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https://github.com/c64scene-ar/llvm-6502.git
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97d853451e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97709 91177308-0d34-0410-b5e6-96231b3b80d8
1933 lines
71 KiB
C++
1933 lines
71 KiB
C++
//===- X86ISelDAGToDAG.cpp - A DAG pattern matching inst selector for X86 -===//
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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 file defines a DAG pattern matching instruction selector for X86,
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// converting from a legalized dag to a X86 dag.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "x86-isel"
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#include "X86.h"
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#include "X86InstrBuilder.h"
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#include "X86ISelLowering.h"
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#include "X86MachineFunctionInfo.h"
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#include "X86RegisterInfo.h"
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#include "X86Subtarget.h"
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#include "X86TargetMachine.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Type.h"
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#include "llvm/CodeGen/MachineConstantPool.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/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAGISel.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/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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STATISTIC(NumLoadMoved, "Number of loads moved below TokenFactor");
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//===----------------------------------------------------------------------===//
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// Pattern Matcher Implementation
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//===----------------------------------------------------------------------===//
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namespace {
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/// X86ISelAddressMode - This corresponds to X86AddressMode, but uses
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/// SDValue's instead of register numbers for the leaves of the matched
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/// tree.
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struct X86ISelAddressMode {
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enum {
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RegBase,
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FrameIndexBase
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} BaseType;
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struct { // This is really a union, discriminated by BaseType!
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SDValue Reg;
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int FrameIndex;
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} Base;
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unsigned Scale;
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SDValue IndexReg;
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int32_t Disp;
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SDValue Segment;
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GlobalValue *GV;
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Constant *CP;
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BlockAddress *BlockAddr;
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const char *ES;
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int JT;
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unsigned Align; // CP alignment.
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unsigned char SymbolFlags; // X86II::MO_*
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X86ISelAddressMode()
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: BaseType(RegBase), Scale(1), IndexReg(), Disp(0),
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Segment(), GV(0), CP(0), BlockAddr(0), ES(0), JT(-1), Align(0),
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SymbolFlags(X86II::MO_NO_FLAG) {
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}
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bool hasSymbolicDisplacement() const {
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return GV != 0 || CP != 0 || ES != 0 || JT != -1 || BlockAddr != 0;
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}
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bool hasBaseOrIndexReg() const {
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return IndexReg.getNode() != 0 || Base.Reg.getNode() != 0;
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}
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/// isRIPRelative - Return true if this addressing mode is already RIP
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/// relative.
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bool isRIPRelative() const {
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if (BaseType != RegBase) return false;
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if (RegisterSDNode *RegNode =
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dyn_cast_or_null<RegisterSDNode>(Base.Reg.getNode()))
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return RegNode->getReg() == X86::RIP;
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return false;
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}
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void setBaseReg(SDValue Reg) {
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BaseType = RegBase;
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Base.Reg = Reg;
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}
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void dump() {
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dbgs() << "X86ISelAddressMode " << this << '\n';
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dbgs() << "Base.Reg ";
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if (Base.Reg.getNode() != 0)
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Base.Reg.getNode()->dump();
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else
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dbgs() << "nul";
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dbgs() << " Base.FrameIndex " << Base.FrameIndex << '\n'
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<< " Scale" << Scale << '\n'
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<< "IndexReg ";
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if (IndexReg.getNode() != 0)
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IndexReg.getNode()->dump();
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else
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dbgs() << "nul";
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dbgs() << " Disp " << Disp << '\n'
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<< "GV ";
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if (GV)
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GV->dump();
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else
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dbgs() << "nul";
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dbgs() << " CP ";
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if (CP)
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CP->dump();
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else
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dbgs() << "nul";
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dbgs() << '\n'
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<< "ES ";
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if (ES)
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dbgs() << ES;
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else
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dbgs() << "nul";
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dbgs() << " JT" << JT << " Align" << Align << '\n';
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}
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};
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}
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namespace {
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//===--------------------------------------------------------------------===//
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/// ISel - X86 specific code to select X86 machine instructions for
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/// SelectionDAG operations.
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///
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class X86DAGToDAGISel : public SelectionDAGISel {
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/// X86Lowering - This object fully describes how to lower LLVM code to an
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/// X86-specific SelectionDAG.
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X86TargetLowering &X86Lowering;
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/// Subtarget - Keep a pointer to the X86Subtarget around so that we can
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/// make the right decision when generating code for different targets.
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const X86Subtarget *Subtarget;
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/// OptForSize - If true, selector should try to optimize for code size
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/// instead of performance.
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bool OptForSize;
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public:
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explicit X86DAGToDAGISel(X86TargetMachine &tm, CodeGenOpt::Level OptLevel)
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: SelectionDAGISel(tm, OptLevel),
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X86Lowering(*tm.getTargetLowering()),
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Subtarget(&tm.getSubtarget<X86Subtarget>()),
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OptForSize(false) {}
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virtual const char *getPassName() const {
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return "X86 DAG->DAG Instruction Selection";
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}
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virtual void EmitFunctionEntryCode(Function &Fn, MachineFunction &MF);
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virtual bool IsProfitableToFold(SDValue N, SDNode *U, SDNode *Root) const;
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virtual void PreprocessISelDAG();
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// Include the pieces autogenerated from the target description.
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#include "X86GenDAGISel.inc"
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private:
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SDNode *Select(SDNode *N);
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SDNode *SelectAtomic64(SDNode *Node, unsigned Opc);
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SDNode *SelectAtomicLoadAdd(SDNode *Node, EVT NVT);
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bool MatchSegmentBaseAddress(SDValue N, X86ISelAddressMode &AM);
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bool MatchLoad(SDValue N, X86ISelAddressMode &AM);
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bool MatchWrapper(SDValue N, X86ISelAddressMode &AM);
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bool MatchAddress(SDValue N, X86ISelAddressMode &AM);
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bool MatchAddressRecursively(SDValue N, X86ISelAddressMode &AM,
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unsigned Depth);
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bool MatchAddressBase(SDValue N, X86ISelAddressMode &AM);
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bool SelectAddr(SDNode *Op, SDValue N, SDValue &Base,
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SDValue &Scale, SDValue &Index, SDValue &Disp,
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SDValue &Segment);
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bool SelectLEAAddr(SDNode *Op, SDValue N, SDValue &Base,
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SDValue &Scale, SDValue &Index, SDValue &Disp);
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bool SelectTLSADDRAddr(SDNode *Op, SDValue N, SDValue &Base,
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SDValue &Scale, SDValue &Index, SDValue &Disp);
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bool SelectScalarSSELoad(SDNode *Root, SDValue N,
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SDValue &Base, SDValue &Scale,
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SDValue &Index, SDValue &Disp,
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SDValue &Segment,
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SDValue &NodeWithChain);
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bool TryFoldLoad(SDNode *P, SDValue N,
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SDValue &Base, SDValue &Scale,
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SDValue &Index, SDValue &Disp,
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SDValue &Segment);
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/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
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/// inline asm expressions.
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virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
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char ConstraintCode,
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std::vector<SDValue> &OutOps);
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void EmitSpecialCodeForMain(MachineBasicBlock *BB, MachineFrameInfo *MFI);
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inline void getAddressOperands(X86ISelAddressMode &AM, SDValue &Base,
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SDValue &Scale, SDValue &Index,
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SDValue &Disp, SDValue &Segment) {
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Base = (AM.BaseType == X86ISelAddressMode::FrameIndexBase) ?
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CurDAG->getTargetFrameIndex(AM.Base.FrameIndex, TLI.getPointerTy()) :
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AM.Base.Reg;
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Scale = getI8Imm(AM.Scale);
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Index = AM.IndexReg;
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// These are 32-bit even in 64-bit mode since RIP relative offset
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// is 32-bit.
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if (AM.GV)
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Disp = CurDAG->getTargetGlobalAddress(AM.GV, MVT::i32, AM.Disp,
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AM.SymbolFlags);
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else if (AM.CP)
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Disp = CurDAG->getTargetConstantPool(AM.CP, MVT::i32,
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AM.Align, AM.Disp, AM.SymbolFlags);
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else if (AM.ES)
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Disp = CurDAG->getTargetExternalSymbol(AM.ES, MVT::i32, AM.SymbolFlags);
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else if (AM.JT != -1)
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Disp = CurDAG->getTargetJumpTable(AM.JT, MVT::i32, AM.SymbolFlags);
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else if (AM.BlockAddr)
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Disp = CurDAG->getBlockAddress(AM.BlockAddr, MVT::i32,
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true, AM.SymbolFlags);
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else
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Disp = CurDAG->getTargetConstant(AM.Disp, MVT::i32);
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if (AM.Segment.getNode())
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Segment = AM.Segment;
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else
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Segment = CurDAG->getRegister(0, MVT::i32);
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}
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/// getI8Imm - Return a target constant with the specified value, of type
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/// i8.
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inline SDValue getI8Imm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i8);
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}
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/// getI16Imm - Return a target constant with the specified value, of type
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/// i16.
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inline SDValue getI16Imm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i16);
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}
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/// getI32Imm - Return a target constant with the specified value, of type
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/// i32.
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inline SDValue getI32Imm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i32);
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}
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/// getGlobalBaseReg - Return an SDNode that returns the value of
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/// the global base register. Output instructions required to
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/// initialize the global base register, if necessary.
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///
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SDNode *getGlobalBaseReg();
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/// getTargetMachine - Return a reference to the TargetMachine, casted
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/// to the target-specific type.
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const X86TargetMachine &getTargetMachine() {
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return static_cast<const X86TargetMachine &>(TM);
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}
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/// getInstrInfo - Return a reference to the TargetInstrInfo, casted
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/// to the target-specific type.
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const X86InstrInfo *getInstrInfo() {
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return getTargetMachine().getInstrInfo();
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}
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};
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}
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bool
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X86DAGToDAGISel::IsProfitableToFold(SDValue N, SDNode *U, SDNode *Root) const {
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if (OptLevel == CodeGenOpt::None) return false;
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if (!N.hasOneUse())
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return false;
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if (N.getOpcode() != ISD::LOAD)
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return true;
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// If N is a load, do additional profitability checks.
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if (U == Root) {
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switch (U->getOpcode()) {
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default: break;
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case X86ISD::ADD:
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case X86ISD::SUB:
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case X86ISD::AND:
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case X86ISD::XOR:
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case X86ISD::OR:
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case ISD::ADD:
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case ISD::ADDC:
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case ISD::ADDE:
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case ISD::AND:
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case ISD::OR:
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case ISD::XOR: {
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SDValue Op1 = U->getOperand(1);
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// If the other operand is a 8-bit immediate we should fold the immediate
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// instead. This reduces code size.
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// e.g.
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// movl 4(%esp), %eax
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// addl $4, %eax
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// vs.
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// movl $4, %eax
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// addl 4(%esp), %eax
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// The former is 2 bytes shorter. In case where the increment is 1, then
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// the saving can be 4 bytes (by using incl %eax).
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if (ConstantSDNode *Imm = dyn_cast<ConstantSDNode>(Op1))
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if (Imm->getAPIntValue().isSignedIntN(8))
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return false;
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// If the other operand is a TLS address, we should fold it instead.
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// This produces
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// movl %gs:0, %eax
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// leal i@NTPOFF(%eax), %eax
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// instead of
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// movl $i@NTPOFF, %eax
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// addl %gs:0, %eax
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// if the block also has an access to a second TLS address this will save
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// a load.
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// FIXME: This is probably also true for non TLS addresses.
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if (Op1.getOpcode() == X86ISD::Wrapper) {
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SDValue Val = Op1.getOperand(0);
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if (Val.getOpcode() == ISD::TargetGlobalTLSAddress)
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return false;
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}
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}
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}
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}
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return true;
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}
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/// MoveBelowCallSeqStart - Replace CALLSEQ_START operand with load's chain
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/// operand and move load below the call's chain operand.
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static void MoveBelowCallSeqStart(SelectionDAG *CurDAG, SDValue Load,
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SDValue Call, SDValue CallSeqStart) {
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SmallVector<SDValue, 8> Ops;
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SDValue Chain = CallSeqStart.getOperand(0);
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if (Chain.getNode() == Load.getNode())
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Ops.push_back(Load.getOperand(0));
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else {
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assert(Chain.getOpcode() == ISD::TokenFactor &&
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"Unexpected CallSeqStart chain operand");
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for (unsigned i = 0, e = Chain.getNumOperands(); i != e; ++i)
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if (Chain.getOperand(i).getNode() == Load.getNode())
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Ops.push_back(Load.getOperand(0));
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else
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Ops.push_back(Chain.getOperand(i));
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SDValue NewChain =
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CurDAG->getNode(ISD::TokenFactor, Load.getDebugLoc(),
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MVT::Other, &Ops[0], Ops.size());
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Ops.clear();
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Ops.push_back(NewChain);
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}
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for (unsigned i = 1, e = CallSeqStart.getNumOperands(); i != e; ++i)
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Ops.push_back(CallSeqStart.getOperand(i));
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CurDAG->UpdateNodeOperands(CallSeqStart, &Ops[0], Ops.size());
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CurDAG->UpdateNodeOperands(Load, Call.getOperand(0),
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Load.getOperand(1), Load.getOperand(2));
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Ops.clear();
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Ops.push_back(SDValue(Load.getNode(), 1));
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for (unsigned i = 1, e = Call.getNode()->getNumOperands(); i != e; ++i)
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Ops.push_back(Call.getOperand(i));
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CurDAG->UpdateNodeOperands(Call, &Ops[0], Ops.size());
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}
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/// isCalleeLoad - Return true if call address is a load and it can be
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/// moved below CALLSEQ_START and the chains leading up to the call.
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/// Return the CALLSEQ_START by reference as a second output.
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static bool isCalleeLoad(SDValue Callee, SDValue &Chain) {
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if (Callee.getNode() == Chain.getNode() || !Callee.hasOneUse())
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return false;
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LoadSDNode *LD = dyn_cast<LoadSDNode>(Callee.getNode());
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if (!LD ||
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LD->isVolatile() ||
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LD->getAddressingMode() != ISD::UNINDEXED ||
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LD->getExtensionType() != ISD::NON_EXTLOAD)
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return false;
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// Now let's find the callseq_start.
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while (Chain.getOpcode() != ISD::CALLSEQ_START) {
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if (!Chain.hasOneUse())
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return false;
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Chain = Chain.getOperand(0);
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}
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if (Chain.getOperand(0).getNode() == Callee.getNode())
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return true;
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if (Chain.getOperand(0).getOpcode() == ISD::TokenFactor &&
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Callee.getValue(1).isOperandOf(Chain.getOperand(0).getNode()) &&
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Callee.getValue(1).hasOneUse())
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return true;
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return false;
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}
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void X86DAGToDAGISel::PreprocessISelDAG() {
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// OptForSize is used in pattern predicates that isel is matching.
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OptForSize = MF->getFunction()->hasFnAttr(Attribute::OptimizeForSize);
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for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
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E = CurDAG->allnodes_end(); I != E; ) {
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SDNode *N = I++; // Preincrement iterator to avoid invalidation issues.
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if (OptLevel != CodeGenOpt::None && N->getOpcode() == X86ISD::CALL) {
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/// Also try moving call address load from outside callseq_start to just
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/// before the call to allow it to be folded.
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///
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/// [Load chain]
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/// ^
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/// |
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/// [Load]
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/// ^ ^
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/// | |
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/// / \--
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/// / |
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///[CALLSEQ_START] |
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/// ^ |
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/// | |
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/// [LOAD/C2Reg] |
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/// | |
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/// \ /
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/// \ /
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/// [CALL]
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SDValue Chain = N->getOperand(0);
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SDValue Load = N->getOperand(1);
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if (!isCalleeLoad(Load, Chain))
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continue;
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MoveBelowCallSeqStart(CurDAG, Load, SDValue(N, 0), Chain);
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++NumLoadMoved;
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continue;
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}
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// Lower fpround and fpextend nodes that target the FP stack to be store and
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// load to the stack. This is a gross hack. We would like to simply mark
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// these as being illegal, but when we do that, legalize produces these when
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// it expands calls, then expands these in the same legalize pass. We would
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// like dag combine to be able to hack on these between the call expansion
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// and the node legalization. As such this pass basically does "really
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// late" legalization of these inline with the X86 isel pass.
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// FIXME: This should only happen when not compiled with -O0.
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if (N->getOpcode() != ISD::FP_ROUND && N->getOpcode() != ISD::FP_EXTEND)
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continue;
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// If the source and destination are SSE registers, then this is a legal
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// conversion that should not be lowered.
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EVT SrcVT = N->getOperand(0).getValueType();
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EVT DstVT = N->getValueType(0);
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bool SrcIsSSE = X86Lowering.isScalarFPTypeInSSEReg(SrcVT);
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bool DstIsSSE = X86Lowering.isScalarFPTypeInSSEReg(DstVT);
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if (SrcIsSSE && DstIsSSE)
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continue;
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if (!SrcIsSSE && !DstIsSSE) {
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// If this is an FPStack extension, it is a noop.
|
|
if (N->getOpcode() == ISD::FP_EXTEND)
|
|
continue;
|
|
// If this is a value-preserving FPStack truncation, it is a noop.
|
|
if (N->getConstantOperandVal(1))
|
|
continue;
|
|
}
|
|
|
|
// Here we could have an FP stack truncation or an FPStack <-> SSE convert.
|
|
// FPStack has extload and truncstore. SSE can fold direct loads into other
|
|
// operations. Based on this, decide what we want to do.
|
|
EVT MemVT;
|
|
if (N->getOpcode() == ISD::FP_ROUND)
|
|
MemVT = DstVT; // FP_ROUND must use DstVT, we can't do a 'trunc load'.
|
|
else
|
|
MemVT = SrcIsSSE ? SrcVT : DstVT;
|
|
|
|
SDValue MemTmp = CurDAG->CreateStackTemporary(MemVT);
|
|
DebugLoc dl = N->getDebugLoc();
|
|
|
|
// FIXME: optimize the case where the src/dest is a load or store?
|
|
SDValue Store = CurDAG->getTruncStore(CurDAG->getEntryNode(), dl,
|
|
N->getOperand(0),
|
|
MemTmp, NULL, 0, MemVT,
|
|
false, false, 0);
|
|
SDValue Result = CurDAG->getExtLoad(ISD::EXTLOAD, dl, DstVT, Store, MemTmp,
|
|
NULL, 0, MemVT, false, false, 0);
|
|
|
|
// We're about to replace all uses of the FP_ROUND/FP_EXTEND with the
|
|
// extload we created. This will cause general havok on the dag because
|
|
// anything below the conversion could be folded into other existing nodes.
|
|
// To avoid invalidating 'I', back it up to the convert node.
|
|
--I;
|
|
CurDAG->ReplaceAllUsesOfValueWith(SDValue(N, 0), Result);
|
|
|
|
// Now that we did that, the node is dead. Increment the iterator to the
|
|
// next node to process, then delete N.
|
|
++I;
|
|
CurDAG->DeleteNode(N);
|
|
}
|
|
}
|
|
|
|
|
|
/// EmitSpecialCodeForMain - Emit any code that needs to be executed only in
|
|
/// the main function.
|
|
void X86DAGToDAGISel::EmitSpecialCodeForMain(MachineBasicBlock *BB,
|
|
MachineFrameInfo *MFI) {
|
|
const TargetInstrInfo *TII = TM.getInstrInfo();
|
|
if (Subtarget->isTargetCygMing())
|
|
BuildMI(BB, DebugLoc::getUnknownLoc(),
|
|
TII->get(X86::CALLpcrel32)).addExternalSymbol("__main");
|
|
}
|
|
|
|
void X86DAGToDAGISel::EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {
|
|
// If this is main, emit special code for main.
|
|
MachineBasicBlock *BB = MF.begin();
|
|
if (Fn.hasExternalLinkage() && Fn.getName() == "main")
|
|
EmitSpecialCodeForMain(BB, MF.getFrameInfo());
|
|
}
|
|
|
|
|
|
bool X86DAGToDAGISel::MatchSegmentBaseAddress(SDValue N,
|
|
X86ISelAddressMode &AM) {
|
|
assert(N.getOpcode() == X86ISD::SegmentBaseAddress);
|
|
SDValue Segment = N.getOperand(0);
|
|
|
|
if (AM.Segment.getNode() == 0) {
|
|
AM.Segment = Segment;
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool X86DAGToDAGISel::MatchLoad(SDValue N, X86ISelAddressMode &AM) {
|
|
// This optimization is valid because the GNU TLS model defines that
|
|
// gs:0 (or fs:0 on X86-64) contains its own address.
|
|
// For more information see http://people.redhat.com/drepper/tls.pdf
|
|
|
|
SDValue Address = N.getOperand(1);
|
|
if (Address.getOpcode() == X86ISD::SegmentBaseAddress &&
|
|
!MatchSegmentBaseAddress (Address, AM))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/// MatchWrapper - Try to match X86ISD::Wrapper and X86ISD::WrapperRIP nodes
|
|
/// into an addressing mode. These wrap things that will resolve down into a
|
|
/// symbol reference. If no match is possible, this returns true, otherwise it
|
|
/// returns false.
|
|
bool X86DAGToDAGISel::MatchWrapper(SDValue N, X86ISelAddressMode &AM) {
|
|
// If the addressing mode already has a symbol as the displacement, we can
|
|
// never match another symbol.
|
|
if (AM.hasSymbolicDisplacement())
|
|
return true;
|
|
|
|
SDValue N0 = N.getOperand(0);
|
|
CodeModel::Model M = TM.getCodeModel();
|
|
|
|
// Handle X86-64 rip-relative addresses. We check this before checking direct
|
|
// folding because RIP is preferable to non-RIP accesses.
|
|
if (Subtarget->is64Bit() &&
|
|
// Under X86-64 non-small code model, GV (and friends) are 64-bits, so
|
|
// they cannot be folded into immediate fields.
|
|
// FIXME: This can be improved for kernel and other models?
|
|
(M == CodeModel::Small || M == CodeModel::Kernel) &&
|
|
// Base and index reg must be 0 in order to use %rip as base and lowering
|
|
// must allow RIP.
|
|
!AM.hasBaseOrIndexReg() && N.getOpcode() == X86ISD::WrapperRIP) {
|
|
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(N0)) {
|
|
int64_t Offset = AM.Disp + G->getOffset();
|
|
if (!X86::isOffsetSuitableForCodeModel(Offset, M)) return true;
|
|
AM.GV = G->getGlobal();
|
|
AM.Disp = Offset;
|
|
AM.SymbolFlags = G->getTargetFlags();
|
|
} else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(N0)) {
|
|
int64_t Offset = AM.Disp + CP->getOffset();
|
|
if (!X86::isOffsetSuitableForCodeModel(Offset, M)) return true;
|
|
AM.CP = CP->getConstVal();
|
|
AM.Align = CP->getAlignment();
|
|
AM.Disp = Offset;
|
|
AM.SymbolFlags = CP->getTargetFlags();
|
|
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(N0)) {
|
|
AM.ES = S->getSymbol();
|
|
AM.SymbolFlags = S->getTargetFlags();
|
|
} else if (JumpTableSDNode *J = dyn_cast<JumpTableSDNode>(N0)) {
|
|
AM.JT = J->getIndex();
|
|
AM.SymbolFlags = J->getTargetFlags();
|
|
} else {
|
|
AM.BlockAddr = cast<BlockAddressSDNode>(N0)->getBlockAddress();
|
|
AM.SymbolFlags = cast<BlockAddressSDNode>(N0)->getTargetFlags();
|
|
}
|
|
|
|
if (N.getOpcode() == X86ISD::WrapperRIP)
|
|
AM.setBaseReg(CurDAG->getRegister(X86::RIP, MVT::i64));
|
|
return false;
|
|
}
|
|
|
|
// Handle the case when globals fit in our immediate field: This is true for
|
|
// X86-32 always and X86-64 when in -static -mcmodel=small mode. In 64-bit
|
|
// mode, this results in a non-RIP-relative computation.
|
|
if (!Subtarget->is64Bit() ||
|
|
((M == CodeModel::Small || M == CodeModel::Kernel) &&
|
|
TM.getRelocationModel() == Reloc::Static)) {
|
|
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(N0)) {
|
|
AM.GV = G->getGlobal();
|
|
AM.Disp += G->getOffset();
|
|
AM.SymbolFlags = G->getTargetFlags();
|
|
} else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(N0)) {
|
|
AM.CP = CP->getConstVal();
|
|
AM.Align = CP->getAlignment();
|
|
AM.Disp += CP->getOffset();
|
|
AM.SymbolFlags = CP->getTargetFlags();
|
|
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(N0)) {
|
|
AM.ES = S->getSymbol();
|
|
AM.SymbolFlags = S->getTargetFlags();
|
|
} else if (JumpTableSDNode *J = dyn_cast<JumpTableSDNode>(N0)) {
|
|
AM.JT = J->getIndex();
|
|
AM.SymbolFlags = J->getTargetFlags();
|
|
} else {
|
|
AM.BlockAddr = cast<BlockAddressSDNode>(N0)->getBlockAddress();
|
|
AM.SymbolFlags = cast<BlockAddressSDNode>(N0)->getTargetFlags();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// MatchAddress - Add the specified node to the specified addressing mode,
|
|
/// returning true if it cannot be done. This just pattern matches for the
|
|
/// addressing mode.
|
|
bool X86DAGToDAGISel::MatchAddress(SDValue N, X86ISelAddressMode &AM) {
|
|
if (MatchAddressRecursively(N, AM, 0))
|
|
return true;
|
|
|
|
// Post-processing: Convert lea(,%reg,2) to lea(%reg,%reg), which has
|
|
// a smaller encoding and avoids a scaled-index.
|
|
if (AM.Scale == 2 &&
|
|
AM.BaseType == X86ISelAddressMode::RegBase &&
|
|
AM.Base.Reg.getNode() == 0) {
|
|
AM.Base.Reg = AM.IndexReg;
|
|
AM.Scale = 1;
|
|
}
|
|
|
|
// Post-processing: Convert foo to foo(%rip), even in non-PIC mode,
|
|
// because it has a smaller encoding.
|
|
// TODO: Which other code models can use this?
|
|
if (TM.getCodeModel() == CodeModel::Small &&
|
|
Subtarget->is64Bit() &&
|
|
AM.Scale == 1 &&
|
|
AM.BaseType == X86ISelAddressMode::RegBase &&
|
|
AM.Base.Reg.getNode() == 0 &&
|
|
AM.IndexReg.getNode() == 0 &&
|
|
AM.SymbolFlags == X86II::MO_NO_FLAG &&
|
|
AM.hasSymbolicDisplacement())
|
|
AM.Base.Reg = CurDAG->getRegister(X86::RIP, MVT::i64);
|
|
|
|
return false;
|
|
}
|
|
|
|
bool X86DAGToDAGISel::MatchAddressRecursively(SDValue N, X86ISelAddressMode &AM,
|
|
unsigned Depth) {
|
|
bool is64Bit = Subtarget->is64Bit();
|
|
DebugLoc dl = N.getDebugLoc();
|
|
DEBUG({
|
|
dbgs() << "MatchAddress: ";
|
|
AM.dump();
|
|
});
|
|
// Limit recursion.
|
|
if (Depth > 5)
|
|
return MatchAddressBase(N, AM);
|
|
|
|
CodeModel::Model M = TM.getCodeModel();
|
|
|
|
// If this is already a %rip relative address, we can only merge immediates
|
|
// into it. Instead of handling this in every case, we handle it here.
|
|
// RIP relative addressing: %rip + 32-bit displacement!
|
|
if (AM.isRIPRelative()) {
|
|
// FIXME: JumpTable and ExternalSymbol address currently don't like
|
|
// displacements. It isn't very important, but this should be fixed for
|
|
// consistency.
|
|
if (!AM.ES && AM.JT != -1) return true;
|
|
|
|
if (ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(N)) {
|
|
int64_t Val = AM.Disp + Cst->getSExtValue();
|
|
if (X86::isOffsetSuitableForCodeModel(Val, M,
|
|
AM.hasSymbolicDisplacement())) {
|
|
AM.Disp = Val;
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
switch (N.getOpcode()) {
|
|
default: break;
|
|
case ISD::Constant: {
|
|
uint64_t Val = cast<ConstantSDNode>(N)->getSExtValue();
|
|
if (!is64Bit ||
|
|
X86::isOffsetSuitableForCodeModel(AM.Disp + Val, M,
|
|
AM.hasSymbolicDisplacement())) {
|
|
AM.Disp += Val;
|
|
return false;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case X86ISD::SegmentBaseAddress:
|
|
if (!MatchSegmentBaseAddress(N, AM))
|
|
return false;
|
|
break;
|
|
|
|
case X86ISD::Wrapper:
|
|
case X86ISD::WrapperRIP:
|
|
if (!MatchWrapper(N, AM))
|
|
return false;
|
|
break;
|
|
|
|
case ISD::LOAD:
|
|
if (!MatchLoad(N, AM))
|
|
return false;
|
|
break;
|
|
|
|
case ISD::FrameIndex:
|
|
if (AM.BaseType == X86ISelAddressMode::RegBase
|
|
&& AM.Base.Reg.getNode() == 0) {
|
|
AM.BaseType = X86ISelAddressMode::FrameIndexBase;
|
|
AM.Base.FrameIndex = cast<FrameIndexSDNode>(N)->getIndex();
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case ISD::SHL:
|
|
if (AM.IndexReg.getNode() != 0 || AM.Scale != 1)
|
|
break;
|
|
|
|
if (ConstantSDNode
|
|
*CN = dyn_cast<ConstantSDNode>(N.getNode()->getOperand(1))) {
|
|
unsigned Val = CN->getZExtValue();
|
|
// Note that we handle x<<1 as (,x,2) rather than (x,x) here so
|
|
// that the base operand remains free for further matching. If
|
|
// the base doesn't end up getting used, a post-processing step
|
|
// in MatchAddress turns (,x,2) into (x,x), which is cheaper.
|
|
if (Val == 1 || Val == 2 || Val == 3) {
|
|
AM.Scale = 1 << Val;
|
|
SDValue ShVal = N.getNode()->getOperand(0);
|
|
|
|
// Okay, we know that we have a scale by now. However, if the scaled
|
|
// value is an add of something and a constant, we can fold the
|
|
// constant into the disp field here.
|
|
if (ShVal.getNode()->getOpcode() == ISD::ADD &&
|
|
isa<ConstantSDNode>(ShVal.getNode()->getOperand(1))) {
|
|
AM.IndexReg = ShVal.getNode()->getOperand(0);
|
|
ConstantSDNode *AddVal =
|
|
cast<ConstantSDNode>(ShVal.getNode()->getOperand(1));
|
|
uint64_t Disp = AM.Disp + (AddVal->getSExtValue() << Val);
|
|
if (!is64Bit ||
|
|
X86::isOffsetSuitableForCodeModel(Disp, M,
|
|
AM.hasSymbolicDisplacement()))
|
|
AM.Disp = Disp;
|
|
else
|
|
AM.IndexReg = ShVal;
|
|
} else {
|
|
AM.IndexReg = ShVal;
|
|
}
|
|
return false;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case ISD::SMUL_LOHI:
|
|
case ISD::UMUL_LOHI:
|
|
// A mul_lohi where we need the low part can be folded as a plain multiply.
|
|
if (N.getResNo() != 0) break;
|
|
// FALL THROUGH
|
|
case ISD::MUL:
|
|
case X86ISD::MUL_IMM:
|
|
// X*[3,5,9] -> X+X*[2,4,8]
|
|
if (AM.BaseType == X86ISelAddressMode::RegBase &&
|
|
AM.Base.Reg.getNode() == 0 &&
|
|
AM.IndexReg.getNode() == 0) {
|
|
if (ConstantSDNode
|
|
*CN = dyn_cast<ConstantSDNode>(N.getNode()->getOperand(1)))
|
|
if (CN->getZExtValue() == 3 || CN->getZExtValue() == 5 ||
|
|
CN->getZExtValue() == 9) {
|
|
AM.Scale = unsigned(CN->getZExtValue())-1;
|
|
|
|
SDValue MulVal = N.getNode()->getOperand(0);
|
|
SDValue Reg;
|
|
|
|
// Okay, we know that we have a scale by now. However, if the scaled
|
|
// value is an add of something and a constant, we can fold the
|
|
// constant into the disp field here.
|
|
if (MulVal.getNode()->getOpcode() == ISD::ADD && MulVal.hasOneUse() &&
|
|
isa<ConstantSDNode>(MulVal.getNode()->getOperand(1))) {
|
|
Reg = MulVal.getNode()->getOperand(0);
|
|
ConstantSDNode *AddVal =
|
|
cast<ConstantSDNode>(MulVal.getNode()->getOperand(1));
|
|
uint64_t Disp = AM.Disp + AddVal->getSExtValue() *
|
|
CN->getZExtValue();
|
|
if (!is64Bit ||
|
|
X86::isOffsetSuitableForCodeModel(Disp, M,
|
|
AM.hasSymbolicDisplacement()))
|
|
AM.Disp = Disp;
|
|
else
|
|
Reg = N.getNode()->getOperand(0);
|
|
} else {
|
|
Reg = N.getNode()->getOperand(0);
|
|
}
|
|
|
|
AM.IndexReg = AM.Base.Reg = Reg;
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case ISD::SUB: {
|
|
// Given A-B, if A can be completely folded into the address and
|
|
// the index field with the index field unused, use -B as the index.
|
|
// This is a win if a has multiple parts that can be folded into
|
|
// the address. Also, this saves a mov if the base register has
|
|
// other uses, since it avoids a two-address sub instruction, however
|
|
// it costs an additional mov if the index register has other uses.
|
|
|
|
// Test if the LHS of the sub can be folded.
|
|
X86ISelAddressMode Backup = AM;
|
|
if (MatchAddressRecursively(N.getNode()->getOperand(0), AM, Depth+1)) {
|
|
AM = Backup;
|
|
break;
|
|
}
|
|
// Test if the index field is free for use.
|
|
if (AM.IndexReg.getNode() || AM.isRIPRelative()) {
|
|
AM = Backup;
|
|
break;
|
|
}
|
|
int Cost = 0;
|
|
SDValue RHS = N.getNode()->getOperand(1);
|
|
// If the RHS involves a register with multiple uses, this
|
|
// transformation incurs an extra mov, due to the neg instruction
|
|
// clobbering its operand.
|
|
if (!RHS.getNode()->hasOneUse() ||
|
|
RHS.getNode()->getOpcode() == ISD::CopyFromReg ||
|
|
RHS.getNode()->getOpcode() == ISD::TRUNCATE ||
|
|
RHS.getNode()->getOpcode() == ISD::ANY_EXTEND ||
|
|
(RHS.getNode()->getOpcode() == ISD::ZERO_EXTEND &&
|
|
RHS.getNode()->getOperand(0).getValueType() == MVT::i32))
|
|
++Cost;
|
|
// If the base is a register with multiple uses, this
|
|
// transformation may save a mov.
|
|
if ((AM.BaseType == X86ISelAddressMode::RegBase &&
|
|
AM.Base.Reg.getNode() &&
|
|
!AM.Base.Reg.getNode()->hasOneUse()) ||
|
|
AM.BaseType == X86ISelAddressMode::FrameIndexBase)
|
|
--Cost;
|
|
// If the folded LHS was interesting, this transformation saves
|
|
// address arithmetic.
|
|
if ((AM.hasSymbolicDisplacement() && !Backup.hasSymbolicDisplacement()) +
|
|
((AM.Disp != 0) && (Backup.Disp == 0)) +
|
|
(AM.Segment.getNode() && !Backup.Segment.getNode()) >= 2)
|
|
--Cost;
|
|
// If it doesn't look like it may be an overall win, don't do it.
|
|
if (Cost >= 0) {
|
|
AM = Backup;
|
|
break;
|
|
}
|
|
|
|
// Ok, the transformation is legal and appears profitable. Go for it.
|
|
SDValue Zero = CurDAG->getConstant(0, N.getValueType());
|
|
SDValue Neg = CurDAG->getNode(ISD::SUB, dl, N.getValueType(), Zero, RHS);
|
|
AM.IndexReg = Neg;
|
|
AM.Scale = 1;
|
|
|
|
// Insert the new nodes into the topological ordering.
|
|
if (Zero.getNode()->getNodeId() == -1 ||
|
|
Zero.getNode()->getNodeId() > N.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(N.getNode(), Zero.getNode());
|
|
Zero.getNode()->setNodeId(N.getNode()->getNodeId());
|
|
}
|
|
if (Neg.getNode()->getNodeId() == -1 ||
|
|
Neg.getNode()->getNodeId() > N.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(N.getNode(), Neg.getNode());
|
|
Neg.getNode()->setNodeId(N.getNode()->getNodeId());
|
|
}
|
|
return false;
|
|
}
|
|
|
|
case ISD::ADD: {
|
|
X86ISelAddressMode Backup = AM;
|
|
if (!MatchAddressRecursively(N.getNode()->getOperand(0), AM, Depth+1) &&
|
|
!MatchAddressRecursively(N.getNode()->getOperand(1), AM, Depth+1))
|
|
return false;
|
|
AM = Backup;
|
|
if (!MatchAddressRecursively(N.getNode()->getOperand(1), AM, Depth+1) &&
|
|
!MatchAddressRecursively(N.getNode()->getOperand(0), AM, Depth+1))
|
|
return false;
|
|
AM = Backup;
|
|
|
|
// If we couldn't fold both operands into the address at the same time,
|
|
// see if we can just put each operand into a register and fold at least
|
|
// the add.
|
|
if (AM.BaseType == X86ISelAddressMode::RegBase &&
|
|
!AM.Base.Reg.getNode() &&
|
|
!AM.IndexReg.getNode()) {
|
|
AM.Base.Reg = N.getNode()->getOperand(0);
|
|
AM.IndexReg = N.getNode()->getOperand(1);
|
|
AM.Scale = 1;
|
|
return false;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case ISD::OR:
|
|
// Handle "X | C" as "X + C" iff X is known to have C bits clear.
|
|
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
|
|
X86ISelAddressMode Backup = AM;
|
|
uint64_t Offset = CN->getSExtValue();
|
|
// Start with the LHS as an addr mode.
|
|
if (!MatchAddressRecursively(N.getOperand(0), AM, Depth+1) &&
|
|
// Address could not have picked a GV address for the displacement.
|
|
AM.GV == NULL &&
|
|
// On x86-64, the resultant disp must fit in 32-bits.
|
|
(!is64Bit ||
|
|
X86::isOffsetSuitableForCodeModel(AM.Disp + Offset, M,
|
|
AM.hasSymbolicDisplacement())) &&
|
|
// Check to see if the LHS & C is zero.
|
|
CurDAG->MaskedValueIsZero(N.getOperand(0), CN->getAPIntValue())) {
|
|
AM.Disp += Offset;
|
|
return false;
|
|
}
|
|
AM = Backup;
|
|
}
|
|
break;
|
|
|
|
case ISD::AND: {
|
|
// Perform some heroic transforms on an and of a constant-count shift
|
|
// with a constant to enable use of the scaled offset field.
|
|
|
|
SDValue Shift = N.getOperand(0);
|
|
if (Shift.getNumOperands() != 2) break;
|
|
|
|
// Scale must not be used already.
|
|
if (AM.IndexReg.getNode() != 0 || AM.Scale != 1) break;
|
|
|
|
SDValue X = Shift.getOperand(0);
|
|
ConstantSDNode *C2 = dyn_cast<ConstantSDNode>(N.getOperand(1));
|
|
ConstantSDNode *C1 = dyn_cast<ConstantSDNode>(Shift.getOperand(1));
|
|
if (!C1 || !C2) break;
|
|
|
|
// Handle "(X >> (8-C1)) & C2" as "(X >> 8) & 0xff)" if safe. This
|
|
// allows us to convert the shift and and into an h-register extract and
|
|
// a scaled index.
|
|
if (Shift.getOpcode() == ISD::SRL && Shift.hasOneUse()) {
|
|
unsigned ScaleLog = 8 - C1->getZExtValue();
|
|
if (ScaleLog > 0 && ScaleLog < 4 &&
|
|
C2->getZExtValue() == (UINT64_C(0xff) << ScaleLog)) {
|
|
SDValue Eight = CurDAG->getConstant(8, MVT::i8);
|
|
SDValue Mask = CurDAG->getConstant(0xff, N.getValueType());
|
|
SDValue Srl = CurDAG->getNode(ISD::SRL, dl, N.getValueType(),
|
|
X, Eight);
|
|
SDValue And = CurDAG->getNode(ISD::AND, dl, N.getValueType(),
|
|
Srl, Mask);
|
|
SDValue ShlCount = CurDAG->getConstant(ScaleLog, MVT::i8);
|
|
SDValue Shl = CurDAG->getNode(ISD::SHL, dl, N.getValueType(),
|
|
And, ShlCount);
|
|
|
|
// Insert the new nodes into the topological ordering.
|
|
if (Eight.getNode()->getNodeId() == -1 ||
|
|
Eight.getNode()->getNodeId() > X.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(X.getNode(), Eight.getNode());
|
|
Eight.getNode()->setNodeId(X.getNode()->getNodeId());
|
|
}
|
|
if (Mask.getNode()->getNodeId() == -1 ||
|
|
Mask.getNode()->getNodeId() > X.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(X.getNode(), Mask.getNode());
|
|
Mask.getNode()->setNodeId(X.getNode()->getNodeId());
|
|
}
|
|
if (Srl.getNode()->getNodeId() == -1 ||
|
|
Srl.getNode()->getNodeId() > Shift.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(Shift.getNode(), Srl.getNode());
|
|
Srl.getNode()->setNodeId(Shift.getNode()->getNodeId());
|
|
}
|
|
if (And.getNode()->getNodeId() == -1 ||
|
|
And.getNode()->getNodeId() > N.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(N.getNode(), And.getNode());
|
|
And.getNode()->setNodeId(N.getNode()->getNodeId());
|
|
}
|
|
if (ShlCount.getNode()->getNodeId() == -1 ||
|
|
ShlCount.getNode()->getNodeId() > X.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(X.getNode(), ShlCount.getNode());
|
|
ShlCount.getNode()->setNodeId(N.getNode()->getNodeId());
|
|
}
|
|
if (Shl.getNode()->getNodeId() == -1 ||
|
|
Shl.getNode()->getNodeId() > N.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(N.getNode(), Shl.getNode());
|
|
Shl.getNode()->setNodeId(N.getNode()->getNodeId());
|
|
}
|
|
CurDAG->ReplaceAllUsesWith(N, Shl);
|
|
AM.IndexReg = And;
|
|
AM.Scale = (1 << ScaleLog);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Handle "(X << C1) & C2" as "(X & (C2>>C1)) << C1" if safe and if this
|
|
// allows us to fold the shift into this addressing mode.
|
|
if (Shift.getOpcode() != ISD::SHL) break;
|
|
|
|
// Not likely to be profitable if either the AND or SHIFT node has more
|
|
// than one use (unless all uses are for address computation). Besides,
|
|
// isel mechanism requires their node ids to be reused.
|
|
if (!N.hasOneUse() || !Shift.hasOneUse())
|
|
break;
|
|
|
|
// Verify that the shift amount is something we can fold.
|
|
unsigned ShiftCst = C1->getZExtValue();
|
|
if (ShiftCst != 1 && ShiftCst != 2 && ShiftCst != 3)
|
|
break;
|
|
|
|
// Get the new AND mask, this folds to a constant.
|
|
SDValue NewANDMask = CurDAG->getNode(ISD::SRL, dl, N.getValueType(),
|
|
SDValue(C2, 0), SDValue(C1, 0));
|
|
SDValue NewAND = CurDAG->getNode(ISD::AND, dl, N.getValueType(), X,
|
|
NewANDMask);
|
|
SDValue NewSHIFT = CurDAG->getNode(ISD::SHL, dl, N.getValueType(),
|
|
NewAND, SDValue(C1, 0));
|
|
|
|
// Insert the new nodes into the topological ordering.
|
|
if (C1->getNodeId() > X.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(X.getNode(), C1);
|
|
C1->setNodeId(X.getNode()->getNodeId());
|
|
}
|
|
if (NewANDMask.getNode()->getNodeId() == -1 ||
|
|
NewANDMask.getNode()->getNodeId() > X.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(X.getNode(), NewANDMask.getNode());
|
|
NewANDMask.getNode()->setNodeId(X.getNode()->getNodeId());
|
|
}
|
|
if (NewAND.getNode()->getNodeId() == -1 ||
|
|
NewAND.getNode()->getNodeId() > Shift.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(Shift.getNode(), NewAND.getNode());
|
|
NewAND.getNode()->setNodeId(Shift.getNode()->getNodeId());
|
|
}
|
|
if (NewSHIFT.getNode()->getNodeId() == -1 ||
|
|
NewSHIFT.getNode()->getNodeId() > N.getNode()->getNodeId()) {
|
|
CurDAG->RepositionNode(N.getNode(), NewSHIFT.getNode());
|
|
NewSHIFT.getNode()->setNodeId(N.getNode()->getNodeId());
|
|
}
|
|
|
|
CurDAG->ReplaceAllUsesWith(N, NewSHIFT);
|
|
|
|
AM.Scale = 1 << ShiftCst;
|
|
AM.IndexReg = NewAND;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return MatchAddressBase(N, AM);
|
|
}
|
|
|
|
/// MatchAddressBase - Helper for MatchAddress. Add the specified node to the
|
|
/// specified addressing mode without any further recursion.
|
|
bool X86DAGToDAGISel::MatchAddressBase(SDValue N, X86ISelAddressMode &AM) {
|
|
// Is the base register already occupied?
|
|
if (AM.BaseType != X86ISelAddressMode::RegBase || AM.Base.Reg.getNode()) {
|
|
// If so, check to see if the scale index register is set.
|
|
if (AM.IndexReg.getNode() == 0) {
|
|
AM.IndexReg = N;
|
|
AM.Scale = 1;
|
|
return false;
|
|
}
|
|
|
|
// Otherwise, we cannot select it.
|
|
return true;
|
|
}
|
|
|
|
// Default, generate it as a register.
|
|
AM.BaseType = X86ISelAddressMode::RegBase;
|
|
AM.Base.Reg = N;
|
|
return false;
|
|
}
|
|
|
|
/// SelectAddr - returns true if it is able pattern match an addressing mode.
|
|
/// It returns the operands which make up the maximal addressing mode it can
|
|
/// match by reference.
|
|
bool X86DAGToDAGISel::SelectAddr(SDNode *Op, SDValue N, SDValue &Base,
|
|
SDValue &Scale, SDValue &Index,
|
|
SDValue &Disp, SDValue &Segment) {
|
|
X86ISelAddressMode AM;
|
|
if (MatchAddress(N, AM))
|
|
return false;
|
|
|
|
EVT VT = N.getValueType();
|
|
if (AM.BaseType == X86ISelAddressMode::RegBase) {
|
|
if (!AM.Base.Reg.getNode())
|
|
AM.Base.Reg = CurDAG->getRegister(0, VT);
|
|
}
|
|
|
|
if (!AM.IndexReg.getNode())
|
|
AM.IndexReg = CurDAG->getRegister(0, VT);
|
|
|
|
getAddressOperands(AM, Base, Scale, Index, Disp, Segment);
|
|
return true;
|
|
}
|
|
|
|
/// SelectScalarSSELoad - Match a scalar SSE load. In particular, we want to
|
|
/// match a load whose top elements are either undef or zeros. The load flavor
|
|
/// is derived from the type of N, which is either v4f32 or v2f64.
|
|
///
|
|
/// We also return:
|
|
/// PatternChainNode: this is the matched node that has a chain input and
|
|
/// output.
|
|
bool X86DAGToDAGISel::SelectScalarSSELoad(SDNode *Root,
|
|
SDValue N, SDValue &Base,
|
|
SDValue &Scale, SDValue &Index,
|
|
SDValue &Disp, SDValue &Segment,
|
|
SDValue &PatternNodeWithChain) {
|
|
if (N.getOpcode() == ISD::SCALAR_TO_VECTOR) {
|
|
PatternNodeWithChain = N.getOperand(0);
|
|
if (ISD::isNON_EXTLoad(PatternNodeWithChain.getNode()) &&
|
|
PatternNodeWithChain.hasOneUse() &&
|
|
IsProfitableToFold(N.getOperand(0), N.getNode(), Root) &&
|
|
IsLegalToFold(N.getOperand(0), N.getNode(), Root)) {
|
|
LoadSDNode *LD = cast<LoadSDNode>(PatternNodeWithChain);
|
|
if (!SelectAddr(Root, LD->getBasePtr(), Base, Scale, Index, Disp,Segment))
|
|
return false;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Also handle the case where we explicitly require zeros in the top
|
|
// elements. This is a vector shuffle from the zero vector.
|
|
if (N.getOpcode() == X86ISD::VZEXT_MOVL && N.getNode()->hasOneUse() &&
|
|
// Check to see if the top elements are all zeros (or bitcast of zeros).
|
|
N.getOperand(0).getOpcode() == ISD::SCALAR_TO_VECTOR &&
|
|
N.getOperand(0).getNode()->hasOneUse() &&
|
|
ISD::isNON_EXTLoad(N.getOperand(0).getOperand(0).getNode()) &&
|
|
N.getOperand(0).getOperand(0).hasOneUse() &&
|
|
IsProfitableToFold(N.getOperand(0), N.getNode(), Root) &&
|
|
IsLegalToFold(N.getOperand(0), N.getNode(), Root)) {
|
|
// Okay, this is a zero extending load. Fold it.
|
|
LoadSDNode *LD = cast<LoadSDNode>(N.getOperand(0).getOperand(0));
|
|
if (!SelectAddr(Root, LD->getBasePtr(), Base, Scale, Index, Disp, Segment))
|
|
return false;
|
|
PatternNodeWithChain = SDValue(LD, 0);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
/// SelectLEAAddr - it calls SelectAddr and determines if the maximal addressing
|
|
/// mode it matches can be cost effectively emitted as an LEA instruction.
|
|
bool X86DAGToDAGISel::SelectLEAAddr(SDNode *Op, SDValue N,
|
|
SDValue &Base, SDValue &Scale,
|
|
SDValue &Index, SDValue &Disp) {
|
|
X86ISelAddressMode AM;
|
|
|
|
// Set AM.Segment to prevent MatchAddress from using one. LEA doesn't support
|
|
// segments.
|
|
SDValue Copy = AM.Segment;
|
|
SDValue T = CurDAG->getRegister(0, MVT::i32);
|
|
AM.Segment = T;
|
|
if (MatchAddress(N, AM))
|
|
return false;
|
|
assert (T == AM.Segment);
|
|
AM.Segment = Copy;
|
|
|
|
EVT VT = N.getValueType();
|
|
unsigned Complexity = 0;
|
|
if (AM.BaseType == X86ISelAddressMode::RegBase)
|
|
if (AM.Base.Reg.getNode())
|
|
Complexity = 1;
|
|
else
|
|
AM.Base.Reg = CurDAG->getRegister(0, VT);
|
|
else if (AM.BaseType == X86ISelAddressMode::FrameIndexBase)
|
|
Complexity = 4;
|
|
|
|
if (AM.IndexReg.getNode())
|
|
Complexity++;
|
|
else
|
|
AM.IndexReg = CurDAG->getRegister(0, VT);
|
|
|
|
// Don't match just leal(,%reg,2). It's cheaper to do addl %reg, %reg, or with
|
|
// a simple shift.
|
|
if (AM.Scale > 1)
|
|
Complexity++;
|
|
|
|
// FIXME: We are artificially lowering the criteria to turn ADD %reg, $GA
|
|
// to a LEA. This is determined with some expermentation but is by no means
|
|
// optimal (especially for code size consideration). LEA is nice because of
|
|
// its three-address nature. Tweak the cost function again when we can run
|
|
// convertToThreeAddress() at register allocation time.
|
|
if (AM.hasSymbolicDisplacement()) {
|
|
// For X86-64, we should always use lea to materialize RIP relative
|
|
// addresses.
|
|
if (Subtarget->is64Bit())
|
|
Complexity = 4;
|
|
else
|
|
Complexity += 2;
|
|
}
|
|
|
|
if (AM.Disp && (AM.Base.Reg.getNode() || AM.IndexReg.getNode()))
|
|
Complexity++;
|
|
|
|
// If it isn't worth using an LEA, reject it.
|
|
if (Complexity <= 2)
|
|
return false;
|
|
|
|
SDValue Segment;
|
|
getAddressOperands(AM, Base, Scale, Index, Disp, Segment);
|
|
return true;
|
|
}
|
|
|
|
/// SelectTLSADDRAddr - This is only run on TargetGlobalTLSAddress nodes.
|
|
bool X86DAGToDAGISel::SelectTLSADDRAddr(SDNode *Op, SDValue N, SDValue &Base,
|
|
SDValue &Scale, SDValue &Index,
|
|
SDValue &Disp) {
|
|
assert(N.getOpcode() == ISD::TargetGlobalTLSAddress);
|
|
const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
|
|
|
|
X86ISelAddressMode AM;
|
|
AM.GV = GA->getGlobal();
|
|
AM.Disp += GA->getOffset();
|
|
AM.Base.Reg = CurDAG->getRegister(0, N.getValueType());
|
|
AM.SymbolFlags = GA->getTargetFlags();
|
|
|
|
if (N.getValueType() == MVT::i32) {
|
|
AM.Scale = 1;
|
|
AM.IndexReg = CurDAG->getRegister(X86::EBX, MVT::i32);
|
|
} else {
|
|
AM.IndexReg = CurDAG->getRegister(0, MVT::i64);
|
|
}
|
|
|
|
SDValue Segment;
|
|
getAddressOperands(AM, Base, Scale, Index, Disp, Segment);
|
|
return true;
|
|
}
|
|
|
|
|
|
bool X86DAGToDAGISel::TryFoldLoad(SDNode *P, SDValue N,
|
|
SDValue &Base, SDValue &Scale,
|
|
SDValue &Index, SDValue &Disp,
|
|
SDValue &Segment) {
|
|
if (!ISD::isNON_EXTLoad(N.getNode()) ||
|
|
!IsProfitableToFold(N, P, P) ||
|
|
!IsLegalToFold(N, P, P))
|
|
return false;
|
|
|
|
return SelectAddr(P, N.getOperand(1), Base, Scale, Index, Disp, Segment);
|
|
}
|
|
|
|
/// getGlobalBaseReg - Return an SDNode that returns the value of
|
|
/// the global base register. Output instructions required to
|
|
/// initialize the global base register, if necessary.
|
|
///
|
|
SDNode *X86DAGToDAGISel::getGlobalBaseReg() {
|
|
unsigned GlobalBaseReg = getInstrInfo()->getGlobalBaseReg(MF);
|
|
return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
|
|
}
|
|
|
|
static SDNode *FindCallStartFromCall(SDNode *Node) {
|
|
if (Node->getOpcode() == ISD::CALLSEQ_START) return Node;
|
|
assert(Node->getOperand(0).getValueType() == MVT::Other &&
|
|
"Node doesn't have a token chain argument!");
|
|
return FindCallStartFromCall(Node->getOperand(0).getNode());
|
|
}
|
|
|
|
SDNode *X86DAGToDAGISel::SelectAtomic64(SDNode *Node, unsigned Opc) {
|
|
SDValue Chain = Node->getOperand(0);
|
|
SDValue In1 = Node->getOperand(1);
|
|
SDValue In2L = Node->getOperand(2);
|
|
SDValue In2H = Node->getOperand(3);
|
|
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4;
|
|
if (!SelectAddr(In1.getNode(), In1, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4))
|
|
return NULL;
|
|
MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
|
|
MemOp[0] = cast<MemSDNode>(Node)->getMemOperand();
|
|
const SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, In2L, In2H, Chain};
|
|
SDNode *ResNode = CurDAG->getMachineNode(Opc, Node->getDebugLoc(),
|
|
MVT::i32, MVT::i32, MVT::Other, Ops,
|
|
array_lengthof(Ops));
|
|
cast<MachineSDNode>(ResNode)->setMemRefs(MemOp, MemOp + 1);
|
|
return ResNode;
|
|
}
|
|
|
|
SDNode *X86DAGToDAGISel::SelectAtomicLoadAdd(SDNode *Node, EVT NVT) {
|
|
if (Node->hasAnyUseOfValue(0))
|
|
return 0;
|
|
|
|
// Optimize common patterns for __sync_add_and_fetch and
|
|
// __sync_sub_and_fetch where the result is not used. This allows us
|
|
// to use "lock" version of add, sub, inc, dec instructions.
|
|
// FIXME: Do not use special instructions but instead add the "lock"
|
|
// prefix to the target node somehow. The extra information will then be
|
|
// transferred to machine instruction and it denotes the prefix.
|
|
SDValue Chain = Node->getOperand(0);
|
|
SDValue Ptr = Node->getOperand(1);
|
|
SDValue Val = Node->getOperand(2);
|
|
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4;
|
|
if (!SelectAddr(Ptr.getNode(), Ptr, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4))
|
|
return 0;
|
|
|
|
bool isInc = false, isDec = false, isSub = false, isCN = false;
|
|
ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Val);
|
|
if (CN) {
|
|
isCN = true;
|
|
int64_t CNVal = CN->getSExtValue();
|
|
if (CNVal == 1)
|
|
isInc = true;
|
|
else if (CNVal == -1)
|
|
isDec = true;
|
|
else if (CNVal >= 0)
|
|
Val = CurDAG->getTargetConstant(CNVal, NVT);
|
|
else {
|
|
isSub = true;
|
|
Val = CurDAG->getTargetConstant(-CNVal, NVT);
|
|
}
|
|
} else if (Val.hasOneUse() &&
|
|
Val.getOpcode() == ISD::SUB &&
|
|
X86::isZeroNode(Val.getOperand(0))) {
|
|
isSub = true;
|
|
Val = Val.getOperand(1);
|
|
}
|
|
|
|
unsigned Opc = 0;
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: return 0;
|
|
case MVT::i8:
|
|
if (isInc)
|
|
Opc = X86::LOCK_INC8m;
|
|
else if (isDec)
|
|
Opc = X86::LOCK_DEC8m;
|
|
else if (isSub) {
|
|
if (isCN)
|
|
Opc = X86::LOCK_SUB8mi;
|
|
else
|
|
Opc = X86::LOCK_SUB8mr;
|
|
} else {
|
|
if (isCN)
|
|
Opc = X86::LOCK_ADD8mi;
|
|
else
|
|
Opc = X86::LOCK_ADD8mr;
|
|
}
|
|
break;
|
|
case MVT::i16:
|
|
if (isInc)
|
|
Opc = X86::LOCK_INC16m;
|
|
else if (isDec)
|
|
Opc = X86::LOCK_DEC16m;
|
|
else if (isSub) {
|
|
if (isCN) {
|
|
if (Predicate_immSext8(Val.getNode()))
|
|
Opc = X86::LOCK_SUB16mi8;
|
|
else
|
|
Opc = X86::LOCK_SUB16mi;
|
|
} else
|
|
Opc = X86::LOCK_SUB16mr;
|
|
} else {
|
|
if (isCN) {
|
|
if (Predicate_immSext8(Val.getNode()))
|
|
Opc = X86::LOCK_ADD16mi8;
|
|
else
|
|
Opc = X86::LOCK_ADD16mi;
|
|
} else
|
|
Opc = X86::LOCK_ADD16mr;
|
|
}
|
|
break;
|
|
case MVT::i32:
|
|
if (isInc)
|
|
Opc = X86::LOCK_INC32m;
|
|
else if (isDec)
|
|
Opc = X86::LOCK_DEC32m;
|
|
else if (isSub) {
|
|
if (isCN) {
|
|
if (Predicate_immSext8(Val.getNode()))
|
|
Opc = X86::LOCK_SUB32mi8;
|
|
else
|
|
Opc = X86::LOCK_SUB32mi;
|
|
} else
|
|
Opc = X86::LOCK_SUB32mr;
|
|
} else {
|
|
if (isCN) {
|
|
if (Predicate_immSext8(Val.getNode()))
|
|
Opc = X86::LOCK_ADD32mi8;
|
|
else
|
|
Opc = X86::LOCK_ADD32mi;
|
|
} else
|
|
Opc = X86::LOCK_ADD32mr;
|
|
}
|
|
break;
|
|
case MVT::i64:
|
|
if (isInc)
|
|
Opc = X86::LOCK_INC64m;
|
|
else if (isDec)
|
|
Opc = X86::LOCK_DEC64m;
|
|
else if (isSub) {
|
|
Opc = X86::LOCK_SUB64mr;
|
|
if (isCN) {
|
|
if (Predicate_immSext8(Val.getNode()))
|
|
Opc = X86::LOCK_SUB64mi8;
|
|
else if (Predicate_i64immSExt32(Val.getNode()))
|
|
Opc = X86::LOCK_SUB64mi32;
|
|
}
|
|
} else {
|
|
Opc = X86::LOCK_ADD64mr;
|
|
if (isCN) {
|
|
if (Predicate_immSext8(Val.getNode()))
|
|
Opc = X86::LOCK_ADD64mi8;
|
|
else if (Predicate_i64immSExt32(Val.getNode()))
|
|
Opc = X86::LOCK_ADD64mi32;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
DebugLoc dl = Node->getDebugLoc();
|
|
SDValue Undef = SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,
|
|
dl, NVT), 0);
|
|
MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
|
|
MemOp[0] = cast<MemSDNode>(Node)->getMemOperand();
|
|
if (isInc || isDec) {
|
|
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, Chain };
|
|
SDValue Ret = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Other, Ops, 6), 0);
|
|
cast<MachineSDNode>(Ret)->setMemRefs(MemOp, MemOp + 1);
|
|
SDValue RetVals[] = { Undef, Ret };
|
|
return CurDAG->getMergeValues(RetVals, 2, dl).getNode();
|
|
} else {
|
|
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, Val, Chain };
|
|
SDValue Ret = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Other, Ops, 7), 0);
|
|
cast<MachineSDNode>(Ret)->setMemRefs(MemOp, MemOp + 1);
|
|
SDValue RetVals[] = { Undef, Ret };
|
|
return CurDAG->getMergeValues(RetVals, 2, dl).getNode();
|
|
}
|
|
}
|
|
|
|
/// HasNoSignedComparisonUses - Test whether the given X86ISD::CMP node has
|
|
/// any uses which require the SF or OF bits to be accurate.
|
|
static bool HasNoSignedComparisonUses(SDNode *N) {
|
|
// Examine each user of the node.
|
|
for (SDNode::use_iterator UI = N->use_begin(),
|
|
UE = N->use_end(); UI != UE; ++UI) {
|
|
// Only examine CopyToReg uses.
|
|
if (UI->getOpcode() != ISD::CopyToReg)
|
|
return false;
|
|
// Only examine CopyToReg uses that copy to EFLAGS.
|
|
if (cast<RegisterSDNode>(UI->getOperand(1))->getReg() !=
|
|
X86::EFLAGS)
|
|
return false;
|
|
// Examine each user of the CopyToReg use.
|
|
for (SDNode::use_iterator FlagUI = UI->use_begin(),
|
|
FlagUE = UI->use_end(); FlagUI != FlagUE; ++FlagUI) {
|
|
// Only examine the Flag result.
|
|
if (FlagUI.getUse().getResNo() != 1) continue;
|
|
// Anything unusual: assume conservatively.
|
|
if (!FlagUI->isMachineOpcode()) return false;
|
|
// Examine the opcode of the user.
|
|
switch (FlagUI->getMachineOpcode()) {
|
|
// These comparisons don't treat the most significant bit specially.
|
|
case X86::SETAr: case X86::SETAEr: case X86::SETBr: case X86::SETBEr:
|
|
case X86::SETEr: case X86::SETNEr: case X86::SETPr: case X86::SETNPr:
|
|
case X86::SETAm: case X86::SETAEm: case X86::SETBm: case X86::SETBEm:
|
|
case X86::SETEm: case X86::SETNEm: case X86::SETPm: case X86::SETNPm:
|
|
case X86::JA_4: case X86::JAE_4: case X86::JB_4: case X86::JBE_4:
|
|
case X86::JE_4: case X86::JNE_4: case X86::JP_4: case X86::JNP_4:
|
|
case X86::CMOVA16rr: case X86::CMOVA16rm:
|
|
case X86::CMOVA32rr: case X86::CMOVA32rm:
|
|
case X86::CMOVA64rr: case X86::CMOVA64rm:
|
|
case X86::CMOVAE16rr: case X86::CMOVAE16rm:
|
|
case X86::CMOVAE32rr: case X86::CMOVAE32rm:
|
|
case X86::CMOVAE64rr: case X86::CMOVAE64rm:
|
|
case X86::CMOVB16rr: case X86::CMOVB16rm:
|
|
case X86::CMOVB32rr: case X86::CMOVB32rm:
|
|
case X86::CMOVB64rr: case X86::CMOVB64rm:
|
|
case X86::CMOVBE16rr: case X86::CMOVBE16rm:
|
|
case X86::CMOVBE32rr: case X86::CMOVBE32rm:
|
|
case X86::CMOVBE64rr: case X86::CMOVBE64rm:
|
|
case X86::CMOVE16rr: case X86::CMOVE16rm:
|
|
case X86::CMOVE32rr: case X86::CMOVE32rm:
|
|
case X86::CMOVE64rr: case X86::CMOVE64rm:
|
|
case X86::CMOVNE16rr: case X86::CMOVNE16rm:
|
|
case X86::CMOVNE32rr: case X86::CMOVNE32rm:
|
|
case X86::CMOVNE64rr: case X86::CMOVNE64rm:
|
|
case X86::CMOVNP16rr: case X86::CMOVNP16rm:
|
|
case X86::CMOVNP32rr: case X86::CMOVNP32rm:
|
|
case X86::CMOVNP64rr: case X86::CMOVNP64rm:
|
|
case X86::CMOVP16rr: case X86::CMOVP16rm:
|
|
case X86::CMOVP32rr: case X86::CMOVP32rm:
|
|
case X86::CMOVP64rr: case X86::CMOVP64rm:
|
|
continue;
|
|
// Anything else: assume conservatively.
|
|
default: return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
|
|
EVT NVT = Node->getValueType(0);
|
|
unsigned Opc, MOpc;
|
|
unsigned Opcode = Node->getOpcode();
|
|
DebugLoc dl = Node->getDebugLoc();
|
|
|
|
DEBUG(dbgs() << "Selecting: "; Node->dump(CurDAG); dbgs() << '\n');
|
|
|
|
if (Node->isMachineOpcode()) {
|
|
DEBUG(dbgs() << "== "; Node->dump(CurDAG); dbgs() << '\n');
|
|
return NULL; // Already selected.
|
|
}
|
|
|
|
switch (Opcode) {
|
|
default: break;
|
|
case X86ISD::GlobalBaseReg:
|
|
return getGlobalBaseReg();
|
|
|
|
case X86ISD::ATOMOR64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMOR6432);
|
|
case X86ISD::ATOMXOR64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMXOR6432);
|
|
case X86ISD::ATOMADD64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMADD6432);
|
|
case X86ISD::ATOMSUB64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMSUB6432);
|
|
case X86ISD::ATOMNAND64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMNAND6432);
|
|
case X86ISD::ATOMAND64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMAND6432);
|
|
case X86ISD::ATOMSWAP64_DAG:
|
|
return SelectAtomic64(Node, X86::ATOMSWAP6432);
|
|
|
|
case ISD::ATOMIC_LOAD_ADD: {
|
|
SDNode *RetVal = SelectAtomicLoadAdd(Node, NVT);
|
|
if (RetVal)
|
|
return RetVal;
|
|
break;
|
|
}
|
|
|
|
case ISD::SMUL_LOHI:
|
|
case ISD::UMUL_LOHI: {
|
|
SDValue N0 = Node->getOperand(0);
|
|
SDValue N1 = Node->getOperand(1);
|
|
|
|
bool isSigned = Opcode == ISD::SMUL_LOHI;
|
|
if (!isSigned) {
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Unsupported VT!");
|
|
case MVT::i8: Opc = X86::MUL8r; MOpc = X86::MUL8m; break;
|
|
case MVT::i16: Opc = X86::MUL16r; MOpc = X86::MUL16m; break;
|
|
case MVT::i32: Opc = X86::MUL32r; MOpc = X86::MUL32m; break;
|
|
case MVT::i64: Opc = X86::MUL64r; MOpc = X86::MUL64m; break;
|
|
}
|
|
} else {
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Unsupported VT!");
|
|
case MVT::i8: Opc = X86::IMUL8r; MOpc = X86::IMUL8m; break;
|
|
case MVT::i16: Opc = X86::IMUL16r; MOpc = X86::IMUL16m; break;
|
|
case MVT::i32: Opc = X86::IMUL32r; MOpc = X86::IMUL32m; break;
|
|
case MVT::i64: Opc = X86::IMUL64r; MOpc = X86::IMUL64m; break;
|
|
}
|
|
}
|
|
|
|
unsigned LoReg, HiReg;
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Unsupported VT!");
|
|
case MVT::i8: LoReg = X86::AL; HiReg = X86::AH; break;
|
|
case MVT::i16: LoReg = X86::AX; HiReg = X86::DX; break;
|
|
case MVT::i32: LoReg = X86::EAX; HiReg = X86::EDX; break;
|
|
case MVT::i64: LoReg = X86::RAX; HiReg = X86::RDX; break;
|
|
}
|
|
|
|
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4;
|
|
bool foldedLoad = TryFoldLoad(Node, N1, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4);
|
|
// Multiply is commmutative.
|
|
if (!foldedLoad) {
|
|
foldedLoad = TryFoldLoad(Node, N0, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4);
|
|
if (foldedLoad)
|
|
std::swap(N0, N1);
|
|
}
|
|
|
|
SDValue InFlag = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, LoReg,
|
|
N0, SDValue()).getValue(1);
|
|
|
|
if (foldedLoad) {
|
|
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, N1.getOperand(0),
|
|
InFlag };
|
|
SDNode *CNode =
|
|
CurDAG->getMachineNode(MOpc, dl, MVT::Other, MVT::Flag, Ops,
|
|
array_lengthof(Ops));
|
|
InFlag = SDValue(CNode, 1);
|
|
// Update the chain.
|
|
ReplaceUses(N1.getValue(1), SDValue(CNode, 0));
|
|
} else {
|
|
InFlag =
|
|
SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Flag, N1, InFlag), 0);
|
|
}
|
|
|
|
// Copy the low half of the result, if it is needed.
|
|
if (!SDValue(Node, 0).use_empty()) {
|
|
SDValue Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
|
|
LoReg, NVT, InFlag);
|
|
InFlag = Result.getValue(2);
|
|
ReplaceUses(SDValue(Node, 0), Result);
|
|
DEBUG(dbgs() << "=> "; Result.getNode()->dump(CurDAG); dbgs() << '\n');
|
|
}
|
|
// Copy the high half of the result, if it is needed.
|
|
if (!SDValue(Node, 1).use_empty()) {
|
|
SDValue Result;
|
|
if (HiReg == X86::AH && Subtarget->is64Bit()) {
|
|
// Prevent use of AH in a REX instruction by referencing AX instead.
|
|
// Shift it down 8 bits.
|
|
Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
|
|
X86::AX, MVT::i16, InFlag);
|
|
InFlag = Result.getValue(2);
|
|
Result = SDValue(CurDAG->getMachineNode(X86::SHR16ri, dl, MVT::i16,
|
|
Result,
|
|
CurDAG->getTargetConstant(8, MVT::i8)), 0);
|
|
// Then truncate it down to i8.
|
|
Result = CurDAG->getTargetExtractSubreg(X86::SUBREG_8BIT, dl,
|
|
MVT::i8, Result);
|
|
} else {
|
|
Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
|
|
HiReg, NVT, InFlag);
|
|
InFlag = Result.getValue(2);
|
|
}
|
|
ReplaceUses(SDValue(Node, 1), Result);
|
|
DEBUG(dbgs() << "=> "; Result.getNode()->dump(CurDAG); dbgs() << '\n');
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
case ISD::SDIVREM:
|
|
case ISD::UDIVREM: {
|
|
SDValue N0 = Node->getOperand(0);
|
|
SDValue N1 = Node->getOperand(1);
|
|
|
|
bool isSigned = Opcode == ISD::SDIVREM;
|
|
if (!isSigned) {
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Unsupported VT!");
|
|
case MVT::i8: Opc = X86::DIV8r; MOpc = X86::DIV8m; break;
|
|
case MVT::i16: Opc = X86::DIV16r; MOpc = X86::DIV16m; break;
|
|
case MVT::i32: Opc = X86::DIV32r; MOpc = X86::DIV32m; break;
|
|
case MVT::i64: Opc = X86::DIV64r; MOpc = X86::DIV64m; break;
|
|
}
|
|
} else {
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Unsupported VT!");
|
|
case MVT::i8: Opc = X86::IDIV8r; MOpc = X86::IDIV8m; break;
|
|
case MVT::i16: Opc = X86::IDIV16r; MOpc = X86::IDIV16m; break;
|
|
case MVT::i32: Opc = X86::IDIV32r; MOpc = X86::IDIV32m; break;
|
|
case MVT::i64: Opc = X86::IDIV64r; MOpc = X86::IDIV64m; break;
|
|
}
|
|
}
|
|
|
|
unsigned LoReg, HiReg, ClrReg;
|
|
unsigned ClrOpcode, SExtOpcode;
|
|
switch (NVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Unsupported VT!");
|
|
case MVT::i8:
|
|
LoReg = X86::AL; ClrReg = HiReg = X86::AH;
|
|
ClrOpcode = 0;
|
|
SExtOpcode = X86::CBW;
|
|
break;
|
|
case MVT::i16:
|
|
LoReg = X86::AX; HiReg = X86::DX;
|
|
ClrOpcode = X86::MOV16r0; ClrReg = X86::DX;
|
|
SExtOpcode = X86::CWD;
|
|
break;
|
|
case MVT::i32:
|
|
LoReg = X86::EAX; ClrReg = HiReg = X86::EDX;
|
|
ClrOpcode = X86::MOV32r0;
|
|
SExtOpcode = X86::CDQ;
|
|
break;
|
|
case MVT::i64:
|
|
LoReg = X86::RAX; ClrReg = HiReg = X86::RDX;
|
|
ClrOpcode = X86::MOV64r0;
|
|
SExtOpcode = X86::CQO;
|
|
break;
|
|
}
|
|
|
|
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4;
|
|
bool foldedLoad = TryFoldLoad(Node, N1, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4);
|
|
bool signBitIsZero = CurDAG->SignBitIsZero(N0);
|
|
|
|
SDValue InFlag;
|
|
if (NVT == MVT::i8 && (!isSigned || signBitIsZero)) {
|
|
// Special case for div8, just use a move with zero extension to AX to
|
|
// clear the upper 8 bits (AH).
|
|
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, Move, Chain;
|
|
if (TryFoldLoad(Node, N0, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4)) {
|
|
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, N0.getOperand(0) };
|
|
Move =
|
|
SDValue(CurDAG->getMachineNode(X86::MOVZX16rm8, dl, MVT::i16,
|
|
MVT::Other, Ops,
|
|
array_lengthof(Ops)), 0);
|
|
Chain = Move.getValue(1);
|
|
ReplaceUses(N0.getValue(1), Chain);
|
|
} else {
|
|
Move =
|
|
SDValue(CurDAG->getMachineNode(X86::MOVZX16rr8, dl, MVT::i16, N0),0);
|
|
Chain = CurDAG->getEntryNode();
|
|
}
|
|
Chain = CurDAG->getCopyToReg(Chain, dl, X86::AX, Move, SDValue());
|
|
InFlag = Chain.getValue(1);
|
|
} else {
|
|
InFlag =
|
|
CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl,
|
|
LoReg, N0, SDValue()).getValue(1);
|
|
if (isSigned && !signBitIsZero) {
|
|
// Sign extend the low part into the high part.
|
|
InFlag =
|
|
SDValue(CurDAG->getMachineNode(SExtOpcode, dl, MVT::Flag, InFlag),0);
|
|
} else {
|
|
// Zero out the high part, effectively zero extending the input.
|
|
SDValue ClrNode =
|
|
SDValue(CurDAG->getMachineNode(ClrOpcode, dl, NVT), 0);
|
|
InFlag = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, ClrReg,
|
|
ClrNode, InFlag).getValue(1);
|
|
}
|
|
}
|
|
|
|
if (foldedLoad) {
|
|
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, N1.getOperand(0),
|
|
InFlag };
|
|
SDNode *CNode =
|
|
CurDAG->getMachineNode(MOpc, dl, MVT::Other, MVT::Flag, Ops,
|
|
array_lengthof(Ops));
|
|
InFlag = SDValue(CNode, 1);
|
|
// Update the chain.
|
|
ReplaceUses(N1.getValue(1), SDValue(CNode, 0));
|
|
} else {
|
|
InFlag =
|
|
SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Flag, N1, InFlag), 0);
|
|
}
|
|
|
|
// Copy the division (low) result, if it is needed.
|
|
if (!SDValue(Node, 0).use_empty()) {
|
|
SDValue Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
|
|
LoReg, NVT, InFlag);
|
|
InFlag = Result.getValue(2);
|
|
ReplaceUses(SDValue(Node, 0), Result);
|
|
DEBUG(dbgs() << "=> "; Result.getNode()->dump(CurDAG); dbgs() << '\n');
|
|
}
|
|
// Copy the remainder (high) result, if it is needed.
|
|
if (!SDValue(Node, 1).use_empty()) {
|
|
SDValue Result;
|
|
if (HiReg == X86::AH && Subtarget->is64Bit()) {
|
|
// Prevent use of AH in a REX instruction by referencing AX instead.
|
|
// Shift it down 8 bits.
|
|
Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
|
|
X86::AX, MVT::i16, InFlag);
|
|
InFlag = Result.getValue(2);
|
|
Result = SDValue(CurDAG->getMachineNode(X86::SHR16ri, dl, MVT::i16,
|
|
Result,
|
|
CurDAG->getTargetConstant(8, MVT::i8)),
|
|
0);
|
|
// Then truncate it down to i8.
|
|
Result = CurDAG->getTargetExtractSubreg(X86::SUBREG_8BIT, dl,
|
|
MVT::i8, Result);
|
|
} else {
|
|
Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
|
|
HiReg, NVT, InFlag);
|
|
InFlag = Result.getValue(2);
|
|
}
|
|
ReplaceUses(SDValue(Node, 1), Result);
|
|
DEBUG(dbgs() << "=> "; Result.getNode()->dump(CurDAG); dbgs() << '\n');
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
case X86ISD::CMP: {
|
|
SDValue N0 = Node->getOperand(0);
|
|
SDValue N1 = Node->getOperand(1);
|
|
|
|
// Look for (X86cmp (and $op, $imm), 0) and see if we can convert it to
|
|
// use a smaller encoding.
|
|
if (N0.getNode()->getOpcode() == ISD::AND && N0.getNode()->hasOneUse() &&
|
|
N0.getValueType() != MVT::i8 &&
|
|
X86::isZeroNode(N1)) {
|
|
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0.getNode()->getOperand(1));
|
|
if (!C) break;
|
|
|
|
// For example, convert "testl %eax, $8" to "testb %al, $8"
|
|
if ((C->getZExtValue() & ~UINT64_C(0xff)) == 0 &&
|
|
(!(C->getZExtValue() & 0x80) ||
|
|
HasNoSignedComparisonUses(Node))) {
|
|
SDValue Imm = CurDAG->getTargetConstant(C->getZExtValue(), MVT::i8);
|
|
SDValue Reg = N0.getNode()->getOperand(0);
|
|
|
|
// On x86-32, only the ABCD registers have 8-bit subregisters.
|
|
if (!Subtarget->is64Bit()) {
|
|
TargetRegisterClass *TRC = 0;
|
|
switch (N0.getValueType().getSimpleVT().SimpleTy) {
|
|
case MVT::i32: TRC = &X86::GR32_ABCDRegClass; break;
|
|
case MVT::i16: TRC = &X86::GR16_ABCDRegClass; break;
|
|
default: llvm_unreachable("Unsupported TEST operand type!");
|
|
}
|
|
SDValue RC = CurDAG->getTargetConstant(TRC->getID(), MVT::i32);
|
|
Reg = SDValue(CurDAG->getMachineNode(X86::COPY_TO_REGCLASS, dl,
|
|
Reg.getValueType(), Reg, RC), 0);
|
|
}
|
|
|
|
// Extract the l-register.
|
|
SDValue Subreg = CurDAG->getTargetExtractSubreg(X86::SUBREG_8BIT, dl,
|
|
MVT::i8, Reg);
|
|
|
|
// Emit a testb.
|
|
return CurDAG->getMachineNode(X86::TEST8ri, dl, MVT::i32, Subreg, Imm);
|
|
}
|
|
|
|
// For example, "testl %eax, $2048" to "testb %ah, $8".
|
|
if ((C->getZExtValue() & ~UINT64_C(0xff00)) == 0 &&
|
|
(!(C->getZExtValue() & 0x8000) ||
|
|
HasNoSignedComparisonUses(Node))) {
|
|
// Shift the immediate right by 8 bits.
|
|
SDValue ShiftedImm = CurDAG->getTargetConstant(C->getZExtValue() >> 8,
|
|
MVT::i8);
|
|
SDValue Reg = N0.getNode()->getOperand(0);
|
|
|
|
// Put the value in an ABCD register.
|
|
TargetRegisterClass *TRC = 0;
|
|
switch (N0.getValueType().getSimpleVT().SimpleTy) {
|
|
case MVT::i64: TRC = &X86::GR64_ABCDRegClass; break;
|
|
case MVT::i32: TRC = &X86::GR32_ABCDRegClass; break;
|
|
case MVT::i16: TRC = &X86::GR16_ABCDRegClass; break;
|
|
default: llvm_unreachable("Unsupported TEST operand type!");
|
|
}
|
|
SDValue RC = CurDAG->getTargetConstant(TRC->getID(), MVT::i32);
|
|
Reg = SDValue(CurDAG->getMachineNode(X86::COPY_TO_REGCLASS, dl,
|
|
Reg.getValueType(), Reg, RC), 0);
|
|
|
|
// Extract the h-register.
|
|
SDValue Subreg = CurDAG->getTargetExtractSubreg(X86::SUBREG_8BIT_HI, dl,
|
|
MVT::i8, Reg);
|
|
|
|
// Emit a testb. No special NOREX tricks are needed since there's
|
|
// only one GPR operand!
|
|
return CurDAG->getMachineNode(X86::TEST8ri, dl, MVT::i32,
|
|
Subreg, ShiftedImm);
|
|
}
|
|
|
|
// For example, "testl %eax, $32776" to "testw %ax, $32776".
|
|
if ((C->getZExtValue() & ~UINT64_C(0xffff)) == 0 &&
|
|
N0.getValueType() != MVT::i16 &&
|
|
(!(C->getZExtValue() & 0x8000) ||
|
|
HasNoSignedComparisonUses(Node))) {
|
|
SDValue Imm = CurDAG->getTargetConstant(C->getZExtValue(), MVT::i16);
|
|
SDValue Reg = N0.getNode()->getOperand(0);
|
|
|
|
// Extract the 16-bit subregister.
|
|
SDValue Subreg = CurDAG->getTargetExtractSubreg(X86::SUBREG_16BIT, dl,
|
|
MVT::i16, Reg);
|
|
|
|
// Emit a testw.
|
|
return CurDAG->getMachineNode(X86::TEST16ri, dl, MVT::i32, Subreg, Imm);
|
|
}
|
|
|
|
// For example, "testq %rax, $268468232" to "testl %eax, $268468232".
|
|
if ((C->getZExtValue() & ~UINT64_C(0xffffffff)) == 0 &&
|
|
N0.getValueType() == MVT::i64 &&
|
|
(!(C->getZExtValue() & 0x80000000) ||
|
|
HasNoSignedComparisonUses(Node))) {
|
|
SDValue Imm = CurDAG->getTargetConstant(C->getZExtValue(), MVT::i32);
|
|
SDValue Reg = N0.getNode()->getOperand(0);
|
|
|
|
// Extract the 32-bit subregister.
|
|
SDValue Subreg = CurDAG->getTargetExtractSubreg(X86::SUBREG_32BIT, dl,
|
|
MVT::i32, Reg);
|
|
|
|
// Emit a testl.
|
|
return CurDAG->getMachineNode(X86::TEST32ri, dl, MVT::i32, Subreg, Imm);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
SDNode *ResNode = SelectCode(Node);
|
|
|
|
DEBUG(dbgs() << "=> ";
|
|
if (ResNode == NULL || ResNode == Node)
|
|
Node->dump(CurDAG);
|
|
else
|
|
ResNode->dump(CurDAG);
|
|
dbgs() << '\n');
|
|
|
|
return ResNode;
|
|
}
|
|
|
|
bool X86DAGToDAGISel::
|
|
SelectInlineAsmMemoryOperand(const SDValue &Op, char ConstraintCode,
|
|
std::vector<SDValue> &OutOps) {
|
|
SDValue Op0, Op1, Op2, Op3, Op4;
|
|
switch (ConstraintCode) {
|
|
case 'o': // offsetable ??
|
|
case 'v': // not offsetable ??
|
|
default: return true;
|
|
case 'm': // memory
|
|
if (!SelectAddr(Op.getNode(), Op, Op0, Op1, Op2, Op3, Op4))
|
|
return true;
|
|
break;
|
|
}
|
|
|
|
OutOps.push_back(Op0);
|
|
OutOps.push_back(Op1);
|
|
OutOps.push_back(Op2);
|
|
OutOps.push_back(Op3);
|
|
OutOps.push_back(Op4);
|
|
return false;
|
|
}
|
|
|
|
/// createX86ISelDag - This pass converts a legalized DAG into a
|
|
/// X86-specific DAG, ready for instruction scheduling.
|
|
///
|
|
FunctionPass *llvm::createX86ISelDag(X86TargetMachine &TM,
|
|
llvm::CodeGenOpt::Level OptLevel) {
|
|
return new X86DAGToDAGISel(TM, OptLevel);
|
|
}
|