DOUT << "Total number of unique destinations: " << Dests.size() << "\n"
|
|
<< "Total number of comparisons: " << numCmps << "\n";
|
|
|
|
// Compute span of values.
|
|
Constant* minValue = FrontCase.Low;
|
|
Constant* maxValue = BackCase.High;
|
|
uint64_t range = cast<ConstantInt>(maxValue)->getSExtValue() -
|
|
cast<ConstantInt>(minValue)->getSExtValue();
|
|
DOUT << "Compare range: " << range << "\n"
|
|
<< "Low bound: " << cast<ConstantInt>(minValue)->getSExtValue() << "\n"
|
|
<< "High bound: " << cast<ConstantInt>(maxValue)->getSExtValue() << "\n";
|
|
|
|
if (range>=IntPtrBits ||
|
|
(!(Dests.size() == 1 && numCmps >= 3) &&
|
|
!(Dests.size() == 2 && numCmps >= 5) &&
|
|
!(Dests.size() >= 3 && numCmps >= 6)))
|
|
return false;
|
|
|
|
DOUT << "Emitting bit tests\n";
|
|
int64_t lowBound = 0;
|
|
|
|
// Optimize the case where all the case values fit in a
|
|
// word without having to subtract minValue. In this case,
|
|
// we can optimize away the subtraction.
|
|
if (cast<ConstantInt>(minValue)->getSExtValue() >= 0 &&
|
|
cast<ConstantInt>(maxValue)->getSExtValue() < IntPtrBits) {
|
|
range = cast<ConstantInt>(maxValue)->getSExtValue();
|
|
} else {
|
|
lowBound = cast<ConstantInt>(minValue)->getSExtValue();
|
|
}
|
|
|
|
CaseBitsVector CasesBits;
|
|
unsigned i, count = 0;
|
|
|
|
for (CaseItr I = CR.Range.first, E = CR.Range.second; I!=E; ++I) {
|
|
MachineBasicBlock* Dest = I->BB;
|
|
for (i = 0; i < count; ++i)
|
|
if (Dest == CasesBits[i].BB)
|
|
break;
|
|
|
|
if (i == count) {
|
|
assert((count < 3) && "Too much destinations to test!");
|
|
CasesBits.push_back(CaseBits(0, Dest, 0));
|
|
count++;
|
|
}
|
|
|
|
uint64_t lo = cast<ConstantInt>(I->Low)->getSExtValue() - lowBound;
|
|
uint64_t hi = cast<ConstantInt>(I->High)->getSExtValue() - lowBound;
|
|
|
|
for (uint64_t j = lo; j <= hi; j++) {
|
|
CasesBits[i].Mask |= 1ULL << j;
|
|
CasesBits[i].Bits++;
|
|
}
|
|
|
|
}
|
|
std::sort(CasesBits.begin(), CasesBits.end(), CaseBitsCmp());
|
|
|
|
SelectionDAGISel::BitTestInfo BTC;
|
|
|
|
// Figure out which block is immediately after the current one.
|
|
MachineFunction::iterator BBI = CR.CaseBB;
|
|
++BBI;
|
|
|
|
const BasicBlock *LLVMBB = CR.CaseBB->getBasicBlock();
|
|
|
|
DOUT << "Cases:\n";
|
|
for (unsigned i = 0, e = CasesBits.size(); i!=e; ++i) {
|
|
DOUT << "Mask: " << CasesBits[i].Mask << ", Bits: " << CasesBits[i].Bits
|
|
<< ", BB: " << CasesBits[i].BB << "\n";
|
|
|
|
MachineBasicBlock *CaseBB = CurMF->CreateMachineBasicBlock(LLVMBB);
|
|
CurMF->insert(BBI, CaseBB);
|
|
BTC.push_back(SelectionDAGISel::BitTestCase(CasesBits[i].Mask,
|
|
CaseBB,
|
|
CasesBits[i].BB));
|
|
}
|
|
|
|
SelectionDAGISel::BitTestBlock BTB(lowBound, range, SV,
|
|
-1U, (CR.CaseBB == CurMBB),
|
|
CR.CaseBB, Default, BTC);
|
|
|
|
if (CR.CaseBB == CurMBB)
|
|
visitBitTestHeader(BTB);
|
|
|
|
BitTestCases.push_back(BTB);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/// Clusterify - Transform simple list of Cases into list of CaseRange's
|
|
unsigned SelectionDAGLowering::Clusterify(CaseVector& Cases,
|
|
const SwitchInst& SI) {
|
|
unsigned numCmps = 0;
|
|
|
|
// Start with "simple" cases
|
|
for (unsigned i = 1; i < SI.getNumSuccessors(); ++i) {
|
|
MachineBasicBlock *SMBB = FuncInfo.MBBMap[SI.getSuccessor(i)];
|
|
Cases.push_back(Case(SI.getSuccessorValue(i),
|
|
SI.getSuccessorValue(i),
|
|
SMBB));
|
|
}
|
|
std::sort(Cases.begin(), Cases.end(), CaseCmp());
|
|
|
|
// Merge case into clusters
|
|
if (Cases.size()>=2)
|
|
// Must recompute end() each iteration because it may be
|
|
// invalidated by erase if we hold on to it
|
|
for (CaseItr I=Cases.begin(), J=++(Cases.begin()); J!=Cases.end(); ) {
|
|
int64_t nextValue = cast<ConstantInt>(J->Low)->getSExtValue();
|
|
int64_t currentValue = cast<ConstantInt>(I->High)->getSExtValue();
|
|
MachineBasicBlock* nextBB = J->BB;
|
|
MachineBasicBlock* currentBB = I->BB;
|
|
|
|
// If the two neighboring cases go to the same destination, merge them
|
|
// into a single case.
|
|
if ((nextValue-currentValue==1) && (currentBB == nextBB)) {
|
|
I->High = J->High;
|
|
J = Cases.erase(J);
|
|
} else {
|
|
I = J++;
|
|
}
|
|
}
|
|
|
|
for (CaseItr I=Cases.begin(), E=Cases.end(); I!=E; ++I, ++numCmps) {
|
|
if (I->Low != I->High)
|
|
// A range counts double, since it requires two compares.
|
|
++numCmps;
|
|
}
|
|
|
|
return numCmps;
|
|
}
|
|
|
|
void SelectionDAGLowering::visitSwitch(SwitchInst &SI) {
|
|
// Figure out which block is immediately after the current one.
|
|
MachineBasicBlock *NextBlock = 0;
|
|
MachineFunction::iterator BBI = CurMBB;
|
|
|
|
MachineBasicBlock *Default = FuncInfo.MBBMap[SI.getDefaultDest()];
|
|
|
|
// If there is only the default destination, branch to it if it is not the
|
|
// next basic block. Otherwise, just fall through.
|
|
if (SI.getNumOperands() == 2) {
|
|
// Update machine-CFG edges.
|
|
|
|
// If this is not a fall-through branch, emit the branch.
|
|
CurMBB->addSuccessor(Default);
|
|
if (Default != NextBlock)
|
|
DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getControlRoot(),
|
|
DAG.getBasicBlock(Default)));
|
|
|
|
return;
|
|
}
|
|
|
|
// If there are any non-default case statements, create a vector of Cases
|
|
// representing each one, and sort the vector so that we can efficiently
|
|
// create a binary search tree from them.
|
|
CaseVector Cases;
|
|
unsigned numCmps = Clusterify(Cases, SI);
|
|
DOUT << "Clusterify finished. Total clusters: " << Cases.size()
|
|
<< ". Total compares: " << numCmps << "\n";
|
|
|
|
// Get the Value to be switched on and default basic blocks, which will be
|
|
// inserted into CaseBlock records, representing basic blocks in the binary
|
|
// search tree.
|
|
Value *SV = SI.getOperand(0);
|
|
|
|
// Push the initial CaseRec onto the worklist
|
|
CaseRecVector WorkList;
|
|
WorkList.push_back(CaseRec(CurMBB,0,0,CaseRange(Cases.begin(),Cases.end())));
|
|
|
|
while (!WorkList.empty()) {
|
|
// Grab a record representing a case range to process off the worklist
|
|
CaseRec CR = WorkList.back();
|
|
WorkList.pop_back();
|
|
|
|
if (handleBitTestsSwitchCase(CR, WorkList, SV, Default))
|
|
continue;
|
|
|
|
// If the range has few cases (two or less) emit a series of specific
|
|
// tests.
|
|
if (handleSmallSwitchRange(CR, WorkList, SV, Default))
|
|
continue;
|
|
|
|
// If the switch has more than 5 blocks, and at least 40% dense, and the
|
|
// target supports indirect branches, then emit a jump table rather than
|
|
// lowering the switch to a binary tree of conditional branches.
|
|
if (handleJTSwitchCase(CR, WorkList, SV, Default))
|
|
continue;
|
|
|
|
// Emit binary tree. We need to pick a pivot, and push left and right ranges
|
|
// onto the worklist. Leafs are handled via handleSmallSwitchRange() call.
|
|
handleBTSplitSwitchCase(CR, WorkList, SV, Default);
|
|
}
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitSub(User &I) {
|
|
// -0.0 - X --> fneg
|
|
const Type *Ty = I.getType();
|
|
if (isa<VectorType>(Ty)) {
|
|
if (ConstantVector *CV = dyn_cast<ConstantVector>(I.getOperand(0))) {
|
|
const VectorType *DestTy = cast<VectorType>(I.getType());
|
|
const Type *ElTy = DestTy->getElementType();
|
|
if (ElTy->isFloatingPoint()) {
|
|
unsigned VL = DestTy->getNumElements();
|
|
std::vector<Constant*> NZ(VL, ConstantFP::getNegativeZero(ElTy));
|
|
Constant *CNZ = ConstantVector::get(&NZ[0], NZ.size());
|
|
if (CV == CNZ) {
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (Ty->isFloatingPoint()) {
|
|
if (ConstantFP *CFP = dyn_cast<ConstantFP>(I.getOperand(0)))
|
|
if (CFP->isExactlyValue(ConstantFP::getNegativeZero(Ty)->getValueAPF())) {
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2));
|
|
return;
|
|
}
|
|
}
|
|
|
|
visitBinary(I, Ty->isFPOrFPVector() ? ISD::FSUB : ISD::SUB);
|
|
}
|
|
|
|
void SelectionDAGLowering::visitBinary(User &I, unsigned OpCode) {
|
|
SDOperand Op1 = getValue(I.getOperand(0));
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
|
|
setValue(&I, DAG.getNode(OpCode, Op1.getValueType(), Op1, Op2));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitShift(User &I, unsigned Opcode) {
|
|
SDOperand Op1 = getValue(I.getOperand(0));
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
|
|
if (TLI.getShiftAmountTy().bitsLT(Op2.getValueType()))
|
|
Op2 = DAG.getNode(ISD::TRUNCATE, TLI.getShiftAmountTy(), Op2);
|
|
else if (TLI.getShiftAmountTy().bitsGT(Op2.getValueType()))
|
|
Op2 = DAG.getNode(ISD::ANY_EXTEND, TLI.getShiftAmountTy(), Op2);
|
|
|
|
setValue(&I, DAG.getNode(Opcode, Op1.getValueType(), Op1, Op2));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitICmp(User &I) {
|
|
ICmpInst::Predicate predicate = ICmpInst::BAD_ICMP_PREDICATE;
|
|
if (ICmpInst *IC = dyn_cast<ICmpInst>(&I))
|
|
predicate = IC->getPredicate();
|
|
else if (ConstantExpr *IC = dyn_cast<ConstantExpr>(&I))
|
|
predicate = ICmpInst::Predicate(IC->getPredicate());
|
|
SDOperand Op1 = getValue(I.getOperand(0));
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
ISD::CondCode Opcode;
|
|
switch (predicate) {
|
|
case ICmpInst::ICMP_EQ : Opcode = ISD::SETEQ; break;
|
|
case ICmpInst::ICMP_NE : Opcode = ISD::SETNE; break;
|
|
case ICmpInst::ICMP_UGT : Opcode = ISD::SETUGT; break;
|
|
case ICmpInst::ICMP_UGE : Opcode = ISD::SETUGE; break;
|
|
case ICmpInst::ICMP_ULT : Opcode = ISD::SETULT; break;
|
|
case ICmpInst::ICMP_ULE : Opcode = ISD::SETULE; break;
|
|
case ICmpInst::ICMP_SGT : Opcode = ISD::SETGT; break;
|
|
case ICmpInst::ICMP_SGE : Opcode = ISD::SETGE; break;
|
|
case ICmpInst::ICMP_SLT : Opcode = ISD::SETLT; break;
|
|
case ICmpInst::ICMP_SLE : Opcode = ISD::SETLE; break;
|
|
default:
|
|
assert(!"Invalid ICmp predicate value");
|
|
Opcode = ISD::SETEQ;
|
|
break;
|
|
}
|
|
setValue(&I, DAG.getSetCC(MVT::i1, Op1, Op2, Opcode));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitFCmp(User &I) {
|
|
FCmpInst::Predicate predicate = FCmpInst::BAD_FCMP_PREDICATE;
|
|
if (FCmpInst *FC = dyn_cast<FCmpInst>(&I))
|
|
predicate = FC->getPredicate();
|
|
else if (ConstantExpr *FC = dyn_cast<ConstantExpr>(&I))
|
|
predicate = FCmpInst::Predicate(FC->getPredicate());
|
|
SDOperand Op1 = getValue(I.getOperand(0));
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
ISD::CondCode Condition, FOC, FPC;
|
|
switch (predicate) {
|
|
case FCmpInst::FCMP_FALSE: FOC = FPC = ISD::SETFALSE; break;
|
|
case FCmpInst::FCMP_OEQ: FOC = ISD::SETEQ; FPC = ISD::SETOEQ; break;
|
|
case FCmpInst::FCMP_OGT: FOC = ISD::SETGT; FPC = ISD::SETOGT; break;
|
|
case FCmpInst::FCMP_OGE: FOC = ISD::SETGE; FPC = ISD::SETOGE; break;
|
|
case FCmpInst::FCMP_OLT: FOC = ISD::SETLT; FPC = ISD::SETOLT; break;
|
|
case FCmpInst::FCMP_OLE: FOC = ISD::SETLE; FPC = ISD::SETOLE; break;
|
|
case FCmpInst::FCMP_ONE: FOC = ISD::SETNE; FPC = ISD::SETONE; break;
|
|
case FCmpInst::FCMP_ORD: FOC = FPC = ISD::SETO; break;
|
|
case FCmpInst::FCMP_UNO: FOC = FPC = ISD::SETUO; break;
|
|
case FCmpInst::FCMP_UEQ: FOC = ISD::SETEQ; FPC = ISD::SETUEQ; break;
|
|
case FCmpInst::FCMP_UGT: FOC = ISD::SETGT; FPC = ISD::SETUGT; break;
|
|
case FCmpInst::FCMP_UGE: FOC = ISD::SETGE; FPC = ISD::SETUGE; break;
|
|
case FCmpInst::FCMP_ULT: FOC = ISD::SETLT; FPC = ISD::SETULT; break;
|
|
case FCmpInst::FCMP_ULE: FOC = ISD::SETLE; FPC = ISD::SETULE; break;
|
|
case FCmpInst::FCMP_UNE: FOC = ISD::SETNE; FPC = ISD::SETUNE; break;
|
|
case FCmpInst::FCMP_TRUE: FOC = FPC = ISD::SETTRUE; break;
|
|
default:
|
|
assert(!"Invalid FCmp predicate value");
|
|
FOC = FPC = ISD::SETFALSE;
|
|
break;
|
|
}
|
|
if (FiniteOnlyFPMath())
|
|
Condition = FOC;
|
|
else
|
|
Condition = FPC;
|
|
setValue(&I, DAG.getSetCC(MVT::i1, Op1, Op2, Condition));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitVICmp(User &I) {
|
|
ICmpInst::Predicate predicate = ICmpInst::BAD_ICMP_PREDICATE;
|
|
if (VICmpInst *IC = dyn_cast<VICmpInst>(&I))
|
|
predicate = IC->getPredicate();
|
|
else if (ConstantExpr *IC = dyn_cast<ConstantExpr>(&I))
|
|
predicate = ICmpInst::Predicate(IC->getPredicate());
|
|
SDOperand Op1 = getValue(I.getOperand(0));
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
ISD::CondCode Opcode;
|
|
switch (predicate) {
|
|
case ICmpInst::ICMP_EQ : Opcode = ISD::SETEQ; break;
|
|
case ICmpInst::ICMP_NE : Opcode = ISD::SETNE; break;
|
|
case ICmpInst::ICMP_UGT : Opcode = ISD::SETUGT; break;
|
|
case ICmpInst::ICMP_UGE : Opcode = ISD::SETUGE; break;
|
|
case ICmpInst::ICMP_ULT : Opcode = ISD::SETULT; break;
|
|
case ICmpInst::ICMP_ULE : Opcode = ISD::SETULE; break;
|
|
case ICmpInst::ICMP_SGT : Opcode = ISD::SETGT; break;
|
|
case ICmpInst::ICMP_SGE : Opcode = ISD::SETGE; break;
|
|
case ICmpInst::ICMP_SLT : Opcode = ISD::SETLT; break;
|
|
case ICmpInst::ICMP_SLE : Opcode = ISD::SETLE; break;
|
|
default:
|
|
assert(!"Invalid ICmp predicate value");
|
|
Opcode = ISD::SETEQ;
|
|
break;
|
|
}
|
|
setValue(&I, DAG.getVSetCC(Op1.getValueType(), Op1, Op2, Opcode));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitVFCmp(User &I) {
|
|
FCmpInst::Predicate predicate = FCmpInst::BAD_FCMP_PREDICATE;
|
|
if (VFCmpInst *FC = dyn_cast<VFCmpInst>(&I))
|
|
predicate = FC->getPredicate();
|
|
else if (ConstantExpr *FC = dyn_cast<ConstantExpr>(&I))
|
|
predicate = FCmpInst::Predicate(FC->getPredicate());
|
|
SDOperand Op1 = getValue(I.getOperand(0));
|
|
SDOperand Op2 = getValue(I.getOperand(1));
|
|
ISD::CondCode Condition, FOC, FPC;
|
|
switch (predicate) {
|
|
case FCmpInst::FCMP_FALSE: FOC = FPC = ISD::SETFALSE; break;
|
|
case FCmpInst::FCMP_OEQ: FOC = ISD::SETEQ; FPC = ISD::SETOEQ; break;
|
|
case FCmpInst::FCMP_OGT: FOC = ISD::SETGT; FPC = ISD::SETOGT; break;
|
|
case FCmpInst::FCMP_OGE: FOC = ISD::SETGE; FPC = ISD::SETOGE; break;
|
|
case FCmpInst::FCMP_OLT: FOC = ISD::SETLT; FPC = ISD::SETOLT; break;
|
|
case FCmpInst::FCMP_OLE: FOC = ISD::SETLE; FPC = ISD::SETOLE; break;
|
|
case FCmpInst::FCMP_ONE: FOC = ISD::SETNE; FPC = ISD::SETONE; break;
|
|
case FCmpInst::FCMP_ORD: FOC = FPC = ISD::SETO; break;
|
|
case FCmpInst::FCMP_UNO: FOC = FPC = ISD::SETUO; break;
|
|
case FCmpInst::FCMP_UEQ: FOC = ISD::SETEQ; FPC = ISD::SETUEQ; break;
|
|
case FCmpInst::FCMP_UGT: FOC = ISD::SETGT; FPC = ISD::SETUGT; break;
|
|
case FCmpInst::FCMP_UGE: FOC = ISD::SETGE; FPC = ISD::SETUGE; break;
|
|
case FCmpInst::FCMP_ULT: FOC = ISD::SETLT; FPC = ISD::SETULT; break;
|
|
case FCmpInst::FCMP_ULE: FOC = ISD::SETLE; FPC = ISD::SETULE; break;
|
|
case FCmpInst::FCMP_UNE: FOC = ISD::SETNE; FPC = ISD::SETUNE; break;
|
|
case FCmpInst::FCMP_TRUE: FOC = FPC = ISD::SETTRUE; break;
|
|
default:
|
|
assert(!"Invalid VFCmp predicate value");
|
|
FOC = FPC = ISD::SETFALSE;
|
|
break;
|
|
}
|
|
if (FiniteOnlyFPMath())
|
|
Condition = FOC;
|
|
else
|
|
Condition = FPC;
|
|
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
|
|
setValue(&I, DAG.getVSetCC(DestVT, Op1, Op2, Condition));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitSelect(User &I) {
|
|
SDOperand Cond = getValue(I.getOperand(0));
|
|
SDOperand TrueVal = getValue(I.getOperand(1));
|
|
SDOperand FalseVal = getValue(I.getOperand(2));
|
|
setValue(&I, DAG.getNode(ISD::SELECT, TrueVal.getValueType(), Cond,
|
|
TrueVal, FalseVal));
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitTrunc(User &I) {
|
|
// TruncInst cannot be a no-op cast because sizeof(src) > sizeof(dest).
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::TRUNCATE, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitZExt(User &I) {
|
|
// ZExt cannot be a no-op cast because sizeof(src) < sizeof(dest).
|
|
// ZExt also can't be a cast to bool for same reason. So, nothing much to do
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitSExt(User &I) {
|
|
// SExt cannot be a no-op cast because sizeof(src) < sizeof(dest).
|
|
// SExt also can't be a cast to bool for same reason. So, nothing much to do
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitFPTrunc(User &I) {
|
|
// FPTrunc is never a no-op cast, no need to check
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::FP_ROUND, DestVT, N, DAG.getIntPtrConstant(0)));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitFPExt(User &I){
|
|
// FPTrunc is never a no-op cast, no need to check
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitFPToUI(User &I) {
|
|
// FPToUI is never a no-op cast, no need to check
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::FP_TO_UINT, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitFPToSI(User &I) {
|
|
// FPToSI is never a no-op cast, no need to check
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::FP_TO_SINT, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitUIToFP(User &I) {
|
|
// UIToFP is never a no-op cast, no need to check
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::UINT_TO_FP, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitSIToFP(User &I){
|
|
// UIToFP is never a no-op cast, no need to check
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
setValue(&I, DAG.getNode(ISD::SINT_TO_FP, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitPtrToInt(User &I) {
|
|
// What to do depends on the size of the integer and the size of the pointer.
|
|
// We can either truncate, zero extend, or no-op, accordingly.
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT SrcVT = N.getValueType();
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
SDOperand Result;
|
|
if (DestVT.bitsLT(SrcVT))
|
|
Result = DAG.getNode(ISD::TRUNCATE, DestVT, N);
|
|
else
|
|
// Note: ZERO_EXTEND can handle cases where the sizes are equal too
|
|
Result = DAG.getNode(ISD::ZERO_EXTEND, DestVT, N);
|
|
setValue(&I, Result);
|
|
}
|
|
|
|
void SelectionDAGLowering::visitIntToPtr(User &I) {
|
|
// What to do depends on the size of the integer and the size of the pointer.
|
|
// We can either truncate, zero extend, or no-op, accordingly.
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT SrcVT = N.getValueType();
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
if (DestVT.bitsLT(SrcVT))
|
|
setValue(&I, DAG.getNode(ISD::TRUNCATE, DestVT, N));
|
|
else
|
|
// Note: ZERO_EXTEND can handle cases where the sizes are equal too
|
|
setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestVT, N));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitBitCast(User &I) {
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
MVT DestVT = TLI.getValueType(I.getType());
|
|
|
|
// BitCast assures us that source and destination are the same size so this
|
|
// is either a BIT_CONVERT or a no-op.
|
|
if (DestVT != N.getValueType())
|
|
setValue(&I, DAG.getNode(ISD::BIT_CONVERT, DestVT, N)); // convert types
|
|
else
|
|
setValue(&I, N); // noop cast.
|
|
}
|
|
|
|
void SelectionDAGLowering::visitInsertElement(User &I) {
|
|
SDOperand InVec = getValue(I.getOperand(0));
|
|
SDOperand InVal = getValue(I.getOperand(1));
|
|
SDOperand InIdx = DAG.getNode(ISD::ZERO_EXTEND, TLI.getPointerTy(),
|
|
getValue(I.getOperand(2)));
|
|
|
|
setValue(&I, DAG.getNode(ISD::INSERT_VECTOR_ELT,
|
|
TLI.getValueType(I.getType()),
|
|
InVec, InVal, InIdx));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitExtractElement(User &I) {
|
|
SDOperand InVec = getValue(I.getOperand(0));
|
|
SDOperand InIdx = DAG.getNode(ISD::ZERO_EXTEND, TLI.getPointerTy(),
|
|
getValue(I.getOperand(1)));
|
|
setValue(&I, DAG.getNode(ISD::EXTRACT_VECTOR_ELT,
|
|
TLI.getValueType(I.getType()), InVec, InIdx));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitShuffleVector(User &I) {
|
|
SDOperand V1 = getValue(I.getOperand(0));
|
|
SDOperand V2 = getValue(I.getOperand(1));
|
|
SDOperand Mask = getValue(I.getOperand(2));
|
|
|
|
setValue(&I, DAG.getNode(ISD::VECTOR_SHUFFLE,
|
|
TLI.getValueType(I.getType()),
|
|
V1, V2, Mask));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitInsertValue(InsertValueInst &I) {
|
|
const Value *Op0 = I.getOperand(0);
|
|
const Value *Op1 = I.getOperand(1);
|
|
const Type *AggTy = I.getType();
|
|
const Type *ValTy = Op1->getType();
|
|
bool IntoUndef = isa<UndefValue>(Op0);
|
|
bool FromUndef = isa<UndefValue>(Op1);
|
|
|
|
unsigned LinearIndex = ComputeLinearIndex(TLI, AggTy,
|
|
I.idx_begin(), I.idx_end());
|
|
|
|
SmallVector<MVT, 4> AggValueVTs;
|
|
ComputeValueVTs(TLI, AggTy, AggValueVTs);
|
|
SmallVector<MVT, 4> ValValueVTs;
|
|
ComputeValueVTs(TLI, ValTy, ValValueVTs);
|
|
|
|
unsigned NumAggValues = AggValueVTs.size();
|
|
unsigned NumValValues = ValValueVTs.size();
|
|
SmallVector<SDOperand, 4> Values(NumAggValues);
|
|
|
|
SDOperand Agg = getValue(Op0);
|
|
SDOperand Val = getValue(Op1);
|
|
unsigned i = 0;
|
|
// Copy the beginning value(s) from the original aggregate.
|
|
for (; i != LinearIndex; ++i)
|
|
Values[i] = IntoUndef ? DAG.getNode(ISD::UNDEF, AggValueVTs[i]) :
|
|
SDOperand(Agg.Val, Agg.ResNo + i);
|
|
// Copy values from the inserted value(s).
|
|
for (; i != LinearIndex + NumValValues; ++i)
|
|
Values[i] = FromUndef ? DAG.getNode(ISD::UNDEF, AggValueVTs[i]) :
|
|
SDOperand(Val.Val, Val.ResNo + i - LinearIndex);
|
|
// Copy remaining value(s) from the original aggregate.
|
|
for (; i != NumAggValues; ++i)
|
|
Values[i] = IntoUndef ? DAG.getNode(ISD::UNDEF, AggValueVTs[i]) :
|
|
SDOperand(Agg.Val, Agg.ResNo + i);
|
|
|
|
setValue(&I, DAG.getMergeValues(DAG.getVTList(&AggValueVTs[0], NumAggValues),
|
|
&Values[0], NumAggValues));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitExtractValue(ExtractValueInst &I) {
|
|
const Value *Op0 = I.getOperand(0);
|
|
const Type *AggTy = Op0->getType();
|
|
const Type *ValTy = I.getType();
|
|
bool OutOfUndef = isa<UndefValue>(Op0);
|
|
|
|
unsigned LinearIndex = ComputeLinearIndex(TLI, AggTy,
|
|
I.idx_begin(), I.idx_end());
|
|
|
|
SmallVector<MVT, 4> ValValueVTs;
|
|
ComputeValueVTs(TLI, ValTy, ValValueVTs);
|
|
|
|
unsigned NumValValues = ValValueVTs.size();
|
|
SmallVector<SDOperand, 4> Values(NumValValues);
|
|
|
|
SDOperand Agg = getValue(Op0);
|
|
// Copy out the selected value(s).
|
|
for (unsigned i = LinearIndex; i != LinearIndex + NumValValues; ++i)
|
|
Values[i - LinearIndex] =
|
|
OutOfUndef ? DAG.getNode(ISD::UNDEF, Agg.Val->getValueType(Agg.ResNo + i)) :
|
|
SDOperand(Agg.Val, Agg.ResNo + i);
|
|
|
|
setValue(&I, DAG.getMergeValues(DAG.getVTList(&ValValueVTs[0], NumValValues),
|
|
&Values[0], NumValValues));
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitGetElementPtr(User &I) {
|
|
SDOperand N = getValue(I.getOperand(0));
|
|
const Type *Ty = I.getOperand(0)->getType();
|
|
|
|
for (GetElementPtrInst::op_iterator OI = I.op_begin()+1, E = I.op_end();
|
|
OI != E; ++OI) {
|
|
Value *Idx = *OI;
|
|
if (const StructType *StTy = dyn_cast<StructType>(Ty)) {
|
|
unsigned Field = cast<ConstantInt>(Idx)->getZExtValue();
|
|
if (Field) {
|
|
// N = N + Offset
|
|
uint64_t Offset = TD->getStructLayout(StTy)->getElementOffset(Field);
|
|
N = DAG.getNode(ISD::ADD, N.getValueType(), N,
|
|
DAG.getIntPtrConstant(Offset));
|
|
}
|
|
Ty = StTy->getElementType(Field);
|
|
} else {
|
|
Ty = cast<SequentialType>(Ty)->getElementType();
|
|
|
|
// If this is a constant subscript, handle it quickly.
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) {
|
|
if (CI->getZExtValue() == 0) continue;
|
|
uint64_t Offs =
|
|
TD->getABITypeSize(Ty)*cast<ConstantInt>(CI)->getSExtValue();
|
|
N = DAG.getNode(ISD::ADD, N.getValueType(), N,
|
|
DAG.getIntPtrConstant(Offs));
|
|
continue;
|
|
}
|
|
|
|
// N = N + Idx * ElementSize;
|
|
uint64_t ElementSize = TD->getABITypeSize(Ty);
|
|
SDOperand IdxN = getValue(Idx);
|
|
|
|
// If the index is smaller or larger than intptr_t, truncate or extend
|
|
// it.
|
|
if (IdxN.getValueType().bitsLT(N.getValueType())) {
|
|
IdxN = DAG.getNode(ISD::SIGN_EXTEND, N.getValueType(), IdxN);
|
|
} else if (IdxN.getValueType().bitsGT(N.getValueType()))
|
|
IdxN = DAG.getNode(ISD::TRUNCATE, N.getValueType(), IdxN);
|
|
|
|
// If this is a multiply by a power of two, turn it into a shl
|
|
// immediately. This is a very common case.
|
|
if (isPowerOf2_64(ElementSize)) {
|
|
unsigned Amt = Log2_64(ElementSize);
|
|
IdxN = DAG.getNode(ISD::SHL, N.getValueType(), IdxN,
|
|
DAG.getConstant(Amt, TLI.getShiftAmountTy()));
|
|
N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN);
|
|
continue;
|
|
}
|
|
|
|
SDOperand Scale = DAG.getIntPtrConstant(ElementSize);
|
|
IdxN = DAG.getNode(ISD::MUL, N.getValueType(), IdxN, Scale);
|
|
N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN);
|
|
}
|
|
}
|
|
setValue(&I, N);
|
|
}
|
|
|
|
void SelectionDAGLowering::visitAlloca(AllocaInst &I) {
|
|
// If this is a fixed sized alloca in the entry block of the function,
|
|
// allocate it statically on the stack.
|
|
if (FuncInfo.StaticAllocaMap.count(&I))
|
|
return; // getValue will auto-populate this.
|
|
|
|
const Type *Ty = I.getAllocatedType();
|
|
uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
|
|
unsigned Align =
|
|
std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty),
|
|
I.getAlignment());
|
|
|
|
SDOperand AllocSize = getValue(I.getArraySize());
|
|
MVT IntPtr = TLI.getPointerTy();
|
|
if (IntPtr.bitsLT(AllocSize.getValueType()))
|
|
AllocSize = DAG.getNode(ISD::TRUNCATE, IntPtr, AllocSize);
|
|
else if (IntPtr.bitsGT(AllocSize.getValueType()))
|
|
AllocSize = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, AllocSize);
|
|
|
|
AllocSize = DAG.getNode(ISD::MUL, IntPtr, AllocSize,
|
|
DAG.getIntPtrConstant(TySize));
|
|
|
|
// Handle alignment. If the requested alignment is less than or equal to
|
|
// the stack alignment, ignore it. If the size is greater than or equal to
|
|
// the stack alignment, we note this in the DYNAMIC_STACKALLOC node.
|
|
unsigned StackAlign =
|
|
TLI.getTargetMachine().getFrameInfo()->getStackAlignment();
|
|
if (Align <= StackAlign)
|
|
Align = 0;
|
|
|
|
// Round the size of the allocation up to the stack alignment size
|
|
// by add SA-1 to the size.
|
|
AllocSize = DAG.getNode(ISD::ADD, AllocSize.getValueType(), AllocSize,
|
|
DAG.getIntPtrConstant(StackAlign-1));
|
|
// Mask out the low bits for alignment purposes.
|
|
AllocSize = DAG.getNode(ISD::AND, AllocSize.getValueType(), AllocSize,
|
|
DAG.getIntPtrConstant(~(uint64_t)(StackAlign-1)));
|
|
|
|
SDOperand Ops[] = { getRoot(), AllocSize, DAG.getIntPtrConstant(Align) };
|
|
const MVT *VTs = DAG.getNodeValueTypes(AllocSize.getValueType(),
|
|
MVT::Other);
|
|
SDOperand DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, VTs, 2, Ops, 3);
|
|
setValue(&I, DSA);
|
|
DAG.setRoot(DSA.getValue(1));
|
|
|
|
// Inform the Frame Information that we have just allocated a variable-sized
|
|
// object.
|
|
CurMBB->getParent()->getFrameInfo()->CreateVariableSizedObject();
|
|
}
|
|
|
|
void SelectionDAGLowering::visitLoad(LoadInst &I) {
|
|
const Value *SV = I.getOperand(0);
|
|
SDOperand Ptr = getValue(SV);
|
|
|
|
const Type *Ty = I.getType();
|
|
bool isVolatile = I.isVolatile();
|
|
unsigned Alignment = I.getAlignment();
|
|
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
SmallVector<uint64_t, 4> Offsets;
|
|
ComputeValueVTs(TLI, Ty, ValueVTs, &Offsets);
|
|
unsigned NumValues = ValueVTs.size();
|
|
if (NumValues == 0)
|
|
return;
|
|
|
|
SDOperand Root;
|
|
if (I.isVolatile())
|
|
Root = getRoot();
|
|
else {
|
|
// Do not serialize non-volatile loads against each other.
|
|
Root = DAG.getRoot();
|
|
}
|
|
|
|
SmallVector<SDOperand, 4> Values(NumValues);
|
|
SmallVector<SDOperand, 4> Chains(NumValues);
|
|
MVT PtrVT = Ptr.getValueType();
|
|
for (unsigned i = 0; i != NumValues; ++i) {
|
|
SDOperand L = DAG.getLoad(ValueVTs[i], Root,
|
|
DAG.getNode(ISD::ADD, PtrVT, Ptr,
|
|
DAG.getConstant(Offsets[i], PtrVT)),
|
|
SV, Offsets[i],
|
|
isVolatile, Alignment);
|
|
Values[i] = L;
|
|
Chains[i] = L.getValue(1);
|
|
}
|
|
|
|
SDOperand Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
|
|
&Chains[0], NumValues);
|
|
if (isVolatile)
|
|
DAG.setRoot(Chain);
|
|
else
|
|
PendingLoads.push_back(Chain);
|
|
|
|
setValue(&I, DAG.getMergeValues(DAG.getVTList(&ValueVTs[0], NumValues),
|
|
&Values[0], NumValues));
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitStore(StoreInst &I) {
|
|
Value *SrcV = I.getOperand(0);
|
|
SDOperand Src = getValue(SrcV);
|
|
Value *PtrV = I.getOperand(1);
|
|
SDOperand Ptr = getValue(PtrV);
|
|
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
SmallVector<uint64_t, 4> Offsets;
|
|
ComputeValueVTs(TLI, SrcV->getType(), ValueVTs, &Offsets);
|
|
unsigned NumValues = ValueVTs.size();
|
|
if (NumValues == 0)
|
|
return;
|
|
|
|
SDOperand Root = getRoot();
|
|
SmallVector<SDOperand, 4> Chains(NumValues);
|
|
MVT PtrVT = Ptr.getValueType();
|
|
bool isVolatile = I.isVolatile();
|
|
unsigned Alignment = I.getAlignment();
|
|
for (unsigned i = 0; i != NumValues; ++i)
|
|
Chains[i] = DAG.getStore(Root, SDOperand(Src.Val, Src.ResNo + i),
|
|
DAG.getNode(ISD::ADD, PtrVT, Ptr,
|
|
DAG.getConstant(Offsets[i], PtrVT)),
|
|
PtrV, Offsets[i],
|
|
isVolatile, Alignment);
|
|
|
|
DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, &Chains[0], NumValues));
|
|
}
|
|
|
|
/// visitTargetIntrinsic - Lower a call of a target intrinsic to an INTRINSIC
|
|
/// node.
|
|
void SelectionDAGLowering::visitTargetIntrinsic(CallInst &I,
|
|
unsigned Intrinsic) {
|
|
bool HasChain = !I.doesNotAccessMemory();
|
|
bool OnlyLoad = HasChain && I.onlyReadsMemory();
|
|
|
|
// Build the operand list.
|
|
SmallVector<SDOperand, 8> Ops;
|
|
if (HasChain) { // If this intrinsic has side-effects, chainify it.
|
|
if (OnlyLoad) {
|
|
// We don't need to serialize loads against other loads.
|
|
Ops.push_back(DAG.getRoot());
|
|
} else {
|
|
Ops.push_back(getRoot());
|
|
}
|
|
}
|
|
|
|
// Add the intrinsic ID as an integer operand.
|
|
Ops.push_back(DAG.getConstant(Intrinsic, TLI.getPointerTy()));
|
|
|
|
// Add all operands of the call to the operand list.
|
|
for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) {
|
|
SDOperand Op = getValue(I.getOperand(i));
|
|
assert(TLI.isTypeLegal(Op.getValueType()) &&
|
|
"Intrinsic uses a non-legal type?");
|
|
Ops.push_back(Op);
|
|
}
|
|
|
|
std::vector<MVT> VTs;
|
|
if (I.getType() != Type::VoidTy) {
|
|
MVT VT = TLI.getValueType(I.getType());
|
|
if (VT.isVector()) {
|
|
const VectorType *DestTy = cast<VectorType>(I.getType());
|
|
MVT EltVT = TLI.getValueType(DestTy->getElementType());
|
|
|
|
VT = MVT::getVectorVT(EltVT, DestTy->getNumElements());
|
|
assert(VT != MVT::Other && "Intrinsic uses a non-legal type?");
|
|
}
|
|
|
|
assert(TLI.isTypeLegal(VT) && "Intrinsic uses a non-legal type?");
|
|
VTs.push_back(VT);
|
|
}
|
|
if (HasChain)
|
|
VTs.push_back(MVT::Other);
|
|
|
|
const MVT *VTList = DAG.getNodeValueTypes(VTs);
|
|
|
|
// Create the node.
|
|
SDOperand Result;
|
|
if (!HasChain)
|
|
Result = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, VTList, VTs.size(),
|
|
&Ops[0], Ops.size());
|
|
else if (I.getType() != Type::VoidTy)
|
|
Result = DAG.getNode(ISD::INTRINSIC_W_CHAIN, VTList, VTs.size(),
|
|
&Ops[0], Ops.size());
|
|
else
|
|
Result = DAG.getNode(ISD::INTRINSIC_VOID, VTList, VTs.size(),
|
|
&Ops[0], Ops.size());
|
|
|
|
if (HasChain) {
|
|
SDOperand Chain = Result.getValue(Result.Val->getNumValues()-1);
|
|
if (OnlyLoad)
|
|
PendingLoads.push_back(Chain);
|
|
else
|
|
DAG.setRoot(Chain);
|
|
}
|
|
if (I.getType() != Type::VoidTy) {
|
|
if (const VectorType *PTy = dyn_cast<VectorType>(I.getType())) {
|
|
MVT VT = TLI.getValueType(PTy);
|
|
Result = DAG.getNode(ISD::BIT_CONVERT, VT, Result);
|
|
}
|
|
setValue(&I, Result);
|
|
}
|
|
}
|
|
|
|
/// ExtractTypeInfo - Returns the type info, possibly bitcast, encoded in V.
|
|
static GlobalVariable *ExtractTypeInfo (Value *V) {
|
|
V = V->stripPointerCasts();
|
|
GlobalVariable *GV = dyn_cast<GlobalVariable>(V);
|
|
assert ((GV || isa<ConstantPointerNull>(V)) &&
|
|
"TypeInfo must be a global variable or NULL");
|
|
return GV;
|
|
}
|
|
|
|
/// addCatchInfo - Extract the personality and type infos from an eh.selector
|
|
/// call, and add them to the specified machine basic block.
|
|
static void addCatchInfo(CallInst &I, MachineModuleInfo *MMI,
|
|
MachineBasicBlock *MBB) {
|
|
// Inform the MachineModuleInfo of the personality for this landing pad.
|
|
ConstantExpr *CE = cast<ConstantExpr>(I.getOperand(2));
|
|
assert(CE->getOpcode() == Instruction::BitCast &&
|
|
isa<Function>(CE->getOperand(0)) &&
|
|
"Personality should be a function");
|
|
MMI->addPersonality(MBB, cast<Function>(CE->getOperand(0)));
|
|
|
|
// Gather all the type infos for this landing pad and pass them along to
|
|
// MachineModuleInfo.
|
|
std::vector<GlobalVariable *> TyInfo;
|
|
unsigned N = I.getNumOperands();
|
|
|
|
for (unsigned i = N - 1; i > 2; --i) {
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand(i))) {
|
|
unsigned FilterLength = CI->getZExtValue();
|
|
unsigned FirstCatch = i + FilterLength + !FilterLength;
|
|
assert (FirstCatch <= N && "Invalid filter length");
|
|
|
|
if (FirstCatch < N) {
|
|
TyInfo.reserve(N - FirstCatch);
|
|
for (unsigned j = FirstCatch; j < N; ++j)
|
|
TyInfo.push_back(ExtractTypeInfo(I.getOperand(j)));
|
|
MMI->addCatchTypeInfo(MBB, TyInfo);
|
|
TyInfo.clear();
|
|
}
|
|
|
|
if (!FilterLength) {
|
|
// Cleanup.
|
|
MMI->addCleanup(MBB);
|
|
} else {
|
|
// Filter.
|
|
TyInfo.reserve(FilterLength - 1);
|
|
for (unsigned j = i + 1; j < FirstCatch; ++j)
|
|
TyInfo.push_back(ExtractTypeInfo(I.getOperand(j)));
|
|
MMI->addFilterTypeInfo(MBB, TyInfo);
|
|
TyInfo.clear();
|
|
}
|
|
|
|
N = i;
|
|
}
|
|
}
|
|
|
|
if (N > 3) {
|
|
TyInfo.reserve(N - 3);
|
|
for (unsigned j = 3; j < N; ++j)
|
|
TyInfo.push_back(ExtractTypeInfo(I.getOperand(j)));
|
|
MMI->addCatchTypeInfo(MBB, TyInfo);
|
|
}
|
|
}
|
|
|
|
|
|
/// Inlined utility function to implement binary input atomic intrinsics for
|
|
// visitIntrinsicCall: I is a call instruction
|
|
// Op is the associated NodeType for I
|
|
const char *
|
|
SelectionDAGLowering::implVisitBinaryAtomic(CallInst& I, ISD::NodeType Op) {
|
|
SDOperand Root = getRoot();
|
|
SDOperand L = DAG.getAtomic(Op, Root,
|
|
getValue(I.getOperand(1)),
|
|
getValue(I.getOperand(2)),
|
|
I.getOperand(1));
|
|
setValue(&I, L);
|
|
DAG.setRoot(L.getValue(1));
|
|
return 0;
|
|
}
|
|
|
|
/// visitIntrinsicCall - Lower the call to the specified intrinsic function. If
|
|
/// we want to emit this as a call to a named external function, return the name
|
|
/// otherwise lower it and return null.
|
|
const char *
|
|
SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
|
|
switch (Intrinsic) {
|
|
default:
|
|
// By default, turn this into a target intrinsic node.
|
|
visitTargetIntrinsic(I, Intrinsic);
|
|
return 0;
|
|
case Intrinsic::vastart: visitVAStart(I); return 0;
|
|
case Intrinsic::vaend: visitVAEnd(I); return 0;
|
|
case Intrinsic::vacopy: visitVACopy(I); return 0;
|
|
case Intrinsic::returnaddress:
|
|
setValue(&I, DAG.getNode(ISD::RETURNADDR, TLI.getPointerTy(),
|
|
getValue(I.getOperand(1))));
|
|
return 0;
|
|
case Intrinsic::frameaddress:
|
|
setValue(&I, DAG.getNode(ISD::FRAMEADDR, TLI.getPointerTy(),
|
|
getValue(I.getOperand(1))));
|
|
return 0;
|
|
case Intrinsic::setjmp:
|
|
return "_setjmp"+!TLI.usesUnderscoreSetJmp();
|
|
break;
|
|
case Intrinsic::longjmp:
|
|
return "_longjmp"+!TLI.usesUnderscoreLongJmp();
|
|
break;
|
|
case Intrinsic::memcpy_i32:
|
|
case Intrinsic::memcpy_i64: {
|
|
SDOperand Op1 = getValue(I.getOperand(1));
|
|
SDOperand Op2 = getValue(I.getOperand(2));
|
|
SDOperand Op3 = getValue(I.getOperand(3));
|
|
unsigned Align = cast<ConstantInt>(I.getOperand(4))->getZExtValue();
|
|
DAG.setRoot(DAG.getMemcpy(getRoot(), Op1, Op2, Op3, Align, false,
|
|
I.getOperand(1), 0, I.getOperand(2), 0));
|
|
return 0;
|
|
}
|
|
case Intrinsic::memset_i32:
|
|
case Intrinsic::memset_i64: {
|
|
SDOperand Op1 = getValue(I.getOperand(1));
|
|
SDOperand Op2 = getValue(I.getOperand(2));
|
|
SDOperand Op3 = getValue(I.getOperand(3));
|
|
unsigned Align = cast<ConstantInt>(I.getOperand(4))->getZExtValue();
|
|
DAG.setRoot(DAG.getMemset(getRoot(), Op1, Op2, Op3, Align,
|
|
I.getOperand(1), 0));
|
|
return 0;
|
|
}
|
|
case Intrinsic::memmove_i32:
|
|
case Intrinsic::memmove_i64: {
|
|
SDOperand Op1 = getValue(I.getOperand(1));
|
|
SDOperand Op2 = getValue(I.getOperand(2));
|
|
SDOperand Op3 = getValue(I.getOperand(3));
|
|
unsigned Align = cast<ConstantInt>(I.getOperand(4))->getZExtValue();
|
|
|
|
// If the source and destination are known to not be aliases, we can
|
|
// lower memmove as memcpy.
|
|
uint64_t Size = -1ULL;
|
|
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op3))
|
|
Size = C->getValue();
|
|
if (AA.alias(I.getOperand(1), Size, I.getOperand(2), Size) ==
|
|
AliasAnalysis::NoAlias) {
|
|
DAG.setRoot(DAG.getMemcpy(getRoot(), Op1, Op2, Op3, Align, false,
|
|
I.getOperand(1), 0, I.getOperand(2), 0));
|
|
return 0;
|
|
}
|
|
|
|
DAG.setRoot(DAG.getMemmove(getRoot(), Op1, Op2, Op3, Align,
|
|
I.getOperand(1), 0, I.getOperand(2), 0));
|
|
return 0;
|
|
}
|
|
case Intrinsic::dbg_stoppoint: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
|
|
if (MMI && SPI.getContext() && MMI->Verify(SPI.getContext())) {
|
|
DebugInfoDesc *DD = MMI->getDescFor(SPI.getContext());
|
|
assert(DD && "Not a debug information descriptor");
|
|
DAG.setRoot(DAG.getDbgStopPoint(getRoot(),
|
|
SPI.getLine(),
|
|
SPI.getColumn(),
|
|
cast<CompileUnitDesc>(DD)));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
case Intrinsic::dbg_region_start: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
DbgRegionStartInst &RSI = cast<DbgRegionStartInst>(I);
|
|
if (MMI && RSI.getContext() && MMI->Verify(RSI.getContext())) {
|
|
unsigned LabelID = MMI->RecordRegionStart(RSI.getContext());
|
|
DAG.setRoot(DAG.getLabel(ISD::DBG_LABEL, getRoot(), LabelID));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
case Intrinsic::dbg_region_end: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
DbgRegionEndInst &REI = cast<DbgRegionEndInst>(I);
|
|
if (MMI && REI.getContext() && MMI->Verify(REI.getContext())) {
|
|
unsigned LabelID = MMI->RecordRegionEnd(REI.getContext());
|
|
DAG.setRoot(DAG.getLabel(ISD::DBG_LABEL, getRoot(), LabelID));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
case Intrinsic::dbg_func_start: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
if (!MMI) return 0;
|
|
DbgFuncStartInst &FSI = cast<DbgFuncStartInst>(I);
|
|
Value *SP = FSI.getSubprogram();
|
|
if (SP && MMI->Verify(SP)) {
|
|
// llvm.dbg.func.start implicitly defines a dbg_stoppoint which is
|
|
// what (most?) gdb expects.
|
|
DebugInfoDesc *DD = MMI->getDescFor(SP);
|
|
assert(DD && "Not a debug information descriptor");
|
|
SubprogramDesc *Subprogram = cast<SubprogramDesc>(DD);
|
|
const CompileUnitDesc *CompileUnit = Subprogram->getFile();
|
|
unsigned SrcFile = MMI->RecordSource(CompileUnit);
|
|
// Record the source line but does create a label. It will be emitted
|
|
// at asm emission time.
|
|
MMI->RecordSourceLine(Subprogram->getLine(), 0, SrcFile);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
case Intrinsic::dbg_declare: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
DbgDeclareInst &DI = cast<DbgDeclareInst>(I);
|
|
Value *Variable = DI.getVariable();
|
|
if (MMI && Variable && MMI->Verify(Variable))
|
|
DAG.setRoot(DAG.getNode(ISD::DECLARE, MVT::Other, getRoot(),
|
|
getValue(DI.getAddress()), getValue(Variable)));
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::eh_exception: {
|
|
if (!CurMBB->isLandingPad()) {
|
|
// FIXME: Mark exception register as live in. Hack for PR1508.
|
|
unsigned Reg = TLI.getExceptionAddressRegister();
|
|
if (Reg) CurMBB->addLiveIn(Reg);
|
|
}
|
|
// Insert the EXCEPTIONADDR instruction.
|
|
SDVTList VTs = DAG.getVTList(TLI.getPointerTy(), MVT::Other);
|
|
SDOperand Ops[1];
|
|
Ops[0] = DAG.getRoot();
|
|
SDOperand Op = DAG.getNode(ISD::EXCEPTIONADDR, VTs, Ops, 1);
|
|
setValue(&I, Op);
|
|
DAG.setRoot(Op.getValue(1));
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::eh_selector_i32:
|
|
case Intrinsic::eh_selector_i64: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
MVT VT = (Intrinsic == Intrinsic::eh_selector_i32 ?
|
|
MVT::i32 : MVT::i64);
|
|
|
|
if (MMI) {
|
|
if (CurMBB->isLandingPad())
|
|
addCatchInfo(I, MMI, CurMBB);
|
|
else {
|
|
#ifndef NDEBUG
|
|
FuncInfo.CatchInfoLost.insert(&I);
|
|
#endif
|
|
// FIXME: Mark exception selector register as live in. Hack for PR1508.
|
|
unsigned Reg = TLI.getExceptionSelectorRegister();
|
|
if (Reg) CurMBB->addLiveIn(Reg);
|
|
}
|
|
|
|
// Insert the EHSELECTION instruction.
|
|
SDVTList VTs = DAG.getVTList(VT, MVT::Other);
|
|
SDOperand Ops[2];
|
|
Ops[0] = getValue(I.getOperand(1));
|
|
Ops[1] = getRoot();
|
|
SDOperand Op = DAG.getNode(ISD::EHSELECTION, VTs, Ops, 2);
|
|
setValue(&I, Op);
|
|
DAG.setRoot(Op.getValue(1));
|
|
} else {
|
|
setValue(&I, DAG.getConstant(0, VT));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::eh_typeid_for_i32:
|
|
case Intrinsic::eh_typeid_for_i64: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
MVT VT = (Intrinsic == Intrinsic::eh_typeid_for_i32 ?
|
|
MVT::i32 : MVT::i64);
|
|
|
|
if (MMI) {
|
|
// Find the type id for the given typeinfo.
|
|
GlobalVariable *GV = ExtractTypeInfo(I.getOperand(1));
|
|
|
|
unsigned TypeID = MMI->getTypeIDFor(GV);
|
|
setValue(&I, DAG.getConstant(TypeID, VT));
|
|
} else {
|
|
// Return something different to eh_selector.
|
|
setValue(&I, DAG.getConstant(1, VT));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::eh_return: {
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
|
|
if (MMI) {
|
|
MMI->setCallsEHReturn(true);
|
|
DAG.setRoot(DAG.getNode(ISD::EH_RETURN,
|
|
MVT::Other,
|
|
getControlRoot(),
|
|
getValue(I.getOperand(1)),
|
|
getValue(I.getOperand(2))));
|
|
} else {
|
|
setValue(&I, DAG.getConstant(0, TLI.getPointerTy()));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::eh_unwind_init: {
|
|
if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo()) {
|
|
MMI->setCallsUnwindInit(true);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::eh_dwarf_cfa: {
|
|
MVT VT = getValue(I.getOperand(1)).getValueType();
|
|
SDOperand CfaArg;
|
|
if (VT.bitsGT(TLI.getPointerTy()))
|
|
CfaArg = DAG.getNode(ISD::TRUNCATE,
|
|
TLI.getPointerTy(), getValue(I.getOperand(1)));
|
|
else
|
|
CfaArg = DAG.getNode(ISD::SIGN_EXTEND,
|
|
TLI.getPointerTy(), getValue(I.getOperand(1)));
|
|
|
|
SDOperand Offset = DAG.getNode(ISD::ADD,
|
|
TLI.getPointerTy(),
|
|
DAG.getNode(ISD::FRAME_TO_ARGS_OFFSET,
|
|
TLI.getPointerTy()),
|
|
CfaArg);
|
|
setValue(&I, DAG.getNode(ISD::ADD,
|
|
TLI.getPointerTy(),
|
|
DAG.getNode(ISD::FRAMEADDR,
|
|
TLI.getPointerTy(),
|
|
DAG.getConstant(0,
|
|
TLI.getPointerTy())),
|
|
Offset));
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::sqrt:
|
|
setValue(&I, DAG.getNode(ISD::FSQRT,
|
|
getValue(I.getOperand(1)).getValueType(),
|
|
getValue(I.getOperand(1))));
|
|
return 0;
|
|
case Intrinsic::powi:
|
|
setValue(&I, DAG.getNode(ISD::FPOWI,
|
|
getValue(I.getOperand(1)).getValueType(),
|
|
getValue(I.getOperand(1)),
|
|
getValue(I.getOperand(2))));
|
|
return 0;
|
|
case Intrinsic::sin:
|
|
setValue(&I, DAG.getNode(ISD::FSIN,
|
|
getValue(I.getOperand(1)).getValueType(),
|
|
getValue(I.getOperand(1))));
|
|
return 0;
|
|
case Intrinsic::cos:
|
|
setValue(&I, DAG.getNode(ISD::FCOS,
|
|
getValue(I.getOperand(1)).getValueType(),
|
|
getValue(I.getOperand(1))));
|
|
return 0;
|
|
case Intrinsic::pow:
|
|
setValue(&I, DAG.getNode(ISD::FPOW,
|
|
getValue(I.getOperand(1)).getValueType(),
|
|
getValue(I.getOperand(1)),
|
|
getValue(I.getOperand(2))));
|
|
return 0;
|
|
case Intrinsic::pcmarker: {
|
|
SDOperand Tmp = getValue(I.getOperand(1));
|
|
DAG.setRoot(DAG.getNode(ISD::PCMARKER, MVT::Other, getRoot(), Tmp));
|
|
return 0;
|
|
}
|
|
case Intrinsic::readcyclecounter: {
|
|
SDOperand Op = getRoot();
|
|
SDOperand Tmp = DAG.getNode(ISD::READCYCLECOUNTER,
|
|
DAG.getNodeValueTypes(MVT::i64, MVT::Other), 2,
|
|
&Op, 1);
|
|
setValue(&I, Tmp);
|
|
DAG.setRoot(Tmp.getValue(1));
|
|
return 0;
|
|
}
|
|
case Intrinsic::part_select: {
|
|
// Currently not implemented: just abort
|
|
assert(0 && "part_select intrinsic not implemented");
|
|
abort();
|
|
}
|
|
case Intrinsic::part_set: {
|
|
// Currently not implemented: just abort
|
|
assert(0 && "part_set intrinsic not implemented");
|
|
abort();
|
|
}
|
|
case Intrinsic::bswap:
|
|
setValue(&I, DAG.getNode(ISD::BSWAP,
|
|
getValue(I.getOperand(1)).getValueType(),
|
|
getValue(I.getOperand(1))));
|
|
return 0;
|
|
case Intrinsic::cttz: {
|
|
SDOperand Arg = getValue(I.getOperand(1));
|
|
MVT Ty = Arg.getValueType();
|
|
SDOperand result = DAG.getNode(ISD::CTTZ, Ty, Arg);
|
|
setValue(&I, result);
|
|
return 0;
|
|
}
|
|
case Intrinsic::ctlz: {
|
|
SDOperand Arg = getValue(I.getOperand(1));
|
|
MVT Ty = Arg.getValueType();
|
|
SDOperand result = DAG.getNode(ISD::CTLZ, Ty, Arg);
|
|
setValue(&I, result);
|
|
return 0;
|
|
}
|
|
case Intrinsic::ctpop: {
|
|
SDOperand Arg = getValue(I.getOperand(1));
|
|
MVT Ty = Arg.getValueType();
|
|
SDOperand result = DAG.getNode(ISD::CTPOP, Ty, Arg);
|
|
setValue(&I, result);
|
|
return 0;
|
|
}
|
|
case Intrinsic::stacksave: {
|
|
SDOperand Op = getRoot();
|
|
SDOperand Tmp = DAG.getNode(ISD::STACKSAVE,
|
|
DAG.getNodeValueTypes(TLI.getPointerTy(), MVT::Other), 2, &Op, 1);
|
|
setValue(&I, Tmp);
|
|
DAG.setRoot(Tmp.getValue(1));
|
|
return 0;
|
|
}
|
|
case Intrinsic::stackrestore: {
|
|
SDOperand Tmp = getValue(I.getOperand(1));
|
|
DAG.setRoot(DAG.getNode(ISD::STACKRESTORE, MVT::Other, getRoot(), Tmp));
|
|
return 0;
|
|
}
|
|
case Intrinsic::var_annotation:
|
|
// Discard annotate attributes
|
|
return 0;
|
|
|
|
case Intrinsic::init_trampoline: {
|
|
const Function *F = cast<Function>(I.getOperand(2)->stripPointerCasts());
|
|
|
|
SDOperand Ops[6];
|
|
Ops[0] = getRoot();
|
|
Ops[1] = getValue(I.getOperand(1));
|
|
Ops[2] = getValue(I.getOperand(2));
|
|
Ops[3] = getValue(I.getOperand(3));
|
|
Ops[4] = DAG.getSrcValue(I.getOperand(1));
|
|
Ops[5] = DAG.getSrcValue(F);
|
|
|
|
SDOperand Tmp = DAG.getNode(ISD::TRAMPOLINE,
|
|
DAG.getNodeValueTypes(TLI.getPointerTy(),
|
|
MVT::Other), 2,
|
|
Ops, 6);
|
|
|
|
setValue(&I, Tmp);
|
|
DAG.setRoot(Tmp.getValue(1));
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::gcroot:
|
|
if (GCI) {
|
|
Value *Alloca = I.getOperand(1);
|
|
Constant *TypeMap = cast<Constant>(I.getOperand(2));
|
|
|
|
FrameIndexSDNode *FI = cast<FrameIndexSDNode>(getValue(Alloca).Val);
|
|
GCI->addStackRoot(FI->getIndex(), TypeMap);
|
|
}
|
|
return 0;
|
|
|
|
case Intrinsic::gcread:
|
|
case Intrinsic::gcwrite:
|
|
assert(0 && "Collector failed to lower gcread/gcwrite intrinsics!");
|
|
return 0;
|
|
|
|
case Intrinsic::flt_rounds: {
|
|
setValue(&I, DAG.getNode(ISD::FLT_ROUNDS_, MVT::i32));
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::trap: {
|
|
DAG.setRoot(DAG.getNode(ISD::TRAP, MVT::Other, getRoot()));
|
|
return 0;
|
|
}
|
|
case Intrinsic::prefetch: {
|
|
SDOperand Ops[4];
|
|
Ops[0] = getRoot();
|
|
Ops[1] = getValue(I.getOperand(1));
|
|
Ops[2] = getValue(I.getOperand(2));
|
|
Ops[3] = getValue(I.getOperand(3));
|
|
DAG.setRoot(DAG.getNode(ISD::PREFETCH, MVT::Other, &Ops[0], 4));
|
|
return 0;
|
|
}
|
|
|
|
case Intrinsic::memory_barrier: {
|
|
SDOperand Ops[6];
|
|
Ops[0] = getRoot();
|
|
for (int x = 1; x < 6; ++x)
|
|
Ops[x] = getValue(I.getOperand(x));
|
|
|
|
DAG.setRoot(DAG.getNode(ISD::MEMBARRIER, MVT::Other, &Ops[0], 6));
|
|
return 0;
|
|
}
|
|
case Intrinsic::atomic_cmp_swap: {
|
|
SDOperand Root = getRoot();
|
|
SDOperand L = DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, Root,
|
|
getValue(I.getOperand(1)),
|
|
getValue(I.getOperand(2)),
|
|
getValue(I.getOperand(3)),
|
|
I.getOperand(1));
|
|
setValue(&I, L);
|
|
DAG.setRoot(L.getValue(1));
|
|
return 0;
|
|
}
|
|
case Intrinsic::atomic_load_add:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_ADD);
|
|
case Intrinsic::atomic_load_sub:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_SUB);
|
|
case Intrinsic::atomic_load_and:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_AND);
|
|
case Intrinsic::atomic_load_or:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_OR);
|
|
case Intrinsic::atomic_load_xor:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_XOR);
|
|
case Intrinsic::atomic_load_nand:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_NAND);
|
|
case Intrinsic::atomic_load_min:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_MIN);
|
|
case Intrinsic::atomic_load_max:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_MAX);
|
|
case Intrinsic::atomic_load_umin:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_UMIN);
|
|
case Intrinsic::atomic_load_umax:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_LOAD_UMAX);
|
|
case Intrinsic::atomic_swap:
|
|
return implVisitBinaryAtomic(I, ISD::ATOMIC_SWAP);
|
|
}
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::LowerCallTo(CallSite CS, SDOperand Callee,
|
|
bool IsTailCall,
|
|
MachineBasicBlock *LandingPad) {
|
|
const PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
|
|
const FunctionType *FTy = cast<FunctionType>(PT->getElementType());
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
unsigned BeginLabel = 0, EndLabel = 0;
|
|
|
|
TargetLowering::ArgListTy Args;
|
|
TargetLowering::ArgListEntry Entry;
|
|
Args.reserve(CS.arg_size());
|
|
for (CallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
|
|
i != e; ++i) {
|
|
SDOperand ArgNode = getValue(*i);
|
|
Entry.Node = ArgNode; Entry.Ty = (*i)->getType();
|
|
|
|
unsigned attrInd = i - CS.arg_begin() + 1;
|
|
Entry.isSExt = CS.paramHasAttr(attrInd, ParamAttr::SExt);
|
|
Entry.isZExt = CS.paramHasAttr(attrInd, ParamAttr::ZExt);
|
|
Entry.isInReg = CS.paramHasAttr(attrInd, ParamAttr::InReg);
|
|
Entry.isSRet = CS.paramHasAttr(attrInd, ParamAttr::StructRet);
|
|
Entry.isNest = CS.paramHasAttr(attrInd, ParamAttr::Nest);
|
|
Entry.isByVal = CS.paramHasAttr(attrInd, ParamAttr::ByVal);
|
|
Entry.Alignment = CS.getParamAlignment(attrInd);
|
|
Args.push_back(Entry);
|
|
}
|
|
|
|
if (LandingPad && MMI) {
|
|
// Insert a label before the invoke call to mark the try range. This can be
|
|
// used to detect deletion of the invoke via the MachineModuleInfo.
|
|
BeginLabel = MMI->NextLabelID();
|
|
// Both PendingLoads and PendingExports must be flushed here;
|
|
// this call might not return.
|
|
(void)getRoot();
|
|
DAG.setRoot(DAG.getLabel(ISD::EH_LABEL, getControlRoot(), BeginLabel));
|
|
}
|
|
|
|
std::pair<SDOperand,SDOperand> Result =
|
|
TLI.LowerCallTo(getRoot(), CS.getType(),
|
|
CS.paramHasAttr(0, ParamAttr::SExt),
|
|
CS.paramHasAttr(0, ParamAttr::ZExt),
|
|
FTy->isVarArg(), CS.getCallingConv(), IsTailCall,
|
|
Callee, Args, DAG);
|
|
if (CS.getType() != Type::VoidTy)
|
|
setValue(CS.getInstruction(), Result.first);
|
|
DAG.setRoot(Result.second);
|
|
|
|
if (LandingPad && MMI) {
|
|
// Insert a label at the end of the invoke call to mark the try range. This
|
|
// can be used to detect deletion of the invoke via the MachineModuleInfo.
|
|
EndLabel = MMI->NextLabelID();
|
|
DAG.setRoot(DAG.getLabel(ISD::EH_LABEL, getRoot(), EndLabel));
|
|
|
|
// Inform MachineModuleInfo of range.
|
|
MMI->addInvoke(LandingPad, BeginLabel, EndLabel);
|
|
}
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitCall(CallInst &I) {
|
|
const char *RenameFn = 0;
|
|
if (Function *F = I.getCalledFunction()) {
|
|
if (F->isDeclaration()) {
|
|
if (unsigned IID = F->getIntrinsicID()) {
|
|
RenameFn = visitIntrinsicCall(I, IID);
|
|
if (!RenameFn)
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Check for well-known libc/libm calls. If the function is internal, it
|
|
// can't be a library call.
|
|
unsigned NameLen = F->getNameLen();
|
|
if (!F->hasInternalLinkage() && NameLen) {
|
|
const char *NameStr = F->getNameStart();
|
|
if (NameStr[0] == 'c' &&
|
|
((NameLen == 8 && !strcmp(NameStr, "copysign")) ||
|
|
(NameLen == 9 && !strcmp(NameStr, "copysignf")))) {
|
|
if (I.getNumOperands() == 3 && // Basic sanity checks.
|
|
I.getOperand(1)->getType()->isFloatingPoint() &&
|
|
I.getType() == I.getOperand(1)->getType() &&
|
|
I.getType() == I.getOperand(2)->getType()) {
|
|
SDOperand LHS = getValue(I.getOperand(1));
|
|
SDOperand RHS = getValue(I.getOperand(2));
|
|
setValue(&I, DAG.getNode(ISD::FCOPYSIGN, LHS.getValueType(),
|
|
LHS, RHS));
|
|
return;
|
|
}
|
|
} else if (NameStr[0] == 'f' &&
|
|
((NameLen == 4 && !strcmp(NameStr, "fabs")) ||
|
|
(NameLen == 5 && !strcmp(NameStr, "fabsf")) ||
|
|
(NameLen == 5 && !strcmp(NameStr, "fabsl")))) {
|
|
if (I.getNumOperands() == 2 && // Basic sanity checks.
|
|
I.getOperand(1)->getType()->isFloatingPoint() &&
|
|
I.getType() == I.getOperand(1)->getType()) {
|
|
SDOperand Tmp = getValue(I.getOperand(1));
|
|
setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp));
|
|
return;
|
|
}
|
|
} else if (NameStr[0] == 's' &&
|
|
((NameLen == 3 && !strcmp(NameStr, "sin")) ||
|
|
(NameLen == 4 && !strcmp(NameStr, "sinf")) ||
|
|
(NameLen == 4 && !strcmp(NameStr, "sinl")))) {
|
|
if (I.getNumOperands() == 2 && // Basic sanity checks.
|
|
I.getOperand(1)->getType()->isFloatingPoint() &&
|
|
I.getType() == I.getOperand(1)->getType()) {
|
|
SDOperand Tmp = getValue(I.getOperand(1));
|
|
setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp));
|
|
return;
|
|
}
|
|
} else if (NameStr[0] == 'c' &&
|
|
((NameLen == 3 && !strcmp(NameStr, "cos")) ||
|
|
(NameLen == 4 && !strcmp(NameStr, "cosf")) ||
|
|
(NameLen == 4 && !strcmp(NameStr, "cosl")))) {
|
|
if (I.getNumOperands() == 2 && // Basic sanity checks.
|
|
I.getOperand(1)->getType()->isFloatingPoint() &&
|
|
I.getType() == I.getOperand(1)->getType()) {
|
|
SDOperand Tmp = getValue(I.getOperand(1));
|
|
setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
} else if (isa<InlineAsm>(I.getOperand(0))) {
|
|
visitInlineAsm(&I);
|
|
return;
|
|
}
|
|
|
|
SDOperand Callee;
|
|
if (!RenameFn)
|
|
Callee = getValue(I.getOperand(0));
|
|
else
|
|
Callee = DAG.getExternalSymbol(RenameFn, TLI.getPointerTy());
|
|
|
|
LowerCallTo(&I, Callee, I.isTailCall());
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitGetResult(GetResultInst &I) {
|
|
if (isa<UndefValue>(I.getOperand(0))) {
|
|
SDOperand Undef = DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()));
|
|
setValue(&I, Undef);
|
|
return;
|
|
}
|
|
|
|
// To add support for individual return values with aggregate types,
|
|
// we'd need a way to take a getresult index and determine which
|
|
// values of the Call SDNode are associated with it.
|
|
assert(TLI.getValueType(I.getType(), true) != MVT::Other &&
|
|
"Individual return values must not be aggregates!");
|
|
|
|
SDOperand Call = getValue(I.getOperand(0));
|
|
setValue(&I, SDOperand(Call.Val, I.getIndex()));
|
|
}
|
|
|
|
|
|
/// getCopyFromRegs - Emit a series of CopyFromReg nodes that copies from
|
|
/// this value and returns the result as a ValueVT value. This uses
|
|
/// Chain/Flag as the input and updates them for the output Chain/Flag.
|
|
/// If the Flag pointer is NULL, no flag is used.
|
|
SDOperand RegsForValue::getCopyFromRegs(SelectionDAG &DAG,
|
|
SDOperand &Chain,
|
|
SDOperand *Flag) const {
|
|
// Assemble the legal parts into the final values.
|
|
SmallVector<SDOperand, 4> Values(ValueVTs.size());
|
|
SmallVector<SDOperand, 8> Parts;
|
|
for (unsigned Value = 0, Part = 0, e = ValueVTs.size(); Value != e; ++Value) {
|
|
// Copy the legal parts from the registers.
|
|
MVT ValueVT = ValueVTs[Value];
|
|
unsigned NumRegs = TLI->getNumRegisters(ValueVT);
|
|
MVT RegisterVT = RegVTs[Value];
|
|
|
|
Parts.resize(NumRegs);
|
|
for (unsigned i = 0; i != NumRegs; ++i) {
|
|
SDOperand P;
|
|
if (Flag == 0)
|
|
P = DAG.getCopyFromReg(Chain, Regs[Part+i], RegisterVT);
|
|
else {
|
|
P = DAG.getCopyFromReg(Chain, Regs[Part+i], RegisterVT, *Flag);
|
|
*Flag = P.getValue(2);
|
|
}
|
|
Chain = P.getValue(1);
|
|
|
|
// If the source register was virtual and if we know something about it,
|
|
// add an assert node.
|
|
if (TargetRegisterInfo::isVirtualRegister(Regs[Part+i]) &&
|
|
RegisterVT.isInteger() && !RegisterVT.isVector()) {
|
|
unsigned SlotNo = Regs[Part+i]-TargetRegisterInfo::FirstVirtualRegister;
|
|
FunctionLoweringInfo &FLI = DAG.getFunctionLoweringInfo();
|
|
if (FLI.LiveOutRegInfo.size() > SlotNo) {
|
|
FunctionLoweringInfo::LiveOutInfo &LOI = FLI.LiveOutRegInfo[SlotNo];
|
|
|
|
unsigned RegSize = RegisterVT.getSizeInBits();
|
|
unsigned NumSignBits = LOI.NumSignBits;
|
|
unsigned NumZeroBits = LOI.KnownZero.countLeadingOnes();
|
|
|
|
// FIXME: We capture more information than the dag can represent. For
|
|
// now, just use the tightest assertzext/assertsext possible.
|
|
bool isSExt = true;
|
|
MVT FromVT(MVT::Other);
|
|
if (NumSignBits == RegSize)
|
|
isSExt = true, FromVT = MVT::i1; // ASSERT SEXT 1
|
|
else if (NumZeroBits >= RegSize-1)
|
|
isSExt = false, FromVT = MVT::i1; // ASSERT ZEXT 1
|
|
else if (NumSignBits > RegSize-8)
|
|
isSExt = true, FromVT = MVT::i8; // ASSERT SEXT 8
|
|
else if (NumZeroBits >= RegSize-9)
|
|
isSExt = false, FromVT = MVT::i8; // ASSERT ZEXT 8
|
|
else if (NumSignBits > RegSize-16)
|
|
isSExt = true, FromVT = MVT::i16; // ASSERT SEXT 16
|
|
else if (NumZeroBits >= RegSize-17)
|
|
isSExt = false, FromVT = MVT::i16; // ASSERT ZEXT 16
|
|
else if (NumSignBits > RegSize-32)
|
|
isSExt = true, FromVT = MVT::i32; // ASSERT SEXT 32
|
|
else if (NumZeroBits >= RegSize-33)
|
|
isSExt = false, FromVT = MVT::i32; // ASSERT ZEXT 32
|
|
|
|
if (FromVT != MVT::Other) {
|
|
P = DAG.getNode(isSExt ? ISD::AssertSext : ISD::AssertZext,
|
|
RegisterVT, P, DAG.getValueType(FromVT));
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
Parts[Part+i] = P;
|
|
}
|
|
|
|
Values[Value] = getCopyFromParts(DAG, &Parts[Part], NumRegs, RegisterVT,
|
|
ValueVT);
|
|
Part += NumRegs;
|
|
}
|
|
|
|
return DAG.getMergeValues(DAG.getVTList(&ValueVTs[0], ValueVTs.size()),
|
|
&Values[0], ValueVTs.size());
|
|
}
|
|
|
|
/// getCopyToRegs - Emit a series of CopyToReg nodes that copies the
|
|
/// specified value into the registers specified by this object. This uses
|
|
/// Chain/Flag as the input and updates them for the output Chain/Flag.
|
|
/// If the Flag pointer is NULL, no flag is used.
|
|
void RegsForValue::getCopyToRegs(SDOperand Val, SelectionDAG &DAG,
|
|
SDOperand &Chain, SDOperand *Flag) const {
|
|
// Get the list of the values's legal parts.
|
|
unsigned NumRegs = Regs.size();
|
|
SmallVector<SDOperand, 8> Parts(NumRegs);
|
|
for (unsigned Value = 0, Part = 0, e = ValueVTs.size(); Value != e; ++Value) {
|
|
MVT ValueVT = ValueVTs[Value];
|
|
unsigned NumParts = TLI->getNumRegisters(ValueVT);
|
|
MVT RegisterVT = RegVTs[Value];
|
|
|
|
getCopyToParts(DAG, Val.getValue(Val.ResNo + Value),
|
|
&Parts[Part], NumParts, RegisterVT);
|
|
Part += NumParts;
|
|
}
|
|
|
|
// Copy the parts into the registers.
|
|
SmallVector<SDOperand, 8> Chains(NumRegs);
|
|
for (unsigned i = 0; i != NumRegs; ++i) {
|
|
SDOperand Part;
|
|
if (Flag == 0)
|
|
Part = DAG.getCopyToReg(Chain, Regs[i], Parts[i]);
|
|
else {
|
|
Part = DAG.getCopyToReg(Chain, Regs[i], Parts[i], *Flag);
|
|
*Flag = Part.getValue(1);
|
|
}
|
|
Chains[i] = Part.getValue(0);
|
|
}
|
|
|
|
if (NumRegs == 1 || Flag)
|
|
// If NumRegs > 1 && Flag is used then the use of the last CopyToReg is
|
|
// flagged to it. That is the CopyToReg nodes and the user are considered
|
|
// a single scheduling unit. If we create a TokenFactor and return it as
|
|
// chain, then the TokenFactor is both a predecessor (operand) of the
|
|
// user as well as a successor (the TF operands are flagged to the user).
|
|
// c1, f1 = CopyToReg
|
|
// c2, f2 = CopyToReg
|
|
// c3 = TokenFactor c1, c2
|
|
// ...
|
|
// = op c3, ..., f2
|
|
Chain = Chains[NumRegs-1];
|
|
else
|
|
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &Chains[0], NumRegs);
|
|
}
|
|
|
|
/// AddInlineAsmOperands - Add this value to the specified inlineasm node
|
|
/// operand list. This adds the code marker and includes the number of
|
|
/// values added into it.
|
|
void RegsForValue::AddInlineAsmOperands(unsigned Code, SelectionDAG &DAG,
|
|
std::vector<SDOperand> &Ops) const {
|
|
MVT IntPtrTy = DAG.getTargetLoweringInfo().getPointerTy();
|
|
Ops.push_back(DAG.getTargetConstant(Code | (Regs.size() << 3), IntPtrTy));
|
|
for (unsigned Value = 0, Reg = 0, e = ValueVTs.size(); Value != e; ++Value) {
|
|
unsigned NumRegs = TLI->getNumRegisters(ValueVTs[Value]);
|
|
MVT RegisterVT = RegVTs[Value];
|
|
for (unsigned i = 0; i != NumRegs; ++i)
|
|
Ops.push_back(DAG.getRegister(Regs[Reg++], RegisterVT));
|
|
}
|
|
}
|
|
|
|
/// isAllocatableRegister - If the specified register is safe to allocate,
|
|
/// i.e. it isn't a stack pointer or some other special register, return the
|
|
/// register class for the register. Otherwise, return null.
|
|
static const TargetRegisterClass *
|
|
isAllocatableRegister(unsigned Reg, MachineFunction &MF,
|
|
const TargetLowering &TLI,
|
|
const TargetRegisterInfo *TRI) {
|
|
MVT FoundVT = MVT::Other;
|
|
const TargetRegisterClass *FoundRC = 0;
|
|
for (TargetRegisterInfo::regclass_iterator RCI = TRI->regclass_begin(),
|
|
E = TRI->regclass_end(); RCI != E; ++RCI) {
|
|
MVT ThisVT = MVT::Other;
|
|
|
|
const TargetRegisterClass *RC = *RCI;
|
|
// If none of the the value types for this register class are valid, we
|
|
// can't use it. For example, 64-bit reg classes on 32-bit targets.
|
|
for (TargetRegisterClass::vt_iterator I = RC->vt_begin(), E = RC->vt_end();
|
|
I != E; ++I) {
|
|
if (TLI.isTypeLegal(*I)) {
|
|
// If we have already found this register in a different register class,
|
|
// choose the one with the largest VT specified. For example, on
|
|
// PowerPC, we favor f64 register classes over f32.
|
|
if (FoundVT == MVT::Other || FoundVT.bitsLT(*I)) {
|
|
ThisVT = *I;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ThisVT == MVT::Other) continue;
|
|
|
|
// NOTE: This isn't ideal. In particular, this might allocate the
|
|
// frame pointer in functions that need it (due to them not being taken
|
|
// out of allocation, because a variable sized allocation hasn't been seen
|
|
// yet). This is a slight code pessimization, but should still work.
|
|
for (TargetRegisterClass::iterator I = RC->allocation_order_begin(MF),
|
|
E = RC->allocation_order_end(MF); I != E; ++I)
|
|
if (*I == Reg) {
|
|
// We found a matching register class. Keep looking at others in case
|
|
// we find one with larger registers that this physreg is also in.
|
|
FoundRC = RC;
|
|
FoundVT = ThisVT;
|
|
break;
|
|
}
|
|
}
|
|
return FoundRC;
|
|
}
|
|
|
|
|
|
namespace {
|
|
/// AsmOperandInfo - This contains information for each constraint that we are
|
|
/// lowering.
|
|
struct SDISelAsmOperandInfo : public TargetLowering::AsmOperandInfo {
|
|
/// CallOperand - If this is the result output operand or a clobber
|
|
/// this is null, otherwise it is the incoming operand to the CallInst.
|
|
/// This gets modified as the asm is processed.
|
|
SDOperand CallOperand;
|
|
|
|
/// AssignedRegs - If this is a register or register class operand, this
|
|
/// contains the set of register corresponding to the operand.
|
|
RegsForValue AssignedRegs;
|
|
|
|
explicit SDISelAsmOperandInfo(const InlineAsm::ConstraintInfo &info)
|
|
: TargetLowering::AsmOperandInfo(info), CallOperand(0,0) {
|
|
}
|
|
|
|
/// MarkAllocatedRegs - Once AssignedRegs is set, mark the assigned registers
|
|
/// busy in OutputRegs/InputRegs.
|
|
void MarkAllocatedRegs(bool isOutReg, bool isInReg,
|
|
std::set<unsigned> &OutputRegs,
|
|
std::set<unsigned> &InputRegs,
|
|
const TargetRegisterInfo &TRI) const {
|
|
if (isOutReg) {
|
|
for (unsigned i = 0, e = AssignedRegs.Regs.size(); i != e; ++i)
|
|
MarkRegAndAliases(AssignedRegs.Regs[i], OutputRegs, TRI);
|
|
}
|
|
if (isInReg) {
|
|
for (unsigned i = 0, e = AssignedRegs.Regs.size(); i != e; ++i)
|
|
MarkRegAndAliases(AssignedRegs.Regs[i], InputRegs, TRI);
|
|
}
|
|
}
|
|
|
|
private:
|
|
/// MarkRegAndAliases - Mark the specified register and all aliases in the
|
|
/// specified set.
|
|
static void MarkRegAndAliases(unsigned Reg, std::set<unsigned> &Regs,
|
|
const TargetRegisterInfo &TRI) {
|
|
assert(TargetRegisterInfo::isPhysicalRegister(Reg) && "Isn't a physreg");
|
|
Regs.insert(Reg);
|
|
if (const unsigned *Aliases = TRI.getAliasSet(Reg))
|
|
for (; *Aliases; ++Aliases)
|
|
Regs.insert(*Aliases);
|
|
}
|
|
};
|
|
} // end anon namespace.
|
|
|
|
|
|
/// GetRegistersForValue - Assign registers (virtual or physical) for the
|
|
/// specified operand. We prefer to assign virtual registers, to allow the
|
|
/// register allocator handle the assignment process. However, if the asm uses
|
|
/// features that we can't model on machineinstrs, we have SDISel do the
|
|
/// allocation. This produces generally horrible, but correct, code.
|
|
///
|
|
/// OpInfo describes the operand.
|
|
/// HasEarlyClobber is true if there are any early clobber constraints (=&r)
|
|
/// or any explicitly clobbered registers.
|
|
/// Input and OutputRegs are the set of already allocated physical registers.
|
|
///
|
|
void SelectionDAGLowering::
|
|
GetRegistersForValue(SDISelAsmOperandInfo &OpInfo, bool HasEarlyClobber,
|
|
std::set<unsigned> &OutputRegs,
|
|
std::set<unsigned> &InputRegs) {
|
|
// Compute whether this value requires an input register, an output register,
|
|
// or both.
|
|
bool isOutReg = false;
|
|
bool isInReg = false;
|
|
switch (OpInfo.Type) {
|
|
case InlineAsm::isOutput:
|
|
isOutReg = true;
|
|
|
|
// If this is an early-clobber output, or if there is an input
|
|
// constraint that matches this, we need to reserve the input register
|
|
// so no other inputs allocate to it.
|
|
isInReg = OpInfo.isEarlyClobber || OpInfo.hasMatchingInput;
|
|
break;
|
|
case InlineAsm::isInput:
|
|
isInReg = true;
|
|
isOutReg = false;
|
|
break;
|
|
case InlineAsm::isClobber:
|
|
isOutReg = true;
|
|
isInReg = true;
|
|
break;
|
|
}
|
|
|
|
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
SmallVector<unsigned, 4> Regs;
|
|
|
|
// If this is a constraint for a single physreg, or a constraint for a
|
|
// register class, find it.
|
|
std::pair<unsigned, const TargetRegisterClass*> PhysReg =
|
|
TLI.getRegForInlineAsmConstraint(OpInfo.ConstraintCode,
|
|
OpInfo.ConstraintVT);
|
|
|
|
unsigned NumRegs = 1;
|
|
if (OpInfo.ConstraintVT != MVT::Other)
|
|
NumRegs = TLI.getNumRegisters(OpInfo.ConstraintVT);
|
|
MVT RegVT;
|
|
MVT ValueVT = OpInfo.ConstraintVT;
|
|
|
|
|
|
// If this is a constraint for a specific physical register, like {r17},
|
|
// assign it now.
|
|
if (PhysReg.first) {
|
|
if (OpInfo.ConstraintVT == MVT::Other)
|
|
ValueVT = *PhysReg.second->vt_begin();
|
|
|
|
// Get the actual register value type. This is important, because the user
|
|
// may have asked for (e.g.) the AX register in i32 type. We need to
|
|
// remember that AX is actually i16 to get the right extension.
|
|
RegVT = *PhysReg.second->vt_begin();
|
|
|
|
// This is a explicit reference to a physical register.
|
|
Regs.push_back(PhysReg.first);
|
|
|
|
// If this is an expanded reference, add the rest of the regs to Regs.
|
|
if (NumRegs != 1) {
|
|
TargetRegisterClass::iterator I = PhysReg.second->begin();
|
|
for (; *I != PhysReg.first; ++I)
|
|
assert(I != PhysReg.second->end() && "Didn't find reg!");
|
|
|
|
// Already added the first reg.
|
|
--NumRegs; ++I;
|
|
for (; NumRegs; --NumRegs, ++I) {
|
|
assert(I != PhysReg.second->end() && "Ran out of registers to allocate!");
|
|
Regs.push_back(*I);
|
|
}
|
|
}
|
|
OpInfo.AssignedRegs = RegsForValue(TLI, Regs, RegVT, ValueVT);
|
|
const TargetRegisterInfo *TRI = DAG.getTarget().getRegisterInfo();
|
|
OpInfo.MarkAllocatedRegs(isOutReg, isInReg, OutputRegs, InputRegs, *TRI);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, if this was a reference to an LLVM register class, create vregs
|
|
// for this reference.
|
|
std::vector<unsigned> RegClassRegs;
|
|
const TargetRegisterClass *RC = PhysReg.second;
|
|
if (RC) {
|
|
// If this is an early clobber or tied register, our regalloc doesn't know
|
|
// how to maintain the constraint. If it isn't, go ahead and create vreg
|
|
// and let the regalloc do the right thing.
|
|
if (!OpInfo.hasMatchingInput && !OpInfo.isEarlyClobber &&
|
|
// If there is some other early clobber and this is an input register,
|
|
// then we are forced to pre-allocate the input reg so it doesn't
|
|
// conflict with the earlyclobber.
|
|
!(OpInfo.Type == InlineAsm::isInput && HasEarlyClobber)) {
|
|
RegVT = *PhysReg.second->vt_begin();
|
|
|
|
if (OpInfo.ConstraintVT == MVT::Other)
|
|
ValueVT = RegVT;
|
|
|
|
// Create the appropriate number of virtual registers.
|
|
MachineRegisterInfo &RegInfo = MF.getRegInfo();
|
|
for (; NumRegs; --NumRegs)
|
|
Regs.push_back(RegInfo.createVirtualRegister(PhysReg.second));
|
|
|
|
OpInfo.AssignedRegs = RegsForValue(TLI, Regs, RegVT, ValueVT);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, we can't allocate it. Let the code below figure out how to
|
|
// maintain these constraints.
|
|
RegClassRegs.assign(PhysReg.second->begin(), PhysReg.second->end());
|
|
|
|
} else {
|
|
// This is a reference to a register class that doesn't directly correspond
|
|
// to an LLVM register class. Allocate NumRegs consecutive, available,
|
|
// registers from the class.
|
|
RegClassRegs = TLI.getRegClassForInlineAsmConstraint(OpInfo.ConstraintCode,
|
|
OpInfo.ConstraintVT);
|
|
}
|
|
|
|
const TargetRegisterInfo *TRI = DAG.getTarget().getRegisterInfo();
|
|
unsigned NumAllocated = 0;
|
|
for (unsigned i = 0, e = RegClassRegs.size(); i != e; ++i) {
|
|
unsigned Reg = RegClassRegs[i];
|
|
// See if this register is available.
|
|
if ((isOutReg && OutputRegs.count(Reg)) || // Already used.
|
|
(isInReg && InputRegs.count(Reg))) { // Already used.
|
|
// Make sure we find consecutive registers.
|
|
NumAllocated = 0;
|
|
continue;
|
|
}
|
|
|
|
// Check to see if this register is allocatable (i.e. don't give out the
|
|
// stack pointer).
|
|
if (RC == 0) {
|
|
RC = isAllocatableRegister(Reg, MF, TLI, TRI);
|
|
if (!RC) { // Couldn't allocate this register.
|
|
// Reset NumAllocated to make sure we return consecutive registers.
|
|
NumAllocated = 0;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// Okay, this register is good, we can use it.
|
|
++NumAllocated;
|
|
|
|
// If we allocated enough consecutive registers, succeed.
|
|
if (NumAllocated == NumRegs) {
|
|
unsigned RegStart = (i-NumAllocated)+1;
|
|
unsigned RegEnd = i+1;
|
|
// Mark all of the allocated registers used.
|
|
for (unsigned i = RegStart; i != RegEnd; ++i)
|
|
Regs.push_back(RegClassRegs[i]);
|
|
|
|
OpInfo.AssignedRegs = RegsForValue(TLI, Regs, *RC->vt_begin(),
|
|
OpInfo.ConstraintVT);
|
|
OpInfo.MarkAllocatedRegs(isOutReg, isInReg, OutputRegs, InputRegs, *TRI);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Otherwise, we couldn't allocate enough registers for this.
|
|
}
|
|
|
|
|
|
/// visitInlineAsm - Handle a call to an InlineAsm object.
|
|
///
|
|
void SelectionDAGLowering::visitInlineAsm(CallSite CS) {
|
|
InlineAsm *IA = cast<InlineAsm>(CS.getCalledValue());
|
|
|
|
/// ConstraintOperands - Information about all of the constraints.
|
|
std::vector<SDISelAsmOperandInfo> ConstraintOperands;
|
|
|
|
SDOperand Chain = getRoot();
|
|
SDOperand Flag;
|
|
|
|
std::set<unsigned> OutputRegs, InputRegs;
|
|
|
|
// Do a prepass over the constraints, canonicalizing them, and building up the
|
|
// ConstraintOperands list.
|
|
std::vector<InlineAsm::ConstraintInfo>
|
|
ConstraintInfos = IA->ParseConstraints();
|
|
|
|
// SawEarlyClobber - Keep track of whether we saw an earlyclobber output
|
|
// constraint. If so, we can't let the register allocator allocate any input
|
|
// registers, because it will not know to avoid the earlyclobbered output reg.
|
|
bool SawEarlyClobber = false;
|
|
|
|
unsigned ArgNo = 0; // ArgNo - The argument of the CallInst.
|
|
unsigned ResNo = 0; // ResNo - The result number of the next output.
|
|
for (unsigned i = 0, e = ConstraintInfos.size(); i != e; ++i) {
|
|
ConstraintOperands.push_back(SDISelAsmOperandInfo(ConstraintInfos[i]));
|
|
SDISelAsmOperandInfo &OpInfo = ConstraintOperands.back();
|
|
|
|
MVT OpVT = MVT::Other;
|
|
|
|
// Compute the value type for each operand.
|
|
switch (OpInfo.Type) {
|
|
case InlineAsm::isOutput:
|
|
// Indirect outputs just consume an argument.
|
|
if (OpInfo.isIndirect) {
|
|
OpInfo.CallOperandVal = CS.getArgument(ArgNo++);
|
|
break;
|
|
}
|
|
// The return value of the call is this value. As such, there is no
|
|
// corresponding argument.
|
|
assert(CS.getType() != Type::VoidTy && "Bad inline asm!");
|
|
if (const StructType *STy = dyn_cast<StructType>(CS.getType())) {
|
|
OpVT = TLI.getValueType(STy->getElementType(ResNo));
|
|
} else {
|
|
assert(ResNo == 0 && "Asm only has one result!");
|
|
OpVT = TLI.getValueType(CS.getType());
|
|
}
|
|
++ResNo;
|
|
break;
|
|
case InlineAsm::isInput:
|
|
OpInfo.CallOperandVal = CS.getArgument(ArgNo++);
|
|
break;
|
|
case InlineAsm::isClobber:
|
|
// Nothing to do.
|
|
break;
|
|
}
|
|
|
|
// If this is an input or an indirect output, process the call argument.
|
|
// BasicBlocks are labels, currently appearing only in asm's.
|
|
if (OpInfo.CallOperandVal) {
|
|
if (BasicBlock *BB = dyn_cast<BasicBlock>(OpInfo.CallOperandVal))
|
|
OpInfo.CallOperand = DAG.getBasicBlock(FuncInfo.MBBMap[BB]);
|
|
else {
|
|
OpInfo.CallOperand = getValue(OpInfo.CallOperandVal);
|
|
const Type *OpTy = OpInfo.CallOperandVal->getType();
|
|
// If this is an indirect operand, the operand is a pointer to the
|
|
// accessed type.
|
|
if (OpInfo.isIndirect)
|
|
OpTy = cast<PointerType>(OpTy)->getElementType();
|
|
|
|
// If OpTy is not a single value, it may be a struct/union that we
|
|
// can tile with integers.
|
|
if (!OpTy->isSingleValueType() && OpTy->isSized()) {
|
|
unsigned BitSize = TD->getTypeSizeInBits(OpTy);
|
|
switch (BitSize) {
|
|
default: break;
|
|
case 1:
|
|
case 8:
|
|
case 16:
|
|
case 32:
|
|
case 64:
|
|
OpTy = IntegerType::get(BitSize);
|
|
break;
|
|
}
|
|
}
|
|
|
|
OpVT = TLI.getValueType(OpTy, true);
|
|
}
|
|
}
|
|
|
|
OpInfo.ConstraintVT = OpVT;
|
|
|
|
// Compute the constraint code and ConstraintType to use.
|
|
TLI.ComputeConstraintToUse(OpInfo, OpInfo.CallOperand, &DAG);
|
|
|
|
// Keep track of whether we see an earlyclobber.
|
|
SawEarlyClobber |= OpInfo.isEarlyClobber;
|
|
|
|
// If we see a clobber of a register, it is an early clobber.
|
|
if (!SawEarlyClobber &&
|
|
OpInfo.Type == InlineAsm::isClobber &&
|
|
OpInfo.ConstraintType == TargetLowering::C_Register) {
|
|
// Note that we want to ignore things that we don't trick here, like
|
|
// dirflag, fpsr, flags, etc.
|
|
std::pair<unsigned, const TargetRegisterClass*> PhysReg =
|
|
TLI.getRegForInlineAsmConstraint(OpInfo.ConstraintCode,
|
|
OpInfo.ConstraintVT);
|
|
if (PhysReg.first || PhysReg.second) {
|
|
// This is a register we know of.
|
|
SawEarlyClobber = true;
|
|
}
|
|
}
|
|
|
|
// If this is a memory input, and if the operand is not indirect, do what we
|
|
// need to to provide an address for the memory input.
|
|
if (OpInfo.ConstraintType == TargetLowering::C_Memory &&
|
|
!OpInfo.isIndirect) {
|
|
assert(OpInfo.Type == InlineAsm::isInput &&
|
|
"Can only indirectify direct input operands!");
|
|
|
|
// Memory operands really want the address of the value. If we don't have
|
|
// an indirect input, put it in the constpool if we can, otherwise spill
|
|
// it to a stack slot.
|
|
|
|
// If the operand is a float, integer, or vector constant, spill to a
|
|
// constant pool entry to get its address.
|
|
Value *OpVal = OpInfo.CallOperandVal;
|
|
if (isa<ConstantFP>(OpVal) || isa<ConstantInt>(OpVal) ||
|
|
isa<ConstantVector>(OpVal)) {
|
|
OpInfo.CallOperand = DAG.getConstantPool(cast<Constant>(OpVal),
|
|
TLI.getPointerTy());
|
|
} else {
|
|
// Otherwise, create a stack slot and emit a store to it before the
|
|
// asm.
|
|
const Type *Ty = OpVal->getType();
|
|
uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
|
|
unsigned Align = TLI.getTargetData()->getPrefTypeAlignment(Ty);
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
int SSFI = MF.getFrameInfo()->CreateStackObject(TySize, Align);
|
|
SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
|
|
Chain = DAG.getStore(Chain, OpInfo.CallOperand, StackSlot, NULL, 0);
|
|
OpInfo.CallOperand = StackSlot;
|
|
}
|
|
|
|
// There is no longer a Value* corresponding to this operand.
|
|
OpInfo.CallOperandVal = 0;
|
|
// It is now an indirect operand.
|
|
OpInfo.isIndirect = true;
|
|
}
|
|
|
|
// If this constraint is for a specific register, allocate it before
|
|
// anything else.
|
|
if (OpInfo.ConstraintType == TargetLowering::C_Register)
|
|
GetRegistersForValue(OpInfo, SawEarlyClobber, OutputRegs, InputRegs);
|
|
}
|
|
ConstraintInfos.clear();
|
|
|
|
|
|
// Second pass - Loop over all of the operands, assigning virtual or physregs
|
|
// to registerclass operands.
|
|
for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) {
|
|
SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i];
|
|
|
|
// C_Register operands have already been allocated, Other/Memory don't need
|
|
// to be.
|
|
if (OpInfo.ConstraintType == TargetLowering::C_RegisterClass)
|
|
GetRegistersForValue(OpInfo, SawEarlyClobber, OutputRegs, InputRegs);
|
|
}
|
|
|
|
// AsmNodeOperands - The operands for the ISD::INLINEASM node.
|
|
std::vector<SDOperand> AsmNodeOperands;
|
|
AsmNodeOperands.push_back(SDOperand()); // reserve space for input chain
|
|
AsmNodeOperands.push_back(
|
|
DAG.getTargetExternalSymbol(IA->getAsmString().c_str(), MVT::Other));
|
|
|
|
|
|
// Loop over all of the inputs, copying the operand values into the
|
|
// appropriate registers and processing the output regs.
|
|
RegsForValue RetValRegs;
|
|
|
|
// IndirectStoresToEmit - The set of stores to emit after the inline asm node.
|
|
std::vector<std::pair<RegsForValue, Value*> > IndirectStoresToEmit;
|
|
|
|
for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) {
|
|
SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i];
|
|
|
|
switch (OpInfo.Type) {
|
|
case InlineAsm::isOutput: {
|
|
if (OpInfo.ConstraintType != TargetLowering::C_RegisterClass &&
|
|
OpInfo.ConstraintType != TargetLowering::C_Register) {
|
|
// Memory output, or 'other' output (e.g. 'X' constraint).
|
|
assert(OpInfo.isIndirect && "Memory output must be indirect operand");
|
|
|
|
// Add information to the INLINEASM node to know about this output.
|
|
unsigned ResOpType = 4/*MEM*/ | (1 << 3);
|
|
AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType,
|
|
TLI.getPointerTy()));
|
|
AsmNodeOperands.push_back(OpInfo.CallOperand);
|
|
break;
|
|
}
|
|
|
|
// Otherwise, this is a register or register class output.
|
|
|
|
// Copy the output from the appropriate register. Find a register that
|
|
// we can use.
|
|
if (OpInfo.AssignedRegs.Regs.empty()) {
|
|
cerr << "Couldn't allocate output reg for constraint '"
|
|
<< OpInfo.ConstraintCode << "'!\n";
|
|
exit(1);
|
|
}
|
|
|
|
// If this is an indirect operand, store through the pointer after the
|
|
// asm.
|
|
if (OpInfo.isIndirect) {
|
|
IndirectStoresToEmit.push_back(std::make_pair(OpInfo.AssignedRegs,
|
|
OpInfo.CallOperandVal));
|
|
} else {
|
|
// This is the result value of the call.
|
|
assert(CS.getType() != Type::VoidTy && "Bad inline asm!");
|
|
// Concatenate this output onto the outputs list.
|
|
RetValRegs.append(OpInfo.AssignedRegs);
|
|
}
|
|
|
|
// Add information to the INLINEASM node to know that this register is
|
|
// set.
|
|
OpInfo.AssignedRegs.AddInlineAsmOperands(2 /*REGDEF*/, DAG,
|
|
AsmNodeOperands);
|
|
break;
|
|
}
|
|
case InlineAsm::isInput: {
|
|
SDOperand InOperandVal = OpInfo.CallOperand;
|
|
|
|
if (isdigit(OpInfo.ConstraintCode[0])) { // Matching constraint?
|
|
// If this is required to match an output register we have already set,
|
|
// just use its register.
|
|
unsigned OperandNo = atoi(OpInfo.ConstraintCode.c_str());
|
|
|
|
// Scan until we find the definition we already emitted of this operand.
|
|
// When we find it, create a RegsForValue operand.
|
|
unsigned CurOp = 2; // The first operand.
|
|
for (; OperandNo; --OperandNo) {
|
|
// Advance to the next operand.
|
|
unsigned NumOps =
|
|
cast<ConstantSDNode>(AsmNodeOperands[CurOp])->getValue();
|
|
assert(((NumOps & 7) == 2 /*REGDEF*/ ||
|
|
(NumOps & 7) == 4 /*MEM*/) &&
|
|
"Skipped past definitions?");
|
|
CurOp += (NumOps>>3)+1;
|
|
}
|
|
|
|
unsigned NumOps =
|
|
cast<ConstantSDNode>(AsmNodeOperands[CurOp])->getValue();
|
|
if ((NumOps & 7) == 2 /*REGDEF*/) {
|
|
// Add NumOps>>3 registers to MatchedRegs.
|
|
RegsForValue MatchedRegs;
|
|
MatchedRegs.TLI = &TLI;
|
|
MatchedRegs.ValueVTs.push_back(InOperandVal.getValueType());
|
|
MatchedRegs.RegVTs.push_back(AsmNodeOperands[CurOp+1].getValueType());
|
|
for (unsigned i = 0, e = NumOps>>3; i != e; ++i) {
|
|
unsigned Reg =
|
|
cast<RegisterSDNode>(AsmNodeOperands[++CurOp])->getReg();
|
|
MatchedRegs.Regs.push_back(Reg);
|
|
}
|
|
|
|
// Use the produced MatchedRegs object to
|
|
MatchedRegs.getCopyToRegs(InOperandVal, DAG, Chain, &Flag);
|
|
MatchedRegs.AddInlineAsmOperands(1 /*REGUSE*/, DAG, AsmNodeOperands);
|
|
break;
|
|
} else {
|
|
assert((NumOps & 7) == 4/*MEM*/ && "Unknown matching constraint!");
|
|
assert((NumOps >> 3) == 1 && "Unexpected number of operands");
|
|
// Add information to the INLINEASM node to know about this input.
|
|
unsigned ResOpType = 4/*MEM*/ | (1 << 3);
|
|
AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType,
|
|
TLI.getPointerTy()));
|
|
AsmNodeOperands.push_back(AsmNodeOperands[CurOp+1]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (OpInfo.ConstraintType == TargetLowering::C_Other) {
|
|
assert(!OpInfo.isIndirect &&
|
|
"Don't know how to handle indirect other inputs yet!");
|
|
|
|
std::vector<SDOperand> Ops;
|
|
TLI.LowerAsmOperandForConstraint(InOperandVal, OpInfo.ConstraintCode[0],
|
|
Ops, DAG);
|
|
if (Ops.empty()) {
|
|
cerr << "Invalid operand for inline asm constraint '"
|
|
<< OpInfo.ConstraintCode << "'!\n";
|
|
exit(1);
|
|
}
|
|
|
|
// Add information to the INLINEASM node to know about this input.
|
|
unsigned ResOpType = 3 /*IMM*/ | (Ops.size() << 3);
|
|
AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType,
|
|
TLI.getPointerTy()));
|
|
AsmNodeOperands.insert(AsmNodeOperands.end(), Ops.begin(), Ops.end());
|
|
break;
|
|
} else if (OpInfo.ConstraintType == TargetLowering::C_Memory) {
|
|
assert(OpInfo.isIndirect && "Operand must be indirect to be a mem!");
|
|
assert(InOperandVal.getValueType() == TLI.getPointerTy() &&
|
|
"Memory operands expect pointer values");
|
|
|
|
// Add information to the INLINEASM node to know about this input.
|
|
unsigned ResOpType = 4/*MEM*/ | (1 << 3);
|
|
AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType,
|
|
TLI.getPointerTy()));
|
|
AsmNodeOperands.push_back(InOperandVal);
|
|
break;
|
|
}
|
|
|
|
assert((OpInfo.ConstraintType == TargetLowering::C_RegisterClass ||
|
|
OpInfo.ConstraintType == TargetLowering::C_Register) &&
|
|
"Unknown constraint type!");
|
|
assert(!OpInfo.isIndirect &&
|
|
"Don't know how to handle indirect register inputs yet!");
|
|
|
|
// Copy the input into the appropriate registers.
|
|
assert(!OpInfo.AssignedRegs.Regs.empty() &&
|
|
"Couldn't allocate input reg!");
|
|
|
|
OpInfo.AssignedRegs.getCopyToRegs(InOperandVal, DAG, Chain, &Flag);
|
|
|
|
OpInfo.AssignedRegs.AddInlineAsmOperands(1/*REGUSE*/, DAG,
|
|
AsmNodeOperands);
|
|
break;
|
|
}
|
|
case InlineAsm::isClobber: {
|
|
// Add the clobbered value to the operand list, so that the register
|
|
// allocator is aware that the physreg got clobbered.
|
|
if (!OpInfo.AssignedRegs.Regs.empty())
|
|
OpInfo.AssignedRegs.AddInlineAsmOperands(2/*REGDEF*/, DAG,
|
|
AsmNodeOperands);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Finish up input operands.
|
|
AsmNodeOperands[0] = Chain;
|
|
if (Flag.Val) AsmNodeOperands.push_back(Flag);
|
|
|
|
Chain = DAG.getNode(ISD::INLINEASM,
|
|
DAG.getNodeValueTypes(MVT::Other, MVT::Flag), 2,
|
|
&AsmNodeOperands[0], AsmNodeOperands.size());
|
|
Flag = Chain.getValue(1);
|
|
|
|
// If this asm returns a register value, copy the result from that register
|
|
// and set it as the value of the call.
|
|
if (!RetValRegs.Regs.empty()) {
|
|
SDOperand Val = RetValRegs.getCopyFromRegs(DAG, Chain, &Flag);
|
|
|
|
// If any of the results of the inline asm is a vector, it may have the
|
|
// wrong width/num elts. This can happen for register classes that can
|
|
// contain multiple different value types. The preg or vreg allocated may
|
|
// not have the same VT as was expected. Convert it to the right type with
|
|
// bit_convert.
|
|
if (const StructType *ResSTy = dyn_cast<StructType>(CS.getType())) {
|
|
for (unsigned i = 0, e = ResSTy->getNumElements(); i != e; ++i) {
|
|
if (Val.Val->getValueType(i).isVector())
|
|
Val = DAG.getNode(ISD::BIT_CONVERT,
|
|
TLI.getValueType(ResSTy->getElementType(i)), Val);
|
|
}
|
|
} else {
|
|
if (Val.getValueType().isVector())
|
|
Val = DAG.getNode(ISD::BIT_CONVERT, TLI.getValueType(CS.getType()),
|
|
Val);
|
|
}
|
|
|
|
setValue(CS.getInstruction(), Val);
|
|
}
|
|
|
|
std::vector<std::pair<SDOperand, Value*> > StoresToEmit;
|
|
|
|
// Process indirect outputs, first output all of the flagged copies out of
|
|
// physregs.
|
|
for (unsigned i = 0, e = IndirectStoresToEmit.size(); i != e; ++i) {
|
|
RegsForValue &OutRegs = IndirectStoresToEmit[i].first;
|
|
Value *Ptr = IndirectStoresToEmit[i].second;
|
|
SDOperand OutVal = OutRegs.getCopyFromRegs(DAG, Chain, &Flag);
|
|
StoresToEmit.push_back(std::make_pair(OutVal, Ptr));
|
|
}
|
|
|
|
// Emit the non-flagged stores from the physregs.
|
|
SmallVector<SDOperand, 8> OutChains;
|
|
for (unsigned i = 0, e = StoresToEmit.size(); i != e; ++i)
|
|
OutChains.push_back(DAG.getStore(Chain, StoresToEmit[i].first,
|
|
getValue(StoresToEmit[i].second),
|
|
StoresToEmit[i].second, 0));
|
|
if (!OutChains.empty())
|
|
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
|
|
&OutChains[0], OutChains.size());
|
|
DAG.setRoot(Chain);
|
|
}
|
|
|
|
|
|
void SelectionDAGLowering::visitMalloc(MallocInst &I) {
|
|
SDOperand Src = getValue(I.getOperand(0));
|
|
|
|
MVT IntPtr = TLI.getPointerTy();
|
|
|
|
if (IntPtr.bitsLT(Src.getValueType()))
|
|
Src = DAG.getNode(ISD::TRUNCATE, IntPtr, Src);
|
|
else if (IntPtr.bitsGT(Src.getValueType()))
|
|
Src = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, Src);
|
|
|
|
// Scale the source by the type size.
|
|
uint64_t ElementSize = TD->getABITypeSize(I.getType()->getElementType());
|
|
Src = DAG.getNode(ISD::MUL, Src.getValueType(),
|
|
Src, DAG.getIntPtrConstant(ElementSize));
|
|
|
|
TargetLowering::ArgListTy Args;
|
|
TargetLowering::ArgListEntry Entry;
|
|
Entry.Node = Src;
|
|
Entry.Ty = TLI.getTargetData()->getIntPtrType();
|
|
Args.push_back(Entry);
|
|
|
|
std::pair<SDOperand,SDOperand> Result =
|
|
TLI.LowerCallTo(getRoot(), I.getType(), false, false, false, CallingConv::C,
|
|
true, DAG.getExternalSymbol("malloc", IntPtr), Args, DAG);
|
|
setValue(&I, Result.first); // Pointers always fit in registers
|
|
DAG.setRoot(Result.second);
|
|
}
|
|
|
|
void SelectionDAGLowering::visitFree(FreeInst &I) {
|
|
TargetLowering::ArgListTy Args;
|
|
TargetLowering::ArgListEntry Entry;
|
|
Entry.Node = getValue(I.getOperand(0));
|
|
Entry.Ty = TLI.getTargetData()->getIntPtrType();
|
|
Args.push_back(Entry);
|
|
MVT IntPtr = TLI.getPointerTy();
|
|
std::pair<SDOperand,SDOperand> Result =
|
|
TLI.LowerCallTo(getRoot(), Type::VoidTy, false, false, false,
|
|
CallingConv::C, true,
|
|
DAG.getExternalSymbol("free", IntPtr), Args, DAG);
|
|
DAG.setRoot(Result.second);
|
|
}
|
|
|
|
// EmitInstrWithCustomInserter - This method should be implemented by targets
|
|
// that mark instructions with the 'usesCustomDAGSchedInserter' flag. These
|
|
// instructions are special in various ways, which require special support to
|
|
// insert. The specified MachineInstr is created but not inserted into any
|
|
// basic blocks, and the scheduler passes ownership of it to this method.
|
|
MachineBasicBlock *TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
|
|
MachineBasicBlock *MBB) {
|
|
cerr << "If a target marks an instruction with "
|
|
<< "'usesCustomDAGSchedInserter', it must implement "
|
|
<< "TargetLowering::EmitInstrWithCustomInserter!\n";
|
|
abort();
|
|
return 0;
|
|
}
|
|
|
|
void SelectionDAGLowering::visitVAStart(CallInst &I) {
|
|
DAG.setRoot(DAG.getNode(ISD::VASTART, MVT::Other, getRoot(),
|
|
getValue(I.getOperand(1)),
|
|
DAG.getSrcValue(I.getOperand(1))));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitVAArg(VAArgInst &I) {
|
|
SDOperand V = DAG.getVAArg(TLI.getValueType(I.getType()), getRoot(),
|
|
getValue(I.getOperand(0)),
|
|
DAG.getSrcValue(I.getOperand(0)));
|
|
setValue(&I, V);
|
|
DAG.setRoot(V.getValue(1));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitVAEnd(CallInst &I) {
|
|
DAG.setRoot(DAG.getNode(ISD::VAEND, MVT::Other, getRoot(),
|
|
getValue(I.getOperand(1)),
|
|
DAG.getSrcValue(I.getOperand(1))));
|
|
}
|
|
|
|
void SelectionDAGLowering::visitVACopy(CallInst &I) {
|
|
DAG.setRoot(DAG.getNode(ISD::VACOPY, MVT::Other, getRoot(),
|
|
getValue(I.getOperand(1)),
|
|
getValue(I.getOperand(2)),
|
|
DAG.getSrcValue(I.getOperand(1)),
|
|
DAG.getSrcValue(I.getOperand(2))));
|
|
}
|
|
|
|
/// TargetLowering::LowerArguments - This is the default LowerArguments
|
|
/// implementation, which just inserts a FORMAL_ARGUMENTS node. FIXME: When all
|
|
/// targets are migrated to using FORMAL_ARGUMENTS, this hook should be
|
|
/// integrated into SDISel.
|
|
void TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDOperand> &ArgValues) {
|
|
// Add CC# and isVararg as operands to the FORMAL_ARGUMENTS node.
|
|
SmallVector<SDOperand, 3+16> Ops;
|
|
Ops.push_back(DAG.getRoot());
|
|
Ops.push_back(DAG.getConstant(F.getCallingConv(), getPointerTy()));
|
|
Ops.push_back(DAG.getConstant(F.isVarArg(), getPointerTy()));
|
|
|
|
// Add one result value for each formal argument.
|
|
SmallVector<MVT, 16> RetVals;
|
|
unsigned j = 1;
|
|
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
|
|
I != E; ++I, ++j) {
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
ComputeValueVTs(*this, I->getType(), ValueVTs);
|
|
for (unsigned Value = 0, NumValues = ValueVTs.size();
|
|
Value != NumValues; ++Value) {
|
|
MVT VT = ValueVTs[Value];
|
|
const Type *ArgTy = VT.getTypeForMVT();
|
|
ISD::ArgFlagsTy Flags;
|
|
unsigned OriginalAlignment =
|
|
getTargetData()->getABITypeAlignment(ArgTy);
|
|
|
|
if (F.paramHasAttr(j, ParamAttr::ZExt))
|
|
Flags.setZExt();
|
|
if (F.paramHasAttr(j, ParamAttr::SExt))
|
|
Flags.setSExt();
|
|
if (F.paramHasAttr(j, ParamAttr::InReg))
|
|
Flags.setInReg();
|
|
if (F.paramHasAttr(j, ParamAttr::StructRet))
|
|
Flags.setSRet();
|
|
if (F.paramHasAttr(j, ParamAttr::ByVal)) {
|
|
Flags.setByVal();
|
|
const PointerType *Ty = cast<PointerType>(I->getType());
|
|
const Type *ElementTy = Ty->getElementType();
|
|
unsigned FrameAlign = getByValTypeAlignment(ElementTy);
|
|
unsigned FrameSize = getTargetData()->getABITypeSize(ElementTy);
|
|
// For ByVal, alignment should be passed from FE. BE will guess if
|
|
// this info is not there but there are cases it cannot get right.
|
|
if (F.getParamAlignment(j))
|
|
FrameAlign = F.getParamAlignment(j);
|
|
Flags.setByValAlign(FrameAlign);
|
|
Flags.setByValSize(FrameSize);
|
|
}
|
|
if (F.paramHasAttr(j, ParamAttr::Nest))
|
|
Flags.setNest();
|
|
Flags.setOrigAlign(OriginalAlignment);
|
|
|
|
MVT RegisterVT = getRegisterType(VT);
|
|
unsigned NumRegs = getNumRegisters(VT);
|
|
for (unsigned i = 0; i != NumRegs; ++i) {
|
|
RetVals.push_back(RegisterVT);
|
|
ISD::ArgFlagsTy MyFlags = Flags;
|
|
if (NumRegs > 1 && i == 0)
|
|
MyFlags.setSplit();
|
|
// if it isn't first piece, alignment must be 1
|
|
else if (i > 0)
|
|
MyFlags.setOrigAlign(1);
|
|
Ops.push_back(DAG.getArgFlags(MyFlags));
|
|
}
|
|
}
|
|
}
|
|
|
|
RetVals.push_back(MVT::Other);
|
|
|
|
// Create the node.
|
|
SDNode *Result = DAG.getNode(ISD::FORMAL_ARGUMENTS,
|
|
DAG.getVTList(&RetVals[0], RetVals.size()),
|
|
&Ops[0], Ops.size()).Val;
|
|
|
|
// Prelower FORMAL_ARGUMENTS. This isn't required for functionality, but
|
|
// allows exposing the loads that may be part of the argument access to the
|
|
// first DAGCombiner pass.
|
|
SDOperand TmpRes = LowerOperation(SDOperand(Result, 0), DAG);
|
|
|
|
// The number of results should match up, except that the lowered one may have
|
|
// an extra flag result.
|
|
assert((Result->getNumValues() == TmpRes.Val->getNumValues() ||
|
|
(Result->getNumValues()+1 == TmpRes.Val->getNumValues() &&
|
|
TmpRes.getValue(Result->getNumValues()).getValueType() == MVT::Flag))
|
|
&& "Lowering produced unexpected number of results!");
|
|
Result = TmpRes.Val;
|
|
|
|
unsigned NumArgRegs = Result->getNumValues() - 1;
|
|
DAG.setRoot(SDOperand(Result, NumArgRegs));
|
|
|
|
// Set up the return result vector.
|
|
unsigned i = 0;
|
|
unsigned Idx = 1;
|
|
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E;
|
|
++I, ++Idx) {
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
ComputeValueVTs(*this, I->getType(), ValueVTs);
|
|
for (unsigned Value = 0, NumValues = ValueVTs.size();
|
|
Value != NumValues; ++Value) {
|
|
MVT VT = ValueVTs[Value];
|
|
MVT PartVT = getRegisterType(VT);
|
|
|
|
unsigned NumParts = getNumRegisters(VT);
|
|
SmallVector<SDOperand, 4> Parts(NumParts);
|
|
for (unsigned j = 0; j != NumParts; ++j)
|
|
Parts[j] = SDOperand(Result, i++);
|
|
|
|
ISD::NodeType AssertOp = ISD::DELETED_NODE;
|
|
if (F.paramHasAttr(Idx, ParamAttr::SExt))
|
|
AssertOp = ISD::AssertSext;
|
|
else if (F.paramHasAttr(Idx, ParamAttr::ZExt))
|
|
AssertOp = ISD::AssertZext;
|
|
|
|
ArgValues.push_back(getCopyFromParts(DAG, &Parts[0], NumParts, PartVT, VT,
|
|
AssertOp));
|
|
}
|
|
}
|
|
assert(i == NumArgRegs && "Argument register count mismatch!");
|
|
}
|
|
|
|
|
|
/// TargetLowering::LowerCallTo - This is the default LowerCallTo
|
|
/// implementation, which just inserts an ISD::CALL node, which is later custom
|
|
/// lowered by the target to something concrete. FIXME: When all targets are
|
|
/// migrated to using ISD::CALL, this hook should be integrated into SDISel.
|
|
std::pair<SDOperand, SDOperand>
|
|
TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
|
|
bool RetSExt, bool RetZExt, bool isVarArg,
|
|
unsigned CallingConv, bool isTailCall,
|
|
SDOperand Callee,
|
|
ArgListTy &Args, SelectionDAG &DAG) {
|
|
SmallVector<SDOperand, 32> Ops;
|
|
Ops.push_back(Chain); // Op#0 - Chain
|
|
Ops.push_back(DAG.getConstant(CallingConv, getPointerTy())); // Op#1 - CC
|
|
Ops.push_back(DAG.getConstant(isVarArg, getPointerTy())); // Op#2 - VarArg
|
|
Ops.push_back(DAG.getConstant(isTailCall, getPointerTy())); // Op#3 - Tail
|
|
Ops.push_back(Callee);
|
|
|
|
// Handle all of the outgoing arguments.
|
|
for (unsigned i = 0, e = Args.size(); i != e; ++i) {
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
ComputeValueVTs(*this, Args[i].Ty, ValueVTs);
|
|
for (unsigned Value = 0, NumValues = ValueVTs.size();
|
|
Value != NumValues; ++Value) {
|
|
MVT VT = ValueVTs[Value];
|
|
const Type *ArgTy = VT.getTypeForMVT();
|
|
SDOperand Op = SDOperand(Args[i].Node.Val, Args[i].Node.ResNo + Value);
|
|
ISD::ArgFlagsTy Flags;
|
|
unsigned OriginalAlignment =
|
|
getTargetData()->getABITypeAlignment(ArgTy);
|
|
|
|
if (Args[i].isZExt)
|
|
Flags.setZExt();
|
|
if (Args[i].isSExt)
|
|
Flags.setSExt();
|
|
if (Args[i].isInReg)
|
|
Flags.setInReg();
|
|
if (Args[i].isSRet)
|
|
Flags.setSRet();
|
|
if (Args[i].isByVal) {
|
|
Flags.setByVal();
|
|
const PointerType *Ty = cast<PointerType>(Args[i].Ty);
|
|
const Type *ElementTy = Ty->getElementType();
|
|
unsigned FrameAlign = getByValTypeAlignment(ElementTy);
|
|
unsigned FrameSize = getTargetData()->getABITypeSize(ElementTy);
|
|
// For ByVal, alignment should come from FE. BE will guess if this
|
|
// info is not there but there are cases it cannot get right.
|
|
if (Args[i].Alignment)
|
|
FrameAlign = Args[i].Alignment;
|
|
Flags.setByValAlign(FrameAlign);
|
|
Flags.setByValSize(FrameSize);
|
|
}
|
|
if (Args[i].isNest)
|
|
Flags.setNest();
|
|
Flags.setOrigAlign(OriginalAlignment);
|
|
|
|
MVT PartVT = getRegisterType(VT);
|
|
unsigned NumParts = getNumRegisters(VT);
|
|
SmallVector<SDOperand, 4> Parts(NumParts);
|
|
ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
|
|
|
|
if (Args[i].isSExt)
|
|
ExtendKind = ISD::SIGN_EXTEND;
|
|
else if (Args[i].isZExt)
|
|
ExtendKind = ISD::ZERO_EXTEND;
|
|
|
|
getCopyToParts(DAG, Op, &Parts[0], NumParts, PartVT, ExtendKind);
|
|
|
|
for (unsigned i = 0; i != NumParts; ++i) {
|
|
// if it isn't first piece, alignment must be 1
|
|
ISD::ArgFlagsTy MyFlags = Flags;
|
|
if (NumParts > 1 && i == 0)
|
|
MyFlags.setSplit();
|
|
else if (i != 0)
|
|
MyFlags.setOrigAlign(1);
|
|
|
|
Ops.push_back(Parts[i]);
|
|
Ops.push_back(DAG.getArgFlags(MyFlags));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Figure out the result value types. We start by making a list of
|
|
// the potentially illegal return value types.
|
|
SmallVector<MVT, 4> LoweredRetTys;
|
|
SmallVector<MVT, 4> RetTys;
|
|
ComputeValueVTs(*this, RetTy, RetTys);
|
|
|
|
// Then we translate that to a list of legal types.
|
|
for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
|
|
MVT VT = RetTys[I];
|
|
MVT RegisterVT = getRegisterType(VT);
|
|
unsigned NumRegs = getNumRegisters(VT);
|
|
for (unsigned i = 0; i != NumRegs; ++i)
|
|
LoweredRetTys.push_back(RegisterVT);
|
|
}
|
|
|
|
LoweredRetTys.push_back(MVT::Other); // Always has a chain.
|
|
|
|
// Create the CALL node.
|
|
SDOperand Res = DAG.getNode(ISD::CALL,
|
|
DAG.getVTList(&LoweredRetTys[0],
|
|
LoweredRetTys.size()),
|
|
&Ops[0], Ops.size());
|
|
Chain = Res.getValue(LoweredRetTys.size() - 1);
|
|
|
|
// Gather up the call result into a single value.
|
|
if (RetTy != Type::VoidTy) {
|
|
ISD::NodeType AssertOp = ISD::DELETED_NODE;
|
|
|
|
if (RetSExt)
|
|
AssertOp = ISD::AssertSext;
|
|
else if (RetZExt)
|
|
AssertOp = ISD::AssertZext;
|
|
|
|
SmallVector<SDOperand, 4> ReturnValues;
|
|
unsigned RegNo = 0;
|
|
for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
|
|
MVT VT = RetTys[I];
|
|
MVT RegisterVT = getRegisterType(VT);
|
|
unsigned NumRegs = getNumRegisters(VT);
|
|
unsigned RegNoEnd = NumRegs + RegNo;
|
|
SmallVector<SDOperand, 4> Results;
|
|
for (; RegNo != RegNoEnd; ++RegNo)
|
|
Results.push_back(Res.getValue(RegNo));
|
|
SDOperand ReturnValue =
|
|
getCopyFromParts(DAG, &Results[0], NumRegs, RegisterVT, VT,
|
|
AssertOp);
|
|
ReturnValues.push_back(ReturnValue);
|
|
}
|
|
Res = DAG.getMergeValues(DAG.getVTList(&RetTys[0], RetTys.size()),
|
|
&ReturnValues[0], ReturnValues.size());
|
|
}
|
|
|
|
return std::make_pair(Res, Chain);
|
|
}
|
|
|
|
SDOperand TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
|
|
assert(0 && "LowerOperation not implemented for this target!");
|
|
abort();
|
|
return SDOperand();
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// SelectionDAGISel code
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
unsigned SelectionDAGISel::MakeReg(MVT VT) {
|
|
return RegInfo->createVirtualRegister(TLI.getRegClassFor(VT));
|
|
}
|
|
|
|
void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.addRequired<AliasAnalysis>();
|
|
AU.addRequired<CollectorModuleMetadata>();
|
|
AU.setPreservesAll();
|
|
}
|
|
|
|
bool SelectionDAGISel::runOnFunction(Function &Fn) {
|
|
// Get alias analysis for load/store combining.
|
|
AA = &getAnalysis<AliasAnalysis>();
|
|
|
|
MachineFunction &MF = MachineFunction::construct(&Fn, TLI.getTargetMachine());
|
|
if (MF.getFunction()->hasCollector())
|
|
GCI = &getAnalysis<CollectorModuleMetadata>().get(*MF.getFunction());
|
|
else
|
|
GCI = 0;
|
|
RegInfo = &MF.getRegInfo();
|
|
DOUT << "\n\n\n=== " << Fn.getName() << "\n";
|
|
|
|
FunctionLoweringInfo FuncInfo(TLI, Fn, MF);
|
|
|
|
for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
|
|
if (InvokeInst *Invoke = dyn_cast<InvokeInst>(I->getTerminator()))
|
|
// Mark landing pad.
|
|
FuncInfo.MBBMap[Invoke->getSuccessor(1)]->setIsLandingPad();
|
|
|
|
SelectAllBasicBlocks(Fn, MF, FuncInfo);
|
|
|
|
// Add function live-ins to entry block live-in set.
|
|
BasicBlock *EntryBB = &Fn.getEntryBlock();
|
|
BB = FuncInfo.MBBMap[EntryBB];
|
|
if (!RegInfo->livein_empty())
|
|
for (MachineRegisterInfo::livein_iterator I = RegInfo->livein_begin(),
|
|
E = RegInfo->livein_end(); I != E; ++I)
|
|
BB->addLiveIn(I->first);
|
|
|
|
#ifndef NDEBUG
|
|
assert(FuncInfo.CatchInfoFound.size() == FuncInfo.CatchInfoLost.size() &&
|
|
"Not all catch info was assigned to a landing pad!");
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
void SelectionDAGLowering::CopyValueToVirtualRegister(Value *V, unsigned Reg) {
|
|
SDOperand Op = getValue(V);
|
|
assert((Op.getOpcode() != ISD::CopyFromReg ||
|
|
cast<RegisterSDNode>(Op.getOperand(1))->getReg() != Reg) &&
|
|
"Copy from a reg to the same reg!");
|
|
assert(!TargetRegisterInfo::isPhysicalRegister(Reg) && "Is a physreg");
|
|
|
|
RegsForValue RFV(TLI, Reg, V->getType());
|
|
SDOperand Chain = DAG.getEntryNode();
|
|
RFV.getCopyToRegs(Op, DAG, Chain, 0);
|
|
PendingExports.push_back(Chain);
|
|
}
|
|
|
|
void SelectionDAGISel::
|
|
LowerArguments(BasicBlock *LLVMBB, SelectionDAGLowering &SDL) {
|
|
// If this is the entry block, emit arguments.
|
|
Function &F = *LLVMBB->getParent();
|
|
FunctionLoweringInfo &FuncInfo = SDL.FuncInfo;
|
|
SDOperand OldRoot = SDL.DAG.getRoot();
|
|
SmallVector<SDOperand, 16> Args;
|
|
TLI.LowerArguments(F, SDL.DAG, Args);
|
|
|
|
unsigned a = 0;
|
|
for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end();
|
|
AI != E; ++AI) {
|
|
SmallVector<MVT, 4> ValueVTs;
|
|
ComputeValueVTs(TLI, AI->getType(), ValueVTs);
|
|
unsigned NumValues = ValueVTs.size();
|
|
if (!AI->use_empty()) {
|
|
SDL.setValue(AI, SDL.DAG.getMergeValues(&Args[a], NumValues));
|
|
// If this argument is live outside of the entry block, insert a copy from
|
|
// whereever we got it to the vreg that other BB's will reference it as.
|
|
DenseMap<const Value*, unsigned>::iterator VMI=FuncInfo.ValueMap.find(AI);
|
|
if (VMI != FuncInfo.ValueMap.end()) {
|
|
SDL.CopyValueToVirtualRegister(AI, VMI->second);
|
|
}
|
|
}
|
|
a += NumValues;
|
|
}
|
|
|
|
// Finally, if the target has anything special to do, allow it to do so.
|
|
// FIXME: this should insert code into the DAG!
|
|
EmitFunctionEntryCode(F, SDL.DAG.getMachineFunction());
|
|
}
|
|
|
|
static void copyCatchInfo(BasicBlock *SrcBB, BasicBlock *DestBB,
|
|
MachineModuleInfo *MMI, FunctionLoweringInfo &FLI) {
|
|
for (BasicBlock::iterator I = SrcBB->begin(), E = --SrcBB->end(); I != E; ++I)
|
|
if (isSelector(I)) {
|
|
// Apply the catch info to DestBB.
|
|
addCatchInfo(cast<CallInst>(*I), MMI, FLI.MBBMap[DestBB]);
|
|
#ifndef NDEBUG
|
|
if (!FLI.MBBMap[SrcBB]->isLandingPad())
|
|
FLI.CatchInfoFound.insert(I);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/// IsFixedFrameObjectWithPosOffset - Check if object is a fixed frame object and
|
|
/// whether object offset >= 0.
|
|
static bool
|
|
IsFixedFrameObjectWithPosOffset(MachineFrameInfo * MFI, SDOperand Op) {
|
|
if (!isa<FrameIndexSDNode>(Op)) return false;
|
|
|
|
FrameIndexSDNode * FrameIdxNode = dyn_cast<FrameIndexSDNode>(Op);
|
|
int FrameIdx = FrameIdxNode->getIndex();
|
|
return MFI->isFixedObjectIndex(FrameIdx) &&
|
|
MFI->getObjectOffset(FrameIdx) >= 0;
|
|
}
|
|
|
|
/// IsPossiblyOverwrittenArgumentOfTailCall - Check if the operand could
|
|
/// possibly be overwritten when lowering the outgoing arguments in a tail
|
|
/// call. Currently the implementation of this call is very conservative and
|
|
/// assumes all arguments sourcing from FORMAL_ARGUMENTS or a CopyFromReg with
|
|
/// virtual registers would be overwritten by direct lowering.
|
|
static bool IsPossiblyOverwrittenArgumentOfTailCall(SDOperand Op,
|
|
MachineFrameInfo * MFI) {
|
|
RegisterSDNode * OpReg = NULL;
|
|
if (Op.getOpcode() == ISD::FORMAL_ARGUMENTS ||
|
|
(Op.getOpcode()== ISD::CopyFromReg &&
|
|
(OpReg = dyn_cast<RegisterSDNode>(Op.getOperand(1))) &&
|
|
(OpReg->getReg() >= TargetRegisterInfo::FirstVirtualRegister)) ||
|
|
(Op.getOpcode() == ISD::LOAD &&
|
|
IsFixedFrameObjectWithPosOffset(MFI, Op.getOperand(1))) ||
|
|
(Op.getOpcode() == ISD::MERGE_VALUES &&
|
|
Op.getOperand(Op.ResNo).getOpcode() == ISD::LOAD &&
|
|
IsFixedFrameObjectWithPosOffset(MFI, Op.getOperand(Op.ResNo).
|
|
getOperand(1))))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// CheckDAGForTailCallsAndFixThem - This Function looks for CALL nodes in the
|
|
/// DAG and fixes their tailcall attribute operand.
|
|
static void CheckDAGForTailCallsAndFixThem(SelectionDAG &DAG,
|
|
TargetLowering& TLI) {
|
|
SDNode * Ret = NULL;
|
|
SDOperand Terminator = DAG.getRoot();
|
|
|
|
// Find RET node.
|
|
if (Terminator.getOpcode() == ISD::RET) {
|
|
Ret = Terminator.Val;
|
|
}
|
|
|
|
// Fix tail call attribute of CALL nodes.
|
|
for (SelectionDAG::allnodes_iterator BE = DAG.allnodes_begin(),
|
|
BI = DAG.allnodes_end(); BI != BE; ) {
|
|
--BI;
|
|
if (BI->getOpcode() == ISD::CALL) {
|
|
SDOperand OpRet(Ret, 0);
|
|
SDOperand OpCall(BI, 0);
|
|
bool isMarkedTailCall =
|
|
cast<ConstantSDNode>(OpCall.getOperand(3))->getValue() != 0;
|
|
// If CALL node has tail call attribute set to true and the call is not
|
|
// eligible (no RET or the target rejects) the attribute is fixed to
|
|
// false. The TargetLowering::IsEligibleForTailCallOptimization function
|
|
// must correctly identify tail call optimizable calls.
|
|
if (!isMarkedTailCall) continue;
|
|
if (Ret==NULL ||
|
|
!TLI.IsEligibleForTailCallOptimization(OpCall, OpRet, DAG)) {
|
|
// Not eligible. Mark CALL node as non tail call.
|
|
SmallVector<SDOperand, 32> Ops;
|
|
unsigned idx=0;
|
|
for(SDNode::op_iterator I =OpCall.Val->op_begin(),
|
|
E = OpCall.Val->op_end(); I != E; I++, idx++) {
|
|
if (idx!=3)
|
|
Ops.push_back(*I);
|
|
else
|
|
Ops.push_back(DAG.getConstant(false, TLI.getPointerTy()));
|
|
}
|
|
DAG.UpdateNodeOperands(OpCall, Ops.begin(), Ops.size());
|
|
} else {
|
|
// Look for tail call clobbered arguments. Emit a series of
|
|
// copyto/copyfrom virtual register nodes to protect them.
|
|
SmallVector<SDOperand, 32> Ops;
|
|
SDOperand Chain = OpCall.getOperand(0), InFlag;
|
|
unsigned idx=0;
|
|
for(SDNode::op_iterator I = OpCall.Val->op_begin(),
|
|
E = OpCall.Val->op_end(); I != E; I++, idx++) {
|
|
SDOperand Arg = *I;
|
|
if (idx > 4 && (idx % 2)) {
|
|
bool isByVal = cast<ARG_FLAGSSDNode>(OpCall.getOperand(idx+1))->
|
|
getArgFlags().isByVal();
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
MachineFrameInfo *MFI = MF.getFrameInfo();
|
|
if (!isByVal &&
|
|
IsPossiblyOverwrittenArgumentOfTailCall(Arg, MFI)) {
|
|
MVT VT = Arg.getValueType();
|
|
unsigned VReg = MF.getRegInfo().
|
|
createVirtualRegister(TLI.getRegClassFor(VT));
|
|
Chain = DAG.getCopyToReg(Chain, VReg, Arg, InFlag);
|
|
InFlag = Chain.getValue(1);
|
|
Arg = DAG.getCopyFromReg(Chain, VReg, VT, InFlag);
|
|
Chain = Arg.getValue(1);
|
|
InFlag = Arg.getValue(2);
|
|
}
|
|
}
|
|
Ops.push_back(Arg);
|
|
}
|
|
// Link in chain of CopyTo/CopyFromReg.
|
|
Ops[0] = Chain;
|
|
DAG.UpdateNodeOperands(OpCall, Ops.begin(), Ops.size());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
|
|
std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate,
|
|
FunctionLoweringInfo &FuncInfo) {
|
|
SelectionDAGLowering SDL(DAG, TLI, *AA, FuncInfo, GCI);
|
|
|
|
// Lower any arguments needed in this block if this is the entry block.
|
|
if (LLVMBB == &LLVMBB->getParent()->getEntryBlock())
|
|
LowerArguments(LLVMBB, SDL);
|
|
|
|
BB = FuncInfo.MBBMap[LLVMBB];
|
|
SDL.setCurrentBasicBlock(BB);
|
|
|
|
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
|
|
|
|
if (MMI && BB->isLandingPad()) {
|
|
// Add a label to mark the beginning of the landing pad. Deletion of the
|
|
// landing pad can thus be detected via the MachineModuleInfo.
|
|
unsigned LabelID = MMI->addLandingPad(BB);
|
|
DAG.setRoot(DAG.getLabel(ISD::EH_LABEL, DAG.getEntryNode(), LabelID));
|
|
|
|
// Mark exception register as live in.
|
|
unsigned Reg = TLI.getExceptionAddressRegister();
|
|
if (Reg) BB->addLiveIn(Reg);
|
|
|
|
// Mark exception selector register as live in.
|
|
Reg = TLI.getExceptionSelectorRegister();
|
|
if (Reg) BB->addLiveIn(Reg);
|
|
|
|
// FIXME: Hack around an exception handling flaw (PR1508): the personality
|
|
// function and list of typeids logically belong to the invoke (or, if you
|
|
// like, the basic block containing the invoke), and need to be associated
|
|
// with it in the dwarf exception handling tables. Currently however the
|
|
// information is provided by an intrinsic (eh.selector) that can be moved
|
|
// to unexpected places by the optimizers: if the unwind edge is critical,
|
|
// then breaking it can result in the intrinsics being in the successor of
|
|
// the landing pad, not the landing pad itself. This results in exceptions
|
|
// not being caught because no typeids are associated with the invoke.
|
|
// This may not be the only way things can go wrong, but it is the only way
|
|
// we try to work around for the moment.
|
|
BranchInst *Br = dyn_cast<BranchInst>(LLVMBB->getTerminator());
|
|
|
|
if (Br && Br->isUnconditional()) { // Critical edge?
|
|
BasicBlock::iterator I, E;
|
|
for (I = LLVMBB->begin(), E = --LLVMBB->end(); I != E; ++I)
|
|
if (isSelector(I))
|
|
break;
|
|
|
|
if (I == E)
|
|
// No catch info found - try to extract some from the successor.
|
|
copyCatchInfo(Br->getSuccessor(0), LLVMBB, MMI, FuncInfo);
|
|
}
|
|
}
|
|
|
|
// Lower all of the non-terminator instructions.
|
|
for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end();
|
|
I != E; ++I)
|
|
SDL.visit(*I);
|
|
|
|
// Ensure that all instructions which are used outside of their defining
|
|
// blocks are available as virtual registers. Invoke is handled elsewhere.
|
|
for (BasicBlock::iterator I = LLVMBB->begin(), E = LLVMBB->end(); I != E;++I)
|
|
if (!I->use_empty() && !isa<PHINode>(I) && !isa<InvokeInst>(I)) {
|
|
DenseMap<const Value*, unsigned>::iterator VMI =FuncInfo.ValueMap.find(I);
|
|
if (VMI != FuncInfo.ValueMap.end())
|
|
SDL.CopyValueToVirtualRegister(I, VMI->second);
|
|
}
|
|
|
|
// Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to
|
|
// ensure constants are generated when needed. Remember the virtual registers
|
|
// that need to be added to the Machine PHI nodes as input. We cannot just
|
|
// directly add them, because expansion might result in multiple MBB's for one
|
|
// BB. As such, the start of the BB might correspond to a different MBB than
|
|
// the end.
|
|
//
|
|
TerminatorInst *TI = LLVMBB->getTerminator();
|
|
|
|
// Emit constants only once even if used by multiple PHI nodes.
|
|
std::map<Constant*, unsigned> ConstantsOut;
|
|
|
|
// Vector bool would be better, but vector<bool> is really slow.
|
|
std::vector<unsigned char> SuccsHandled;
|
|
if (TI->getNumSuccessors())
|
|
SuccsHandled.resize(BB->getParent()->getNumBlockIDs());
|
|
|
|
// Check successor nodes' PHI nodes that expect a constant to be available
|
|
// from this block.
|
|
for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) {
|
|
BasicBlock *SuccBB = TI->getSuccessor(succ);
|
|
if (!isa<PHINode>(SuccBB->begin())) continue;
|
|
MachineBasicBlock *SuccMBB = FuncInfo.MBBMap[SuccBB];
|
|
|
|
// If this terminator has multiple identical successors (common for
|
|
// switches), only handle each succ once.
|
|
unsigned SuccMBBNo = SuccMBB->getNumber();
|
|
if (SuccsHandled[SuccMBBNo]) continue;
|
|
SuccsHandled[SuccMBBNo] = true;
|
|
|
|
MachineBasicBlock::iterator MBBI = SuccMBB->begin();
|
|
PHINode *PN;
|
|
|
|
// At this point we know that there is a 1-1 correspondence between LLVM PHI
|
|
// nodes and Machine PHI nodes, but the incoming operands have not been
|
|
// emitted yet.
|
|
for (BasicBlock::iterator I = SuccBB->begin();
|
|
(PN = dyn_cast<PHINode>(I)); ++I) {
|
|
// Ignore dead phi's.
|
|
if (PN->use_empty()) continue;
|
|
|
|
unsigned Reg;
|
|
Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB);
|
|
|
|
if (Constant *C = dyn_cast<Constant>(PHIOp)) {
|
|
unsigned &RegOut = ConstantsOut[C];
|
|
if (RegOut == 0) {
|
|
RegOut = FuncInfo.CreateRegForValue(C);
|
|
SDL.CopyValueToVirtualRegister(C, RegOut);
|
|
}
|
|
Reg = RegOut;
|
|
} else {
|
|
Reg = FuncInfo.ValueMap[PHIOp];
|
|
if (Reg == 0) {
|
|
assert(isa<AllocaInst>(PHIOp) &&
|
|
FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) &&
|
|
"Didn't codegen value into a register!??");
|
|
Reg = FuncInfo.CreateRegForValue(PHIOp);
|
|
SDL.CopyValueToVirtualRegister(PHIOp, Reg);
|
|
}
|
|
}
|
|
|
|
// Remember that this register needs to added to the machine PHI node as
|
|
// the input for this MBB.
|
|
MVT VT = TLI.getValueType(PN->getType());
|
|
unsigned NumRegisters = TLI.getNumRegisters(VT);
|
|
for (unsigned i = 0, e = NumRegisters; i != e; ++i)
|
|
PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i));
|
|
}
|
|
}
|
|
ConstantsOut.clear();
|
|
|
|
// Lower the terminator after the copies are emitted.
|
|
SDL.visit(*LLVMBB->getTerminator());
|
|
|
|
// Copy over any CaseBlock records that may now exist due to SwitchInst
|
|
// lowering, as well as any jump table information.
|
|
SwitchCases.clear();
|
|
SwitchCases = SDL.SwitchCases;
|
|
JTCases.clear();
|
|
JTCases = SDL.JTCases;
|
|
BitTestCases.clear();
|
|
BitTestCases = SDL.BitTestCases;
|
|
|
|
// Make sure the root of the DAG is up-to-date.
|
|
DAG.setRoot(SDL.getControlRoot());
|
|
|
|
// Check whether calls in this block are real tail calls. Fix up CALL nodes
|
|
// with correct tailcall attribute so that the target can rely on the tailcall
|
|
// attribute indicating whether the call is really eligible for tail call
|
|
// optimization.
|
|
CheckDAGForTailCallsAndFixThem(DAG, TLI);
|
|
}
|
|
|
|
void SelectionDAGISel::ComputeLiveOutVRegInfo(SelectionDAG &DAG) {
|
|
SmallPtrSet<SDNode*, 128> VisitedNodes;
|
|
SmallVector<SDNode*, 128> Worklist;
|
|
|
|
Worklist.push_back(DAG.getRoot().Val);
|
|
|
|
APInt Mask;
|
|
APInt KnownZero;
|
|
APInt KnownOne;
|
|
|
|
while (!Worklist.empty()) {
|
|
SDNode *N = Worklist.back();
|
|
Worklist.pop_back();
|
|
|
|
// If we've already seen this node, ignore it.
|
|
if (!VisitedNodes.insert(N))
|
|
continue;
|
|
|
|
// Otherwise, add all chain operands to the worklist.
|
|
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
|
|
if (N->getOperand(i).getValueType() == MVT::Other)
|
|
Worklist.push_back(N->getOperand(i).Val);
|
|
|
|
// If this is a CopyToReg with a vreg dest, process it.
|
|
if (N->getOpcode() != ISD::CopyToReg)
|
|
continue;
|
|
|
|
unsigned DestReg = cast<RegisterSDNode>(N->getOperand(1))->getReg();
|
|
if (!TargetRegisterInfo::isVirtualRegister(DestReg))
|
|
continue;
|
|
|
|
// Ignore non-scalar or non-integer values.
|
|
SDOperand Src = N->getOperand(2);
|
|
MVT SrcVT = Src.getValueType();
|
|
if (!SrcVT.isInteger() || SrcVT.isVector())
|
|
continue;
|
|
|
|
unsigned NumSignBits = DAG.ComputeNumSignBits(Src);
|
|
Mask = APInt::getAllOnesValue(SrcVT.getSizeInBits());
|
|
DAG.ComputeMaskedBits(Src, Mask, KnownZero, KnownOne);
|
|
|
|
// Only install this information if it tells us something.
|
|
if (NumSignBits != 1 || KnownZero != 0 || KnownOne != 0) {
|
|
DestReg -= TargetRegisterInfo::FirstVirtualRegister;
|
|
FunctionLoweringInfo &FLI = DAG.getFunctionLoweringInfo();
|
|
if (DestReg >= FLI.LiveOutRegInfo.size())
|
|
FLI.LiveOutRegInfo.resize(DestReg+1);
|
|
FunctionLoweringInfo::LiveOutInfo &LOI = FLI.LiveOutRegInfo[DestReg];
|
|
LOI.NumSignBits = NumSignBits;
|
|
LOI.KnownOne = NumSignBits;
|
|
LOI.KnownZero = NumSignBits;
|
|
}
|
|
}
|
|
}
|
|
|
|
void SelectionDAGISel::CodeGenAndEmitDAG(SelectionDAG &DAG) {
|
|
DOUT << "Lowered selection DAG:\n";
|
|
DEBUG(DAG.dump());
|
|
std::string GroupName = "Instruction Selection and Scheduling";
|
|
|
|
// Run the DAG combiner in pre-legalize mode.
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("DAG Combining 1", GroupName);
|
|
DAG.Combine(false, *AA);
|
|
} else {
|
|
DAG.Combine(false, *AA);
|
|
}
|
|
|
|
DOUT << "Optimized lowered selection DAG:\n";
|
|
DEBUG(DAG.dump());
|
|
|
|
// Second step, hack on the DAG until it only uses operations and types that
|
|
// the target supports.
|
|
if (EnableLegalizeTypes) {// Enable this some day.
|
|
DAG.LegalizeTypes();
|
|
// TODO: enable a dag combine pass here.
|
|
}
|
|
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("DAG Legalization", GroupName);
|
|
DAG.Legalize();
|
|
} else {
|
|
DAG.Legalize();
|
|
}
|
|
|
|
DOUT << "Legalized selection DAG:\n";
|
|
DEBUG(DAG.dump());
|
|
|
|
// Run the DAG combiner in post-legalize mode.
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("DAG Combining 2", GroupName);
|
|
DAG.Combine(true, *AA);
|
|
} else {
|
|
DAG.Combine(true, *AA);
|
|
}
|
|
|
|
DOUT << "Optimized legalized selection DAG:\n";
|
|
DEBUG(DAG.dump());
|
|
|
|
if (ViewISelDAGs) DAG.viewGraph();
|
|
|
|
if (!FastISel && EnableValueProp)
|
|
ComputeLiveOutVRegInfo(DAG);
|
|
|
|
// Third, instruction select all of the operations to machine code, adding the
|
|
// code to the MachineBasicBlock.
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("Instruction Selection", GroupName);
|
|
InstructionSelect(DAG);
|
|
} else {
|
|
InstructionSelect(DAG);
|
|
}
|
|
|
|
// Schedule machine code.
|
|
ScheduleDAG *Scheduler;
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("Instruction Scheduling", GroupName);
|
|
Scheduler = Schedule(DAG);
|
|
} else {
|
|
Scheduler = Schedule(DAG);
|
|
}
|
|
|
|
// Emit machine code to BB. This can change 'BB' to the last block being
|
|
// inserted into.
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("Instruction Creation", GroupName);
|
|
BB = Scheduler->EmitSchedule();
|
|
} else {
|
|
BB = Scheduler->EmitSchedule();
|
|
}
|
|
|
|
// Free the scheduler state.
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("Instruction Scheduling Cleanup", GroupName);
|
|
delete Scheduler;
|
|
} else {
|
|
delete Scheduler;
|
|
}
|
|
|
|
// Perform target specific isel post processing.
|
|
if (TimePassesIsEnabled) {
|
|
NamedRegionTimer T("Instruction Selection Post Processing", GroupName);
|
|
InstructionSelectPostProcessing(DAG);
|
|
} else {
|
|
InstructionSelectPostProcessing(DAG);
|
|
}
|
|
|
|
DOUT << "Selected machine code:\n";
|
|
DEBUG(BB->dump());
|
|
}
|
|
|
|
void SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, MachineFunction &MF,
|
|
FunctionLoweringInfo &FuncInfo) {
|
|
// Define AllNodes here so that memory allocation is reused for
|
|
// each basic block.
|
|
alist<SDNode, LargestSDNode> AllNodes;
|
|
|
|
for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
|
|
SelectBasicBlock(I, MF, FuncInfo, AllNodes);
|
|
AllNodes.clear();
|
|
}
|
|
}
|
|
|
|
void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF,
|
|
FunctionLoweringInfo &FuncInfo,
|
|
alist<SDNode, LargestSDNode> &AllNodes) {
|
|
std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate;
|
|
{
|
|
SelectionDAG DAG(TLI, MF, FuncInfo,
|
|
getAnalysisToUpdate<MachineModuleInfo>(),
|
|
AllNodes);
|
|
CurDAG = &DAG;
|
|
|
|
// First step, lower LLVM code to some DAG. This DAG may use operations and
|
|
// types that are not supported by the target.
|
|
BuildSelectionDAG(DAG, LLVMBB, PHINodesToUpdate, FuncInfo);
|
|
|
|
// Second step, emit the lowered DAG as machine code.
|
|
CodeGenAndEmitDAG(DAG);
|
|
}
|
|
|
|
DOUT << "Total amount of phi nodes to update: "
|
|
<< PHINodesToUpdate.size() << "\n";
|
|
DEBUG(for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i)
|
|
DOUT << "Node " << i << " : (" << PHINodesToUpdate[i].first
|
|
<< ", " << PHINodesToUpdate[i].second << ")\n";);
|
|
|
|
// Next, now that we know what the last MBB the LLVM BB expanded is, update
|
|
// PHI nodes in successors.
|
|
if (SwitchCases.empty() && JTCases.empty() && BitTestCases.empty()) {
|
|
for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) {
|
|
MachineInstr *PHI = PHINodesToUpdate[i].first;
|
|
assert(PHI->getOpcode() == TargetInstrInfo::PHI &&
|
|
"This is not a machine PHI node that we are updating!");
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[i].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(BB));
|
|
}
|
|
return;
|
|
}
|
|
|
|
for (unsigned i = 0, e = BitTestCases.size(); i != e; ++i) {
|
|
// Lower header first, if it wasn't already lowered
|
|
if (!BitTestCases[i].Emitted) {
|
|
SelectionDAG HSDAG(TLI, MF, FuncInfo,
|
|
getAnalysisToUpdate<MachineModuleInfo>(),
|
|
AllNodes);
|
|
CurDAG = &HSDAG;
|
|
SelectionDAGLowering HSDL(HSDAG, TLI, *AA, FuncInfo, GCI);
|
|
// Set the current basic block to the mbb we wish to insert the code into
|
|
BB = BitTestCases[i].Parent;
|
|
HSDL.setCurrentBasicBlock(BB);
|
|
// Emit the code
|
|
HSDL.visitBitTestHeader(BitTestCases[i]);
|
|
HSDAG.setRoot(HSDL.getRoot());
|
|
CodeGenAndEmitDAG(HSDAG);
|
|
}
|
|
|
|
for (unsigned j = 0, ej = BitTestCases[i].Cases.size(); j != ej; ++j) {
|
|
SelectionDAG BSDAG(TLI, MF, FuncInfo,
|
|
getAnalysisToUpdate<MachineModuleInfo>(),
|
|
AllNodes);
|
|
CurDAG = &BSDAG;
|
|
SelectionDAGLowering BSDL(BSDAG, TLI, *AA, FuncInfo, GCI);
|
|
// Set the current basic block to the mbb we wish to insert the code into
|
|
BB = BitTestCases[i].Cases[j].ThisBB;
|
|
BSDL.setCurrentBasicBlock(BB);
|
|
// Emit the code
|
|
if (j+1 != ej)
|
|
BSDL.visitBitTestCase(BitTestCases[i].Cases[j+1].ThisBB,
|
|
BitTestCases[i].Reg,
|
|
BitTestCases[i].Cases[j]);
|
|
else
|
|
BSDL.visitBitTestCase(BitTestCases[i].Default,
|
|
BitTestCases[i].Reg,
|
|
BitTestCases[i].Cases[j]);
|
|
|
|
|
|
BSDAG.setRoot(BSDL.getRoot());
|
|
CodeGenAndEmitDAG(BSDAG);
|
|
}
|
|
|
|
// Update PHI Nodes
|
|
for (unsigned pi = 0, pe = PHINodesToUpdate.size(); pi != pe; ++pi) {
|
|
MachineInstr *PHI = PHINodesToUpdate[pi].first;
|
|
MachineBasicBlock *PHIBB = PHI->getParent();
|
|
assert(PHI->getOpcode() == TargetInstrInfo::PHI &&
|
|
"This is not a machine PHI node that we are updating!");
|
|
// This is "default" BB. We have two jumps to it. From "header" BB and
|
|
// from last "case" BB.
|
|
if (PHIBB == BitTestCases[i].Default) {
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[pi].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(BitTestCases[i].Parent));
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[pi].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(BitTestCases[i].Cases.
|
|
back().ThisBB));
|
|
}
|
|
// One of "cases" BB.
|
|
for (unsigned j = 0, ej = BitTestCases[i].Cases.size(); j != ej; ++j) {
|
|
MachineBasicBlock* cBB = BitTestCases[i].Cases[j].ThisBB;
|
|
if (cBB->succ_end() !=
|
|
std::find(cBB->succ_begin(),cBB->succ_end(), PHIBB)) {
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[pi].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(cBB));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If the JumpTable record is filled in, then we need to emit a jump table.
|
|
// Updating the PHI nodes is tricky in this case, since we need to determine
|
|
// whether the PHI is a successor of the range check MBB or the jump table MBB
|
|
for (unsigned i = 0, e = JTCases.size(); i != e; ++i) {
|
|
// Lower header first, if it wasn't already lowered
|
|
if (!JTCases[i].first.Emitted) {
|
|
SelectionDAG HSDAG(TLI, MF, FuncInfo,
|
|
getAnalysisToUpdate<MachineModuleInfo>(),
|
|
AllNodes);
|
|
CurDAG = &HSDAG;
|
|
SelectionDAGLowering HSDL(HSDAG, TLI, *AA, FuncInfo, GCI);
|
|
// Set the current basic block to the mbb we wish to insert the code into
|
|
BB = JTCases[i].first.HeaderBB;
|
|
HSDL.setCurrentBasicBlock(BB);
|
|
// Emit the code
|
|
HSDL.visitJumpTableHeader(JTCases[i].second, JTCases[i].first);
|
|
HSDAG.setRoot(HSDL.getRoot());
|
|
CodeGenAndEmitDAG(HSDAG);
|
|
}
|
|
|
|
SelectionDAG JSDAG(TLI, MF, FuncInfo,
|
|
getAnalysisToUpdate<MachineModuleInfo>(),
|
|
AllNodes);
|
|
CurDAG = &JSDAG;
|
|
SelectionDAGLowering JSDL(JSDAG, TLI, *AA, FuncInfo, GCI);
|
|
// Set the current basic block to the mbb we wish to insert the code into
|
|
BB = JTCases[i].second.MBB;
|
|
JSDL.setCurrentBasicBlock(BB);
|
|
// Emit the code
|
|
JSDL.visitJumpTable(JTCases[i].second);
|
|
JSDAG.setRoot(JSDL.getRoot());
|
|
CodeGenAndEmitDAG(JSDAG);
|
|
|
|
// Update PHI Nodes
|
|
for (unsigned pi = 0, pe = PHINodesToUpdate.size(); pi != pe; ++pi) {
|
|
MachineInstr *PHI = PHINodesToUpdate[pi].first;
|
|
MachineBasicBlock *PHIBB = PHI->getParent();
|
|
assert(PHI->getOpcode() == TargetInstrInfo::PHI &&
|
|
"This is not a machine PHI node that we are updating!");
|
|
// "default" BB. We can go there only from header BB.
|
|
if (PHIBB == JTCases[i].second.Default) {
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[pi].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(JTCases[i].first.HeaderBB));
|
|
}
|
|
// JT BB. Just iterate over successors here
|
|
if (BB->succ_end() != std::find(BB->succ_begin(),BB->succ_end(), PHIBB)) {
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[pi].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(BB));
|
|
}
|
|
}
|
|
}
|
|
|
|
// If the switch block involved a branch to one of the actual successors, we
|
|
// need to update PHI nodes in that block.
|
|
for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) {
|
|
MachineInstr *PHI = PHINodesToUpdate[i].first;
|
|
assert(PHI->getOpcode() == TargetInstrInfo::PHI &&
|
|
"This is not a machine PHI node that we are updating!");
|
|
if (BB->isSuccessor(PHI->getParent())) {
|
|
PHI->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[i].second,
|
|
false));
|
|
PHI->addOperand(MachineOperand::CreateMBB(BB));
|
|
}
|
|
}
|
|
|
|
// If we generated any switch lowering information, build and codegen any
|
|
// additional DAGs necessary.
|
|
for (unsigned i = 0, e = SwitchCases.size(); i != e; ++i) {
|
|
SelectionDAG SDAG(TLI, MF, FuncInfo,
|
|
getAnalysisToUpdate<MachineModuleInfo>(),
|
|
AllNodes);
|
|
CurDAG = &SDAG;
|
|
SelectionDAGLowering SDL(SDAG, TLI, *AA, FuncInfo, GCI);
|
|
|
|
// Set the current basic block to the mbb we wish to insert the code into
|
|
BB = SwitchCases[i].ThisBB;
|
|
SDL.setCurrentBasicBlock(BB);
|
|
|
|
// Emit the code
|
|
SDL.visitSwitchCase(SwitchCases[i]);
|
|
SDAG.setRoot(SDL.getRoot());
|
|
CodeGenAndEmitDAG(SDAG);
|
|
|
|
// Handle any PHI nodes in successors of this chunk, as if we were coming
|
|
// from the original BB before switch expansion. Note that PHI nodes can
|
|
// occur multiple times in PHINodesToUpdate. We have to be very careful to
|
|
// handle them the right number of times.
|
|
while ((BB = SwitchCases[i].TrueBB)) { // Handle LHS and RHS.
|
|
for (MachineBasicBlock::iterator Phi = BB->begin();
|
|
Phi != BB->end() && Phi->getOpcode() == TargetInstrInfo::PHI; ++Phi){
|
|
// This value for this PHI node is recorded in PHINodesToUpdate, get it.
|
|
for (unsigned pn = 0; ; ++pn) {
|
|
assert(pn != PHINodesToUpdate.size() && "Didn't find PHI entry!");
|
|
if (PHINodesToUpdate[pn].first == Phi) {
|
|
Phi->addOperand(MachineOperand::CreateReg(PHINodesToUpdate[pn].
|
|
second, false));
|
|
Phi->addOperand(MachineOperand::CreateMBB(SwitchCases[i].ThisBB));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Don't process RHS if same block as LHS.
|
|
if (BB == SwitchCases[i].FalseBB)
|
|
SwitchCases[i].FalseBB = 0;
|
|
|
|
// If we haven't handled the RHS, do so now. Otherwise, we're done.
|
|
SwitchCases[i].TrueBB = SwitchCases[i].FalseBB;
|
|
SwitchCases[i].FalseBB = 0;
|
|
}
|
|
assert(SwitchCases[i].TrueBB == 0 && SwitchCases[i].FalseBB == 0);
|
|
}
|
|
}
|
|
|
|
|
|
/// Schedule - Pick a safe ordering for instructions for each
|
|
/// target node in the graph.
|
|
///
|
|
ScheduleDAG *SelectionDAGISel::Schedule(SelectionDAG &DAG) {
|
|
if (ViewSchedDAGs) DAG.viewGraph();
|
|
|
|
RegisterScheduler::FunctionPassCtor Ctor = RegisterScheduler::getDefault();
|
|
|
|
if (!Ctor) {
|
|
Ctor = ISHeuristic;
|
|
RegisterScheduler::setDefault(Ctor);
|
|
}
|
|
|
|
ScheduleDAG *Scheduler = Ctor(this, &DAG, BB, FastISel);
|
|
Scheduler->Run();
|
|
|
|
if (ViewSUnitDAGs) Scheduler->viewGraph();
|
|
return Scheduler;
|
|
}
|
|
|
|
|
|
HazardRecognizer *SelectionDAGISel::CreateTargetHazardRecognizer() {
|
|
return new HazardRecognizer();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Helper functions used by the generated instruction selector.
|
|
//===----------------------------------------------------------------------===//
|
|
// Calls to these methods are generated by tblgen.
|
|
|
|
/// CheckAndMask - The isel is trying to match something like (and X, 255). If
|
|
/// the dag combiner simplified the 255, we still want to match. RHS is the
|
|
/// actual value in the DAG on the RHS of an AND, and DesiredMaskS is the value
|
|
/// specified in the .td file (e.g. 255).
|
|
bool SelectionDAGISel::CheckAndMask(SDOperand LHS, ConstantSDNode *RHS,
|
|
int64_t DesiredMaskS) const {
|
|
const APInt &ActualMask = RHS->getAPIntValue();
|
|
const APInt &DesiredMask = APInt(LHS.getValueSizeInBits(), DesiredMaskS);
|
|
|
|
// If the actual mask exactly matches, success!
|
|
if (ActualMask == DesiredMask)
|
|
return true;
|
|
|
|
// If the actual AND mask is allowing unallowed bits, this doesn't match.
|
|
if (ActualMask.intersects(~DesiredMask))
|
|
return false;
|
|
|
|
// Otherwise, the DAG Combiner may have proven that the value coming in is
|
|
// either already zero or is not demanded. Check for known zero input bits.
|
|
APInt NeededMask = DesiredMask & ~ActualMask;
|
|
if (CurDAG->MaskedValueIsZero(LHS, NeededMask))
|
|
return true;
|
|
|
|
// TODO: check to see if missing bits are just not demanded.
|
|
|
|
// Otherwise, this pattern doesn't match.
|
|
return false;
|
|
}
|
|
|
|
/// CheckOrMask - The isel is trying to match something like (or X, 255). If
|
|
/// the dag combiner simplified the 255, we still want to match. RHS is the
|
|
/// actual value in the DAG on the RHS of an OR, and DesiredMaskS is the value
|
|
/// specified in the .td file (e.g. 255).
|
|
bool SelectionDAGISel::CheckOrMask(SDOperand LHS, ConstantSDNode *RHS,
|
|
int64_t DesiredMaskS) const {
|
|
const APInt &ActualMask = RHS->getAPIntValue();
|
|
const APInt &DesiredMask = APInt(LHS.getValueSizeInBits(), DesiredMaskS);
|
|
|
|
// If the actual mask exactly matches, success!
|
|
if (ActualMask == DesiredMask)
|
|
return true;
|
|
|
|
// If the actual AND mask is allowing unallowed bits, this doesn't match.
|
|
if (ActualMask.intersects(~DesiredMask))
|
|
return false;
|
|
|
|
// Otherwise, the DAG Combiner may have proven that the value coming in is
|
|
// either already zero or is not demanded. Check for known zero input bits.
|
|
APInt NeededMask = DesiredMask & ~ActualMask;
|
|
|
|
APInt KnownZero, KnownOne;
|
|
CurDAG->ComputeMaskedBits(LHS, NeededMask, KnownZero, KnownOne);
|
|
|
|
// If all the missing bits in the or are already known to be set, match!
|
|
if ((NeededMask & KnownOne) == NeededMask)
|
|
return true;
|
|
|
|
// TODO: check to see if missing bits are just not demanded.
|
|
|
|
// Otherwise, this pattern doesn't match.
|
|
return false;
|
|
}
|
|
|
|
|
|
/// SelectInlineAsmMemoryOperands - Calls to this are automatically generated
|
|
/// by tblgen. Others should not call it.
|
|
void SelectionDAGISel::
|
|
SelectInlineAsmMemoryOperands(std::vector<SDOperand> &Ops, SelectionDAG &DAG) {
|
|
std::vector<SDOperand> InOps;
|
|
std::swap(InOps, Ops);
|
|
|
|
Ops.push_back(InOps[0]); // input chain.
|
|
Ops.push_back(InOps[1]); // input asm string.
|
|
|
|
unsigned i = 2, e = InOps.size();
|
|
if (InOps[e-1].getValueType() == MVT::Flag)
|
|
--e; // Don't process a flag operand if it is here.
|
|
|
|
while (i != e) {
|
|
unsigned Flags = cast<ConstantSDNode>(InOps[i])->getValue();
|
|
if ((Flags & 7) != 4 /*MEM*/) {
|
|
// Just skip over this operand, copying the operands verbatim.
|
|
Ops.insert(Ops.end(), InOps.begin()+i, InOps.begin()+i+(Flags >> 3) + 1);
|
|
i += (Flags >> 3) + 1;
|
|
} else {
|
|
assert((Flags >> 3) == 1 && "Memory operand with multiple values?");
|
|
// Otherwise, this is a memory operand. Ask the target to select it.
|
|
std::vector<SDOperand> SelOps;
|
|
if (SelectInlineAsmMemoryOperand(InOps[i+1], 'm', SelOps, DAG)) {
|
|
cerr << "Could not match memory address. Inline asm failure!\n";
|
|
exit(1);
|
|
}
|
|
|
|
// Add this to the output node.
|
|
MVT IntPtrTy = DAG.getTargetLoweringInfo().getPointerTy();
|
|
Ops.push_back(DAG.getTargetConstant(4/*MEM*/ | (SelOps.size() << 3),
|
|
IntPtrTy));
|
|
Ops.insert(Ops.end(), SelOps.begin(), SelOps.end());
|
|
i += 2;
|
|
}
|
|
}
|
|
|
|
// Add the flag input back if present.
|
|
if (e != InOps.size())
|
|
Ops.push_back(InOps.back());
|
|
}
|
|
|
|
char SelectionDAGISel::ID = 0;
|