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when storing to an 8-bit memory location), as most don't. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23303 91177308-0d34-0410-b5e6-96231b3b80d8
3282 lines
128 KiB
C++
3282 lines
128 KiB
C++
//===-- LegalizeDAG.cpp - Implement SelectionDAG::Legalize ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the SelectionDAG::Legalize method.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/SelectionDAG.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/Support/MathExtras.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Constants.h"
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#include <iostream>
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#include <set>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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/// SelectionDAGLegalize - This takes an arbitrary SelectionDAG as input and
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/// hacks on it until the target machine can handle it. This involves
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/// eliminating value sizes the machine cannot handle (promoting small sizes to
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/// large sizes or splitting up large values into small values) as well as
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/// eliminating operations the machine cannot handle.
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///
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/// This code also does a small amount of optimization and recognition of idioms
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/// as part of its processing. For example, if a target does not support a
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/// 'setcc' instruction efficiently, but does support 'brcc' instruction, this
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/// will attempt merge setcc and brc instructions into brcc's.
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///
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namespace {
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class SelectionDAGLegalize {
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TargetLowering &TLI;
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SelectionDAG &DAG;
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/// LegalizeAction - This enum indicates what action we should take for each
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/// value type the can occur in the program.
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enum LegalizeAction {
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Legal, // The target natively supports this value type.
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Promote, // This should be promoted to the next larger type.
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Expand, // This integer type should be broken into smaller pieces.
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};
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/// ValueTypeActions - This is a bitvector that contains two bits for each
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/// value type, where the two bits correspond to the LegalizeAction enum.
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/// This can be queried with "getTypeAction(VT)".
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unsigned ValueTypeActions;
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/// NeedsAnotherIteration - This is set when we expand a large integer
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/// operation into smaller integer operations, but the smaller operations are
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/// not set. This occurs only rarely in practice, for targets that don't have
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/// 32-bit or larger integer registers.
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bool NeedsAnotherIteration;
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/// LegalizedNodes - For nodes that are of legal width, and that have more
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/// than one use, this map indicates what regularized operand to use. This
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/// allows us to avoid legalizing the same thing more than once.
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std::map<SDOperand, SDOperand> LegalizedNodes;
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/// PromotedNodes - For nodes that are below legal width, and that have more
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/// than one use, this map indicates what promoted value to use. This allows
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/// us to avoid promoting the same thing more than once.
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std::map<SDOperand, SDOperand> PromotedNodes;
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/// ExpandedNodes - For nodes that need to be expanded, and which have more
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/// than one use, this map indicates which which operands are the expanded
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/// version of the input. This allows us to avoid expanding the same node
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/// more than once.
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std::map<SDOperand, std::pair<SDOperand, SDOperand> > ExpandedNodes;
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void AddLegalizedOperand(SDOperand From, SDOperand To) {
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bool isNew = LegalizedNodes.insert(std::make_pair(From, To)).second;
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assert(isNew && "Got into the map somehow?");
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}
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void AddPromotedOperand(SDOperand From, SDOperand To) {
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bool isNew = PromotedNodes.insert(std::make_pair(From, To)).second;
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assert(isNew && "Got into the map somehow?");
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}
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public:
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SelectionDAGLegalize(SelectionDAG &DAG);
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/// Run - While there is still lowering to do, perform a pass over the DAG.
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/// Most regularization can be done in a single pass, but targets that require
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/// large values to be split into registers multiple times (e.g. i64 -> 4x
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/// i16) require iteration for these values (the first iteration will demote
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/// to i32, the second will demote to i16).
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void Run() {
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do {
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NeedsAnotherIteration = false;
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LegalizeDAG();
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} while (NeedsAnotherIteration);
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}
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/// getTypeAction - Return how we should legalize values of this type, either
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/// it is already legal or we need to expand it into multiple registers of
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/// smaller integer type, or we need to promote it to a larger type.
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LegalizeAction getTypeAction(MVT::ValueType VT) const {
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return (LegalizeAction)((ValueTypeActions >> (2*VT)) & 3);
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}
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/// isTypeLegal - Return true if this type is legal on this target.
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///
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bool isTypeLegal(MVT::ValueType VT) const {
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return getTypeAction(VT) == Legal;
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}
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private:
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void LegalizeDAG();
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SDOperand LegalizeOp(SDOperand O);
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void ExpandOp(SDOperand O, SDOperand &Lo, SDOperand &Hi);
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SDOperand PromoteOp(SDOperand O);
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SDOperand ExpandLibCall(const char *Name, SDNode *Node,
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SDOperand &Hi);
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SDOperand ExpandIntToFP(bool isSigned, MVT::ValueType DestTy,
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SDOperand Source);
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SDOperand ExpandLegalINT_TO_FP(bool isSigned,
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SDOperand LegalOp,
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MVT::ValueType DestVT);
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SDOperand PromoteLegalINT_TO_FP(SDOperand LegalOp, MVT::ValueType DestVT,
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bool isSigned);
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SDOperand PromoteLegalFP_TO_INT(SDOperand LegalOp, MVT::ValueType DestVT,
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bool isSigned);
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bool ExpandShift(unsigned Opc, SDOperand Op, SDOperand Amt,
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SDOperand &Lo, SDOperand &Hi);
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void ExpandShiftParts(unsigned NodeOp, SDOperand Op, SDOperand Amt,
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SDOperand &Lo, SDOperand &Hi);
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void ExpandByParts(unsigned NodeOp, SDOperand LHS, SDOperand RHS,
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SDOperand &Lo, SDOperand &Hi);
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void SpliceCallInto(const SDOperand &CallResult, SDNode *OutChain);
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SDOperand getIntPtrConstant(uint64_t Val) {
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return DAG.getConstant(Val, TLI.getPointerTy());
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}
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};
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}
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SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag)
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: TLI(dag.getTargetLoweringInfo()), DAG(dag),
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ValueTypeActions(TLI.getValueTypeActions()) {
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assert(MVT::LAST_VALUETYPE <= 16 &&
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"Too many value types for ValueTypeActions to hold!");
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}
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/// ExpandLegalINT_TO_FP - This function is responsible for legalizing a
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/// INT_TO_FP operation of the specified operand when the target requests that
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/// we expand it. At this point, we know that the result and operand types are
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/// legal for the target.
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SDOperand SelectionDAGLegalize::ExpandLegalINT_TO_FP(bool isSigned,
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SDOperand Op0,
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MVT::ValueType DestVT) {
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if (Op0.getValueType() == MVT::i32) {
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// simple 32-bit [signed|unsigned] integer to float/double expansion
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// get the stack frame index of a 8 byte buffer
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MachineFunction &MF = DAG.getMachineFunction();
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int SSFI = MF.getFrameInfo()->CreateStackObject(8, 8);
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// get address of 8 byte buffer
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SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
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// word offset constant for Hi/Lo address computation
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SDOperand WordOff = DAG.getConstant(sizeof(int), TLI.getPointerTy());
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// set up Hi and Lo (into buffer) address based on endian
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SDOperand Hi, Lo;
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if (TLI.isLittleEndian()) {
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Hi = DAG.getNode(ISD::ADD, TLI.getPointerTy(), StackSlot, WordOff);
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Lo = StackSlot;
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} else {
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Hi = StackSlot;
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Lo = DAG.getNode(ISD::ADD, TLI.getPointerTy(), StackSlot, WordOff);
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}
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// if signed map to unsigned space
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SDOperand Op0Mapped;
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if (isSigned) {
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// constant used to invert sign bit (signed to unsigned mapping)
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SDOperand SignBit = DAG.getConstant(0x80000000u, MVT::i32);
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Op0Mapped = DAG.getNode(ISD::XOR, MVT::i32, Op0, SignBit);
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} else {
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Op0Mapped = Op0;
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}
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// store the lo of the constructed double - based on integer input
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SDOperand Store1 = DAG.getNode(ISD::STORE, MVT::Other, DAG.getEntryNode(),
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Op0Mapped, Lo, DAG.getSrcValue(NULL));
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// initial hi portion of constructed double
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SDOperand InitialHi = DAG.getConstant(0x43300000u, MVT::i32);
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// store the hi of the constructed double - biased exponent
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SDOperand Store2 = DAG.getNode(ISD::STORE, MVT::Other, Store1,
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InitialHi, Hi, DAG.getSrcValue(NULL));
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// load the constructed double
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SDOperand Load = DAG.getLoad(MVT::f64, Store2, StackSlot,
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DAG.getSrcValue(NULL));
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// FP constant to bias correct the final result
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SDOperand Bias = DAG.getConstantFP(isSigned ?
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BitsToDouble(0x4330000080000000ULL)
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: BitsToDouble(0x4330000000000000ULL),
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MVT::f64);
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// subtract the bias
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SDOperand Sub = DAG.getNode(ISD::SUB, MVT::f64, Load, Bias);
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// final result
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SDOperand Result;
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// handle final rounding
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if (DestVT == MVT::f64) {
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// do nothing
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Result = Sub;
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} else {
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// if f32 then cast to f32
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Result = DAG.getNode(ISD::FP_ROUND, MVT::f32, Sub);
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}
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NeedsAnotherIteration = true;
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return Result;
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}
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assert(!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet");
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SDOperand Tmp1 = DAG.getNode(ISD::SINT_TO_FP, DestVT, Op0);
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SDOperand SignSet = DAG.getSetCC(TLI.getSetCCResultTy(), Op0,
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DAG.getConstant(0, Op0.getValueType()),
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ISD::SETLT);
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SDOperand Zero = getIntPtrConstant(0), Four = getIntPtrConstant(4);
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SDOperand CstOffset = DAG.getNode(ISD::SELECT, Zero.getValueType(),
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SignSet, Four, Zero);
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// If the sign bit of the integer is set, the large number will be treated
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// as a negative number. To counteract this, the dynamic code adds an
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// offset depending on the data type.
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uint64_t FF;
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switch (Op0.getValueType()) {
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default: assert(0 && "Unsupported integer type!");
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case MVT::i8 : FF = 0x43800000ULL; break; // 2^8 (as a float)
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case MVT::i16: FF = 0x47800000ULL; break; // 2^16 (as a float)
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case MVT::i32: FF = 0x4F800000ULL; break; // 2^32 (as a float)
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case MVT::i64: FF = 0x5F800000ULL; break; // 2^64 (as a float)
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}
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if (TLI.isLittleEndian()) FF <<= 32;
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static Constant *FudgeFactor = ConstantUInt::get(Type::ULongTy, FF);
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SDOperand CPIdx = DAG.getConstantPool(FudgeFactor, TLI.getPointerTy());
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CPIdx = DAG.getNode(ISD::ADD, TLI.getPointerTy(), CPIdx, CstOffset);
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SDOperand FudgeInReg;
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if (DestVT == MVT::f32)
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FudgeInReg = DAG.getLoad(MVT::f32, DAG.getEntryNode(), CPIdx,
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DAG.getSrcValue(NULL));
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else {
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assert(DestVT == MVT::f64 && "Unexpected conversion");
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FudgeInReg = LegalizeOp(DAG.getExtLoad(ISD::EXTLOAD, MVT::f64,
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DAG.getEntryNode(), CPIdx,
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DAG.getSrcValue(NULL), MVT::f32));
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}
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NeedsAnotherIteration = true;
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return DAG.getNode(ISD::ADD, DestVT, Tmp1, FudgeInReg);
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}
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/// PromoteLegalINT_TO_FP - This function is responsible for legalizing a
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/// *INT_TO_FP operation of the specified operand when the target requests that
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/// we promote it. At this point, we know that the result and operand types are
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/// legal for the target, and that there is a legal UINT_TO_FP or SINT_TO_FP
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/// operation that takes a larger input.
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SDOperand SelectionDAGLegalize::PromoteLegalINT_TO_FP(SDOperand LegalOp,
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MVT::ValueType DestVT,
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bool isSigned) {
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// First step, figure out the appropriate *INT_TO_FP operation to use.
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MVT::ValueType NewInTy = LegalOp.getValueType();
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unsigned OpToUse = 0;
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// Scan for the appropriate larger type to use.
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while (1) {
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NewInTy = (MVT::ValueType)(NewInTy+1);
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assert(MVT::isInteger(NewInTy) && "Ran out of possibilities!");
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// If the target supports SINT_TO_FP of this type, use it.
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switch (TLI.getOperationAction(ISD::SINT_TO_FP, NewInTy)) {
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default: break;
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case TargetLowering::Legal:
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if (!TLI.isTypeLegal(NewInTy))
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break; // Can't use this datatype.
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// FALL THROUGH.
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case TargetLowering::Custom:
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OpToUse = ISD::SINT_TO_FP;
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break;
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}
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if (OpToUse) break;
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if (isSigned) continue;
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// If the target supports UINT_TO_FP of this type, use it.
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switch (TLI.getOperationAction(ISD::UINT_TO_FP, NewInTy)) {
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default: break;
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case TargetLowering::Legal:
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if (!TLI.isTypeLegal(NewInTy))
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break; // Can't use this datatype.
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// FALL THROUGH.
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case TargetLowering::Custom:
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OpToUse = ISD::UINT_TO_FP;
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break;
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}
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if (OpToUse) break;
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// Otherwise, try a larger type.
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}
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// Make sure to legalize any nodes we create here in the next pass.
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NeedsAnotherIteration = true;
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// Okay, we found the operation and type to use. Zero extend our input to the
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// desired type then run the operation on it.
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return DAG.getNode(OpToUse, DestVT,
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DAG.getNode(isSigned ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND,
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NewInTy, LegalOp));
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}
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/// PromoteLegalFP_TO_INT - This function is responsible for legalizing a
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/// FP_TO_*INT operation of the specified operand when the target requests that
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/// we promote it. At this point, we know that the result and operand types are
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/// legal for the target, and that there is a legal FP_TO_UINT or FP_TO_SINT
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/// operation that returns a larger result.
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SDOperand SelectionDAGLegalize::PromoteLegalFP_TO_INT(SDOperand LegalOp,
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MVT::ValueType DestVT,
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bool isSigned) {
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// First step, figure out the appropriate FP_TO*INT operation to use.
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MVT::ValueType NewOutTy = DestVT;
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unsigned OpToUse = 0;
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// Scan for the appropriate larger type to use.
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while (1) {
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NewOutTy = (MVT::ValueType)(NewOutTy+1);
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assert(MVT::isInteger(NewOutTy) && "Ran out of possibilities!");
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// If the target supports FP_TO_SINT returning this type, use it.
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switch (TLI.getOperationAction(ISD::FP_TO_SINT, NewOutTy)) {
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default: break;
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case TargetLowering::Legal:
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if (!TLI.isTypeLegal(NewOutTy))
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break; // Can't use this datatype.
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// FALL THROUGH.
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case TargetLowering::Custom:
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OpToUse = ISD::FP_TO_SINT;
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break;
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}
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if (OpToUse) break;
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// If the target supports FP_TO_UINT of this type, use it.
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switch (TLI.getOperationAction(ISD::FP_TO_UINT, NewOutTy)) {
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default: break;
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case TargetLowering::Legal:
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if (!TLI.isTypeLegal(NewOutTy))
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break; // Can't use this datatype.
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// FALL THROUGH.
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case TargetLowering::Custom:
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OpToUse = ISD::FP_TO_UINT;
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break;
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}
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if (OpToUse) break;
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// Otherwise, try a larger type.
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}
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// Make sure to legalize any nodes we create here in the next pass.
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NeedsAnotherIteration = true;
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// Okay, we found the operation and type to use. Truncate the result of the
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// extended FP_TO_*INT operation to the desired size.
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return DAG.getNode(ISD::TRUNCATE, DestVT,
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DAG.getNode(OpToUse, NewOutTy, LegalOp));
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}
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void SelectionDAGLegalize::LegalizeDAG() {
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SDOperand OldRoot = DAG.getRoot();
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SDOperand NewRoot = LegalizeOp(OldRoot);
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DAG.setRoot(NewRoot);
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ExpandedNodes.clear();
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LegalizedNodes.clear();
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PromotedNodes.clear();
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// Remove dead nodes now.
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DAG.RemoveDeadNodes(OldRoot.Val);
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}
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SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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assert(isTypeLegal(Op.getValueType()) &&
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"Caller should expand or promote operands that are not legal!");
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SDNode *Node = Op.Val;
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// If this operation defines any values that cannot be represented in a
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// register on this target, make sure to expand or promote them.
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if (Node->getNumValues() > 1) {
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for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
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switch (getTypeAction(Node->getValueType(i))) {
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case Legal: break; // Nothing to do.
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case Expand: {
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SDOperand T1, T2;
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ExpandOp(Op.getValue(i), T1, T2);
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assert(LegalizedNodes.count(Op) &&
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"Expansion didn't add legal operands!");
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return LegalizedNodes[Op];
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}
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case Promote:
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PromoteOp(Op.getValue(i));
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assert(LegalizedNodes.count(Op) &&
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"Expansion didn't add legal operands!");
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return LegalizedNodes[Op];
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}
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}
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// Note that LegalizeOp may be reentered even from single-use nodes, which
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// means that we always must cache transformed nodes.
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std::map<SDOperand, SDOperand>::iterator I = LegalizedNodes.find(Op);
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if (I != LegalizedNodes.end()) return I->second;
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SDOperand Tmp1, Tmp2, Tmp3, Tmp4;
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SDOperand Result = Op;
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switch (Node->getOpcode()) {
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default:
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if (Node->getOpcode() >= ISD::BUILTIN_OP_END) {
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// If this is a target node, legalize it by legalizing the operands then
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// passing it through.
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std::vector<SDOperand> Ops;
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bool Changed = false;
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for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
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Ops.push_back(LegalizeOp(Node->getOperand(i)));
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Changed = Changed || Node->getOperand(i) != Ops.back();
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}
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if (Changed)
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if (Node->getNumValues() == 1)
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Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Ops);
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else {
|
|
std::vector<MVT::ValueType> VTs(Node->value_begin(),
|
|
Node->value_end());
|
|
Result = DAG.getNode(Node->getOpcode(), VTs, Ops);
|
|
}
|
|
|
|
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
|
|
AddLegalizedOperand(Op.getValue(i), Result.getValue(i));
|
|
return Result.getValue(Op.ResNo);
|
|
}
|
|
// Otherwise this is an unhandled builtin node. splat.
|
|
std::cerr << "NODE: "; Node->dump(); std::cerr << "\n";
|
|
assert(0 && "Do not know how to legalize this operator!");
|
|
abort();
|
|
case ISD::EntryToken:
|
|
case ISD::FrameIndex:
|
|
case ISD::GlobalAddress:
|
|
case ISD::ExternalSymbol:
|
|
case ISD::ConstantPool: // Nothing to do.
|
|
assert(isTypeLegal(Node->getValueType(0)) && "This must be legal!");
|
|
break;
|
|
case ISD::AssertSext:
|
|
case ISD::AssertZext:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1,
|
|
Node->getOperand(1));
|
|
break;
|
|
case ISD::CopyFromReg:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getCopyFromReg(Tmp1,
|
|
cast<RegisterSDNode>(Node->getOperand(1))->getReg(),
|
|
Node->getValueType(0));
|
|
else
|
|
Result = Op.getValue(0);
|
|
|
|
// Since CopyFromReg produces two values, make sure to remember that we
|
|
// legalized both of them.
|
|
AddLegalizedOperand(Op.getValue(0), Result);
|
|
AddLegalizedOperand(Op.getValue(1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
case ISD::ImplicitDef:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(ISD::ImplicitDef, MVT::Other,
|
|
Tmp1, Node->getOperand(1));
|
|
break;
|
|
case ISD::UNDEF: {
|
|
MVT::ValueType VT = Op.getValueType();
|
|
switch (TLI.getOperationAction(ISD::UNDEF, VT)) {
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Expand:
|
|
case TargetLowering::Promote:
|
|
if (MVT::isInteger(VT))
|
|
Result = DAG.getConstant(0, VT);
|
|
else if (MVT::isFloatingPoint(VT))
|
|
Result = DAG.getConstantFP(0, VT);
|
|
else
|
|
assert(0 && "Unknown value type!");
|
|
break;
|
|
case TargetLowering::Legal:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
case ISD::Constant:
|
|
// We know we don't need to expand constants here, constants only have one
|
|
// value and we check that it is fine above.
|
|
|
|
// FIXME: Maybe we should handle things like targets that don't support full
|
|
// 32-bit immediates?
|
|
break;
|
|
case ISD::ConstantFP: {
|
|
// Spill FP immediates to the constant pool if the target cannot directly
|
|
// codegen them. Targets often have some immediate values that can be
|
|
// efficiently generated into an FP register without a load. We explicitly
|
|
// leave these constants as ConstantFP nodes for the target to deal with.
|
|
|
|
ConstantFPSDNode *CFP = cast<ConstantFPSDNode>(Node);
|
|
|
|
// Check to see if this FP immediate is already legal.
|
|
bool isLegal = false;
|
|
for (TargetLowering::legal_fpimm_iterator I = TLI.legal_fpimm_begin(),
|
|
E = TLI.legal_fpimm_end(); I != E; ++I)
|
|
if (CFP->isExactlyValue(*I)) {
|
|
isLegal = true;
|
|
break;
|
|
}
|
|
|
|
if (!isLegal) {
|
|
// Otherwise we need to spill the constant to memory.
|
|
bool Extend = false;
|
|
|
|
// If a FP immediate is precise when represented as a float, we put it
|
|
// into the constant pool as a float, even if it's is statically typed
|
|
// as a double.
|
|
MVT::ValueType VT = CFP->getValueType(0);
|
|
bool isDouble = VT == MVT::f64;
|
|
ConstantFP *LLVMC = ConstantFP::get(isDouble ? Type::DoubleTy :
|
|
Type::FloatTy, CFP->getValue());
|
|
if (isDouble && CFP->isExactlyValue((float)CFP->getValue()) &&
|
|
// Only do this if the target has a native EXTLOAD instruction from
|
|
// f32.
|
|
TLI.isOperationLegal(ISD::EXTLOAD, MVT::f32)) {
|
|
LLVMC = cast<ConstantFP>(ConstantExpr::getCast(LLVMC, Type::FloatTy));
|
|
VT = MVT::f32;
|
|
Extend = true;
|
|
}
|
|
|
|
SDOperand CPIdx = DAG.getConstantPool(LLVMC, TLI.getPointerTy());
|
|
if (Extend) {
|
|
Result = DAG.getExtLoad(ISD::EXTLOAD, MVT::f64, DAG.getEntryNode(),
|
|
CPIdx, DAG.getSrcValue(NULL), MVT::f32);
|
|
} else {
|
|
Result = DAG.getLoad(VT, DAG.getEntryNode(), CPIdx,
|
|
DAG.getSrcValue(NULL));
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case ISD::TokenFactor: {
|
|
std::vector<SDOperand> Ops;
|
|
bool Changed = false;
|
|
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
|
|
SDOperand Op = Node->getOperand(i);
|
|
// Fold single-use TokenFactor nodes into this token factor as we go.
|
|
// FIXME: This is something that the DAGCombiner should do!!
|
|
if (Op.getOpcode() == ISD::TokenFactor && Op.hasOneUse()) {
|
|
Changed = true;
|
|
for (unsigned j = 0, e = Op.getNumOperands(); j != e; ++j)
|
|
Ops.push_back(LegalizeOp(Op.getOperand(j)));
|
|
} else {
|
|
Ops.push_back(LegalizeOp(Op)); // Legalize the operands
|
|
Changed |= Ops[i] != Op;
|
|
}
|
|
}
|
|
if (Changed)
|
|
Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Ops);
|
|
break;
|
|
}
|
|
|
|
case ISD::CALLSEQ_START:
|
|
case ISD::CALLSEQ_END:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
// Do not try to legalize the target-specific arguments (#1+)
|
|
Tmp2 = Node->getOperand(0);
|
|
if (Tmp1 != Tmp2) {
|
|
Node->setAdjCallChain(Tmp1);
|
|
|
|
// If moving the operand from pointing to Tmp2 dropped its use count to 1,
|
|
// this will cause the maps used to memoize results to get confused.
|
|
// Create and add a dummy use, just to increase its use count. This will
|
|
// be removed at the end of legalize when dead nodes are removed.
|
|
if (Tmp2.Val->hasOneUse())
|
|
DAG.getNode(ISD::PCMARKER, MVT::Other, Tmp2,
|
|
DAG.getConstant(0, MVT::i32));
|
|
}
|
|
// Note that we do not create new CALLSEQ_DOWN/UP nodes here. These
|
|
// nodes are treated specially and are mutated in place. This makes the dag
|
|
// legalization process more efficient and also makes libcall insertion
|
|
// easier.
|
|
break;
|
|
case ISD::DYNAMIC_STACKALLOC:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the size.
|
|
Tmp3 = LegalizeOp(Node->getOperand(2)); // Legalize the alignment.
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2)) {
|
|
std::vector<MVT::ValueType> VTs(Node->value_begin(), Node->value_end());
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(Tmp1); Ops.push_back(Tmp2); Ops.push_back(Tmp3);
|
|
Result = DAG.getNode(ISD::DYNAMIC_STACKALLOC, VTs, Ops);
|
|
} else
|
|
Result = Op.getValue(0);
|
|
|
|
// Since this op produces two values, make sure to remember that we
|
|
// legalized both of them.
|
|
AddLegalizedOperand(SDOperand(Node, 0), Result);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
|
|
case ISD::TAILCALL:
|
|
case ISD::CALL: {
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the callee.
|
|
|
|
bool Changed = false;
|
|
std::vector<SDOperand> Ops;
|
|
for (unsigned i = 2, e = Node->getNumOperands(); i != e; ++i) {
|
|
Ops.push_back(LegalizeOp(Node->getOperand(i)));
|
|
Changed |= Ops.back() != Node->getOperand(i);
|
|
}
|
|
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) || Changed) {
|
|
std::vector<MVT::ValueType> RetTyVTs;
|
|
RetTyVTs.reserve(Node->getNumValues());
|
|
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
|
|
RetTyVTs.push_back(Node->getValueType(i));
|
|
Result = SDOperand(DAG.getCall(RetTyVTs, Tmp1, Tmp2, Ops,
|
|
Node->getOpcode() == ISD::TAILCALL), 0);
|
|
} else {
|
|
Result = Result.getValue(0);
|
|
}
|
|
// Since calls produce multiple values, make sure to remember that we
|
|
// legalized all of them.
|
|
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
|
|
AddLegalizedOperand(SDOperand(Node, i), Result.getValue(i));
|
|
return Result.getValue(Op.ResNo);
|
|
}
|
|
case ISD::BR:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(ISD::BR, MVT::Other, Tmp1, Node->getOperand(1));
|
|
break;
|
|
|
|
case ISD::BRCOND:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
|
|
switch (getTypeAction(Node->getOperand(1).getValueType())) {
|
|
case Expand: assert(0 && "It's impossible to expand bools");
|
|
case Legal:
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the condition.
|
|
break;
|
|
case Promote:
|
|
Tmp2 = PromoteOp(Node->getOperand(1)); // Promote the condition.
|
|
break;
|
|
}
|
|
|
|
switch (TLI.getOperationAction(ISD::BRCOND, MVT::Other)) {
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Expand:
|
|
// Expand brcond's setcc into its constituent parts and create a BR_CC
|
|
// Node.
|
|
if (Tmp2.getOpcode() == ISD::SETCC) {
|
|
Result = DAG.getNode(ISD::BR_CC, MVT::Other, Tmp1, Tmp2.getOperand(2),
|
|
Tmp2.getOperand(0), Tmp2.getOperand(1),
|
|
Node->getOperand(2));
|
|
} else {
|
|
// Make sure the condition is either zero or one. It may have been
|
|
// promoted from something else.
|
|
Tmp2 = DAG.getZeroExtendInReg(Tmp2, MVT::i1);
|
|
|
|
Result = DAG.getNode(ISD::BR_CC, MVT::Other, Tmp1,
|
|
DAG.getCondCode(ISD::SETNE), Tmp2,
|
|
DAG.getConstant(0, Tmp2.getValueType()),
|
|
Node->getOperand(2));
|
|
}
|
|
break;
|
|
case TargetLowering::Legal:
|
|
// Basic block destination (Op#2) is always legal.
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getNode(ISD::BRCOND, MVT::Other, Tmp1, Tmp2,
|
|
Node->getOperand(2));
|
|
break;
|
|
}
|
|
break;
|
|
case ISD::BR_CC:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
|
|
if (isTypeLegal(Node->getOperand(2).getValueType())) {
|
|
Tmp2 = LegalizeOp(Node->getOperand(2)); // LHS
|
|
Tmp3 = LegalizeOp(Node->getOperand(3)); // RHS
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(2) ||
|
|
Tmp3 != Node->getOperand(3)) {
|
|
Result = DAG.getNode(ISD::BR_CC, MVT::Other, Tmp1, Node->getOperand(1),
|
|
Tmp2, Tmp3, Node->getOperand(4));
|
|
}
|
|
break;
|
|
} else {
|
|
Tmp2 = LegalizeOp(DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(),
|
|
Node->getOperand(2), // LHS
|
|
Node->getOperand(3), // RHS
|
|
Node->getOperand(1)));
|
|
// If we get a SETCC back from legalizing the SETCC node we just
|
|
// created, then use its LHS, RHS, and CC directly in creating a new
|
|
// node. Otherwise, select between the true and false value based on
|
|
// comparing the result of the legalized with zero.
|
|
if (Tmp2.getOpcode() == ISD::SETCC) {
|
|
Result = DAG.getNode(ISD::BR_CC, MVT::Other, Tmp1, Tmp2.getOperand(2),
|
|
Tmp2.getOperand(0), Tmp2.getOperand(1),
|
|
Node->getOperand(4));
|
|
} else {
|
|
Result = DAG.getNode(ISD::BR_CC, MVT::Other, Tmp1,
|
|
DAG.getCondCode(ISD::SETNE),
|
|
Tmp2, DAG.getConstant(0, Tmp2.getValueType()),
|
|
Node->getOperand(4));
|
|
}
|
|
}
|
|
break;
|
|
case ISD::BRCONDTWOWAY:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
switch (getTypeAction(Node->getOperand(1).getValueType())) {
|
|
case Expand: assert(0 && "It's impossible to expand bools");
|
|
case Legal:
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the condition.
|
|
break;
|
|
case Promote:
|
|
Tmp2 = PromoteOp(Node->getOperand(1)); // Promote the condition.
|
|
break;
|
|
}
|
|
// If this target does not support BRCONDTWOWAY, lower it to a BRCOND/BR
|
|
// pair.
|
|
switch (TLI.getOperationAction(ISD::BRCONDTWOWAY, MVT::Other)) {
|
|
case TargetLowering::Promote:
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1)) {
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(Tmp1);
|
|
Ops.push_back(Tmp2);
|
|
Ops.push_back(Node->getOperand(2));
|
|
Ops.push_back(Node->getOperand(3));
|
|
Result = DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops);
|
|
}
|
|
break;
|
|
case TargetLowering::Expand:
|
|
// If BRTWOWAY_CC is legal for this target, then simply expand this node
|
|
// to that. Otherwise, skip BRTWOWAY_CC and expand directly to a
|
|
// BRCOND/BR pair.
|
|
if (TLI.isOperationLegal(ISD::BRTWOWAY_CC, MVT::Other)) {
|
|
if (Tmp2.getOpcode() == ISD::SETCC) {
|
|
Result = DAG.getBR2Way_CC(Tmp1, Tmp2.getOperand(2),
|
|
Tmp2.getOperand(0), Tmp2.getOperand(1),
|
|
Node->getOperand(2), Node->getOperand(3));
|
|
} else {
|
|
Result = DAG.getBR2Way_CC(Tmp1, DAG.getCondCode(ISD::SETNE), Tmp2,
|
|
DAG.getConstant(0, Tmp2.getValueType()),
|
|
Node->getOperand(2), Node->getOperand(3));
|
|
}
|
|
} else {
|
|
Result = DAG.getNode(ISD::BRCOND, MVT::Other, Tmp1, Tmp2,
|
|
Node->getOperand(2));
|
|
Result = DAG.getNode(ISD::BR, MVT::Other, Result, Node->getOperand(3));
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case ISD::BRTWOWAY_CC:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
if (isTypeLegal(Node->getOperand(2).getValueType())) {
|
|
Tmp2 = LegalizeOp(Node->getOperand(2)); // LHS
|
|
Tmp3 = LegalizeOp(Node->getOperand(3)); // RHS
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(2) ||
|
|
Tmp3 != Node->getOperand(3)) {
|
|
Result = DAG.getBR2Way_CC(Tmp1, Node->getOperand(1), Tmp2, Tmp3,
|
|
Node->getOperand(4), Node->getOperand(5));
|
|
}
|
|
break;
|
|
} else {
|
|
Tmp2 = LegalizeOp(DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(),
|
|
Node->getOperand(2), // LHS
|
|
Node->getOperand(3), // RHS
|
|
Node->getOperand(1)));
|
|
// If this target does not support BRTWOWAY_CC, lower it to a BRCOND/BR
|
|
// pair.
|
|
switch (TLI.getOperationAction(ISD::BRTWOWAY_CC, MVT::Other)) {
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Legal:
|
|
// If we get a SETCC back from legalizing the SETCC node we just
|
|
// created, then use its LHS, RHS, and CC directly in creating a new
|
|
// node. Otherwise, select between the true and false value based on
|
|
// comparing the result of the legalized with zero.
|
|
if (Tmp2.getOpcode() == ISD::SETCC) {
|
|
Result = DAG.getBR2Way_CC(Tmp1, Tmp2.getOperand(2),
|
|
Tmp2.getOperand(0), Tmp2.getOperand(1),
|
|
Node->getOperand(4), Node->getOperand(5));
|
|
} else {
|
|
Result = DAG.getBR2Way_CC(Tmp1, DAG.getCondCode(ISD::SETNE), Tmp2,
|
|
DAG.getConstant(0, Tmp2.getValueType()),
|
|
Node->getOperand(4), Node->getOperand(5));
|
|
}
|
|
break;
|
|
case TargetLowering::Expand:
|
|
Result = DAG.getNode(ISD::BRCOND, MVT::Other, Tmp1, Tmp2,
|
|
Node->getOperand(4));
|
|
Result = DAG.getNode(ISD::BR, MVT::Other, Result, Node->getOperand(5));
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case ISD::LOAD:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the pointer.
|
|
|
|
if (Tmp1 != Node->getOperand(0) ||
|
|
Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getLoad(Node->getValueType(0), Tmp1, Tmp2,
|
|
Node->getOperand(2));
|
|
else
|
|
Result = SDOperand(Node, 0);
|
|
|
|
// Since loads produce two values, make sure to remember that we legalized
|
|
// both of them.
|
|
AddLegalizedOperand(SDOperand(Node, 0), Result);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
|
|
case ISD::EXTLOAD:
|
|
case ISD::SEXTLOAD:
|
|
case ISD::ZEXTLOAD: {
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the pointer.
|
|
|
|
MVT::ValueType SrcVT = cast<VTSDNode>(Node->getOperand(3))->getVT();
|
|
switch (TLI.getOperationAction(Node->getOpcode(), SrcVT)) {
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Promote:
|
|
assert(SrcVT == MVT::i1 && "Can only promote EXTLOAD from i1 -> i8!");
|
|
Result = DAG.getExtLoad(Node->getOpcode(), Node->getValueType(0),
|
|
Tmp1, Tmp2, Node->getOperand(2), MVT::i8);
|
|
// Since loads produce two values, make sure to remember that we legalized
|
|
// both of them.
|
|
AddLegalizedOperand(SDOperand(Node, 0), Result);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) ||
|
|
Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getExtLoad(Node->getOpcode(), Node->getValueType(0),
|
|
Tmp1, Tmp2, Node->getOperand(2), SrcVT);
|
|
else
|
|
Result = SDOperand(Node, 0);
|
|
|
|
// Since loads produce two values, make sure to remember that we legalized
|
|
// both of them.
|
|
AddLegalizedOperand(SDOperand(Node, 0), Result);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
case TargetLowering::Expand:
|
|
//f64 = EXTLOAD f32 should expand to LOAD, FP_EXTEND
|
|
if (SrcVT == MVT::f32 && Node->getValueType(0) == MVT::f64) {
|
|
SDOperand Load = DAG.getLoad(SrcVT, Tmp1, Tmp2, Node->getOperand(2));
|
|
Result = DAG.getNode(ISD::FP_EXTEND, Node->getValueType(0), Load);
|
|
if (Op.ResNo)
|
|
return Load.getValue(1);
|
|
return Result;
|
|
}
|
|
assert(Node->getOpcode() != ISD::EXTLOAD &&
|
|
"EXTLOAD should always be supported!");
|
|
// Turn the unsupported load into an EXTLOAD followed by an explicit
|
|
// zero/sign extend inreg.
|
|
Result = DAG.getExtLoad(ISD::EXTLOAD, Node->getValueType(0),
|
|
Tmp1, Tmp2, Node->getOperand(2), SrcVT);
|
|
SDOperand ValRes;
|
|
if (Node->getOpcode() == ISD::SEXTLOAD)
|
|
ValRes = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(),
|
|
Result, DAG.getValueType(SrcVT));
|
|
else
|
|
ValRes = DAG.getZeroExtendInReg(Result, SrcVT);
|
|
AddLegalizedOperand(SDOperand(Node, 0), ValRes);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
if (Op.ResNo)
|
|
return Result.getValue(1);
|
|
return ValRes;
|
|
}
|
|
assert(0 && "Unreachable");
|
|
}
|
|
case ISD::EXTRACT_ELEMENT:
|
|
// Get both the low and high parts.
|
|
ExpandOp(Node->getOperand(0), Tmp1, Tmp2);
|
|
if (cast<ConstantSDNode>(Node->getOperand(1))->getValue())
|
|
Result = Tmp2; // 1 -> Hi
|
|
else
|
|
Result = Tmp1; // 0 -> Lo
|
|
break;
|
|
|
|
case ISD::CopyToReg:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
|
|
assert(isTypeLegal(Node->getOperand(2).getValueType()) &&
|
|
"Register type must be legal!");
|
|
// Legalize the incoming value (must be legal).
|
|
Tmp2 = LegalizeOp(Node->getOperand(2));
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(2))
|
|
Result = DAG.getNode(ISD::CopyToReg, MVT::Other, Tmp1,
|
|
Node->getOperand(1), Tmp2);
|
|
break;
|
|
|
|
case ISD::RET:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
switch (Node->getNumOperands()) {
|
|
case 2: // ret val
|
|
switch (getTypeAction(Node->getOperand(1).getValueType())) {
|
|
case Legal:
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getNode(ISD::RET, MVT::Other, Tmp1, Tmp2);
|
|
break;
|
|
case Expand: {
|
|
SDOperand Lo, Hi;
|
|
ExpandOp(Node->getOperand(1), Lo, Hi);
|
|
Result = DAG.getNode(ISD::RET, MVT::Other, Tmp1, Lo, Hi);
|
|
break;
|
|
}
|
|
case Promote:
|
|
Tmp2 = PromoteOp(Node->getOperand(1));
|
|
Result = DAG.getNode(ISD::RET, MVT::Other, Tmp1, Tmp2);
|
|
break;
|
|
}
|
|
break;
|
|
case 1: // ret void
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(ISD::RET, MVT::Other, Tmp1);
|
|
break;
|
|
default: { // ret <values>
|
|
std::vector<SDOperand> NewValues;
|
|
NewValues.push_back(Tmp1);
|
|
for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i)
|
|
switch (getTypeAction(Node->getOperand(i).getValueType())) {
|
|
case Legal:
|
|
NewValues.push_back(LegalizeOp(Node->getOperand(i)));
|
|
break;
|
|
case Expand: {
|
|
SDOperand Lo, Hi;
|
|
ExpandOp(Node->getOperand(i), Lo, Hi);
|
|
NewValues.push_back(Lo);
|
|
NewValues.push_back(Hi);
|
|
break;
|
|
}
|
|
case Promote:
|
|
assert(0 && "Can't promote multiple return value yet!");
|
|
}
|
|
Result = DAG.getNode(ISD::RET, MVT::Other, NewValues);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case ISD::STORE:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(2)); // Legalize the pointer.
|
|
|
|
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
|
|
if (ConstantFPSDNode *CFP =dyn_cast<ConstantFPSDNode>(Node->getOperand(1))){
|
|
if (CFP->getValueType(0) == MVT::f32) {
|
|
Result = DAG.getNode(ISD::STORE, MVT::Other, Tmp1,
|
|
DAG.getConstant(FloatToBits(CFP->getValue()),
|
|
MVT::i32),
|
|
Tmp2,
|
|
Node->getOperand(3));
|
|
} else {
|
|
assert(CFP->getValueType(0) == MVT::f64 && "Unknown FP type!");
|
|
Result = DAG.getNode(ISD::STORE, MVT::Other, Tmp1,
|
|
DAG.getConstant(DoubleToBits(CFP->getValue()),
|
|
MVT::i64),
|
|
Tmp2,
|
|
Node->getOperand(3));
|
|
}
|
|
Node = Result.Val;
|
|
}
|
|
|
|
switch (getTypeAction(Node->getOperand(1).getValueType())) {
|
|
case Legal: {
|
|
SDOperand Val = LegalizeOp(Node->getOperand(1));
|
|
if (Val != Node->getOperand(1) || Tmp1 != Node->getOperand(0) ||
|
|
Tmp2 != Node->getOperand(2))
|
|
Result = DAG.getNode(ISD::STORE, MVT::Other, Tmp1, Val, Tmp2,
|
|
Node->getOperand(3));
|
|
break;
|
|
}
|
|
case Promote:
|
|
// Truncate the value and store the result.
|
|
Tmp3 = PromoteOp(Node->getOperand(1));
|
|
Result = DAG.getNode(ISD::TRUNCSTORE, MVT::Other, Tmp1, Tmp3, Tmp2,
|
|
Node->getOperand(3),
|
|
DAG.getValueType(Node->getOperand(1).getValueType()));
|
|
break;
|
|
|
|
case Expand:
|
|
SDOperand Lo, Hi;
|
|
ExpandOp(Node->getOperand(1), Lo, Hi);
|
|
|
|
if (!TLI.isLittleEndian())
|
|
std::swap(Lo, Hi);
|
|
|
|
Lo = DAG.getNode(ISD::STORE, MVT::Other, Tmp1, Lo, Tmp2,
|
|
Node->getOperand(3));
|
|
unsigned IncrementSize = MVT::getSizeInBits(Hi.getValueType())/8;
|
|
Tmp2 = DAG.getNode(ISD::ADD, Tmp2.getValueType(), Tmp2,
|
|
getIntPtrConstant(IncrementSize));
|
|
assert(isTypeLegal(Tmp2.getValueType()) &&
|
|
"Pointers must be legal!");
|
|
//Again, claiming both parts of the store came form the same Instr
|
|
Hi = DAG.getNode(ISD::STORE, MVT::Other, Tmp1, Hi, Tmp2,
|
|
Node->getOperand(3));
|
|
Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
|
|
break;
|
|
}
|
|
break;
|
|
case ISD::PCMARKER:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(ISD::PCMARKER, MVT::Other, Tmp1,Node->getOperand(1));
|
|
break;
|
|
case ISD::TRUNCSTORE:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp3 = LegalizeOp(Node->getOperand(2)); // Legalize the pointer.
|
|
|
|
switch (getTypeAction(Node->getOperand(1).getValueType())) {
|
|
case Legal:
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
|
|
// The only promote case we handle is TRUNCSTORE:i1 X into
|
|
// -> TRUNCSTORE:i8 (and X, 1)
|
|
if (cast<VTSDNode>(Node->getOperand(4))->getVT() == MVT::i1 &&
|
|
TLI.getOperationAction(ISD::TRUNCSTORE, MVT::i1) ==
|
|
TargetLowering::Promote) {
|
|
// Promote the bool to a mask then store.
|
|
Tmp2 = DAG.getNode(ISD::AND, Tmp2.getValueType(), Tmp2,
|
|
DAG.getConstant(1, Tmp2.getValueType()));
|
|
Result = DAG.getNode(ISD::TRUNCSTORE, MVT::Other, Tmp1, Tmp2, Tmp3,
|
|
Node->getOperand(3), DAG.getValueType(MVT::i8));
|
|
|
|
} else if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2)) {
|
|
Result = DAG.getNode(ISD::TRUNCSTORE, MVT::Other, Tmp1, Tmp2, Tmp3,
|
|
Node->getOperand(3), Node->getOperand(4));
|
|
}
|
|
break;
|
|
case Promote:
|
|
case Expand:
|
|
assert(0 && "Cannot handle illegal TRUNCSTORE yet!");
|
|
}
|
|
break;
|
|
case ISD::SELECT:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "It's impossible to expand bools");
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the condition.
|
|
break;
|
|
case Promote:
|
|
Tmp1 = PromoteOp(Node->getOperand(0)); // Promote the condition.
|
|
break;
|
|
}
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // TrueVal
|
|
Tmp3 = LegalizeOp(Node->getOperand(2)); // FalseVal
|
|
|
|
switch (TLI.getOperationAction(ISD::SELECT, Tmp2.getValueType())) {
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Expand:
|
|
if (Tmp1.getOpcode() == ISD::SETCC) {
|
|
Result = DAG.getSelectCC(Tmp1.getOperand(0), Tmp1.getOperand(1),
|
|
Tmp2, Tmp3,
|
|
cast<CondCodeSDNode>(Tmp1.getOperand(2))->get());
|
|
} else {
|
|
// Make sure the condition is either zero or one. It may have been
|
|
// promoted from something else.
|
|
Tmp1 = DAG.getZeroExtendInReg(Tmp1, MVT::i1);
|
|
Result = DAG.getSelectCC(Tmp1,
|
|
DAG.getConstant(0, Tmp1.getValueType()),
|
|
Tmp2, Tmp3, ISD::SETNE);
|
|
}
|
|
break;
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2))
|
|
Result = DAG.getNode(ISD::SELECT, Node->getValueType(0),
|
|
Tmp1, Tmp2, Tmp3);
|
|
break;
|
|
case TargetLowering::Promote: {
|
|
MVT::ValueType NVT =
|
|
TLI.getTypeToPromoteTo(ISD::SELECT, Tmp2.getValueType());
|
|
unsigned ExtOp, TruncOp;
|
|
if (MVT::isInteger(Tmp2.getValueType())) {
|
|
ExtOp = ISD::ANY_EXTEND;
|
|
TruncOp = ISD::TRUNCATE;
|
|
} else {
|
|
ExtOp = ISD::FP_EXTEND;
|
|
TruncOp = ISD::FP_ROUND;
|
|
}
|
|
// Promote each of the values to the new type.
|
|
Tmp2 = DAG.getNode(ExtOp, NVT, Tmp2);
|
|
Tmp3 = DAG.getNode(ExtOp, NVT, Tmp3);
|
|
// Perform the larger operation, then round down.
|
|
Result = DAG.getNode(ISD::SELECT, NVT, Tmp1, Tmp2,Tmp3);
|
|
Result = DAG.getNode(TruncOp, Node->getValueType(0), Result);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case ISD::SELECT_CC:
|
|
Tmp3 = LegalizeOp(Node->getOperand(2)); // True
|
|
Tmp4 = LegalizeOp(Node->getOperand(3)); // False
|
|
|
|
if (isTypeLegal(Node->getOperand(0).getValueType())) {
|
|
// Everything is legal, see if we should expand this op or something.
|
|
switch (TLI.getOperationAction(ISD::SELECT_CC,
|
|
Node->getOperand(0).getValueType())) {
|
|
default: assert(0 && "This action is not supported yet!");
|
|
case TargetLowering::Custom: {
|
|
SDOperand Tmp =
|
|
TLI.LowerOperation(DAG.getNode(ISD::SELECT_CC, Node->getValueType(0),
|
|
Node->getOperand(0),
|
|
Node->getOperand(1), Tmp3, Tmp4,
|
|
Node->getOperand(4)), DAG);
|
|
if (Tmp.Val) {
|
|
Result = LegalizeOp(Tmp);
|
|
break;
|
|
}
|
|
} // FALLTHROUGH if the target can't lower this operation after all.
|
|
case TargetLowering::Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // LHS
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // RHS
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2) || Tmp4 != Node->getOperand(3)) {
|
|
Result = DAG.getNode(ISD::SELECT_CC, Node->getValueType(0), Tmp1, Tmp2,
|
|
Tmp3, Tmp4, Node->getOperand(4));
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
} else {
|
|
Tmp1 = LegalizeOp(DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(),
|
|
Node->getOperand(0), // LHS
|
|
Node->getOperand(1), // RHS
|
|
Node->getOperand(4)));
|
|
// If we get a SETCC back from legalizing the SETCC node we just
|
|
// created, then use its LHS, RHS, and CC directly in creating a new
|
|
// node. Otherwise, select between the true and false value based on
|
|
// comparing the result of the legalized with zero.
|
|
if (Tmp1.getOpcode() == ISD::SETCC) {
|
|
Result = DAG.getNode(ISD::SELECT_CC, Tmp3.getValueType(),
|
|
Tmp1.getOperand(0), Tmp1.getOperand(1),
|
|
Tmp3, Tmp4, Tmp1.getOperand(2));
|
|
} else {
|
|
Result = DAG.getSelectCC(Tmp1,
|
|
DAG.getConstant(0, Tmp1.getValueType()),
|
|
Tmp3, Tmp4, ISD::SETNE);
|
|
}
|
|
}
|
|
break;
|
|
case ISD::SETCC:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // LHS
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // RHS
|
|
break;
|
|
case Promote:
|
|
Tmp1 = PromoteOp(Node->getOperand(0)); // LHS
|
|
Tmp2 = PromoteOp(Node->getOperand(1)); // RHS
|
|
|
|
// If this is an FP compare, the operands have already been extended.
|
|
if (MVT::isInteger(Node->getOperand(0).getValueType())) {
|
|
MVT::ValueType VT = Node->getOperand(0).getValueType();
|
|
MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
|
|
|
|
// Otherwise, we have to insert explicit sign or zero extends. Note
|
|
// that we could insert sign extends for ALL conditions, but zero extend
|
|
// is cheaper on many machines (an AND instead of two shifts), so prefer
|
|
// it.
|
|
switch (cast<CondCodeSDNode>(Node->getOperand(2))->get()) {
|
|
default: assert(0 && "Unknown integer comparison!");
|
|
case ISD::SETEQ:
|
|
case ISD::SETNE:
|
|
case ISD::SETUGE:
|
|
case ISD::SETUGT:
|
|
case ISD::SETULE:
|
|
case ISD::SETULT:
|
|
// ALL of these operations will work if we either sign or zero extend
|
|
// the operands (including the unsigned comparisons!). Zero extend is
|
|
// usually a simpler/cheaper operation, so prefer it.
|
|
Tmp1 = DAG.getZeroExtendInReg(Tmp1, VT);
|
|
Tmp2 = DAG.getZeroExtendInReg(Tmp2, VT);
|
|
break;
|
|
case ISD::SETGE:
|
|
case ISD::SETGT:
|
|
case ISD::SETLT:
|
|
case ISD::SETLE:
|
|
Tmp1 = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Tmp1,
|
|
DAG.getValueType(VT));
|
|
Tmp2 = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Tmp2,
|
|
DAG.getValueType(VT));
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case Expand:
|
|
SDOperand LHSLo, LHSHi, RHSLo, RHSHi;
|
|
ExpandOp(Node->getOperand(0), LHSLo, LHSHi);
|
|
ExpandOp(Node->getOperand(1), RHSLo, RHSHi);
|
|
switch (cast<CondCodeSDNode>(Node->getOperand(2))->get()) {
|
|
case ISD::SETEQ:
|
|
case ISD::SETNE:
|
|
if (RHSLo == RHSHi)
|
|
if (ConstantSDNode *RHSCST = dyn_cast<ConstantSDNode>(RHSLo))
|
|
if (RHSCST->isAllOnesValue()) {
|
|
// Comparison to -1.
|
|
Tmp1 = DAG.getNode(ISD::AND, LHSLo.getValueType(), LHSLo, LHSHi);
|
|
Tmp2 = RHSLo;
|
|
break;
|
|
}
|
|
|
|
Tmp1 = DAG.getNode(ISD::XOR, LHSLo.getValueType(), LHSLo, RHSLo);
|
|
Tmp2 = DAG.getNode(ISD::XOR, LHSLo.getValueType(), LHSHi, RHSHi);
|
|
Tmp1 = DAG.getNode(ISD::OR, Tmp1.getValueType(), Tmp1, Tmp2);
|
|
Tmp2 = DAG.getConstant(0, Tmp1.getValueType());
|
|
break;
|
|
default:
|
|
// If this is a comparison of the sign bit, just look at the top part.
|
|
// X > -1, x < 0
|
|
if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Node->getOperand(1)))
|
|
if ((cast<CondCodeSDNode>(Node->getOperand(2))->get() == ISD::SETLT &&
|
|
CST->getValue() == 0) || // X < 0
|
|
(cast<CondCodeSDNode>(Node->getOperand(2))->get() == ISD::SETGT &&
|
|
(CST->isAllOnesValue()))) { // X > -1
|
|
Tmp1 = LHSHi;
|
|
Tmp2 = RHSHi;
|
|
break;
|
|
}
|
|
|
|
// FIXME: This generated code sucks.
|
|
ISD::CondCode LowCC;
|
|
switch (cast<CondCodeSDNode>(Node->getOperand(2))->get()) {
|
|
default: assert(0 && "Unknown integer setcc!");
|
|
case ISD::SETLT:
|
|
case ISD::SETULT: LowCC = ISD::SETULT; break;
|
|
case ISD::SETGT:
|
|
case ISD::SETUGT: LowCC = ISD::SETUGT; break;
|
|
case ISD::SETLE:
|
|
case ISD::SETULE: LowCC = ISD::SETULE; break;
|
|
case ISD::SETGE:
|
|
case ISD::SETUGE: LowCC = ISD::SETUGE; break;
|
|
}
|
|
|
|
// Tmp1 = lo(op1) < lo(op2) // Always unsigned comparison
|
|
// Tmp2 = hi(op1) < hi(op2) // Signedness depends on operands
|
|
// dest = hi(op1) == hi(op2) ? Tmp1 : Tmp2;
|
|
|
|
// NOTE: on targets without efficient SELECT of bools, we can always use
|
|
// this identity: (B1 ? B2 : B3) --> (B1 & B2)|(!B1&B3)
|
|
Tmp1 = DAG.getSetCC(Node->getValueType(0), LHSLo, RHSLo, LowCC);
|
|
Tmp2 = DAG.getNode(ISD::SETCC, Node->getValueType(0), LHSHi, RHSHi,
|
|
Node->getOperand(2));
|
|
Result = DAG.getSetCC(Node->getValueType(0), LHSHi, RHSHi, ISD::SETEQ);
|
|
Result = LegalizeOp(DAG.getNode(ISD::SELECT, Tmp1.getValueType(),
|
|
Result, Tmp1, Tmp2));
|
|
return Result;
|
|
}
|
|
}
|
|
|
|
switch(TLI.getOperationAction(ISD::SETCC, Node->getOperand(0).getValueType())) {
|
|
default:
|
|
assert(0 && "Cannot handle this action for SETCC yet!");
|
|
break;
|
|
case TargetLowering::Promote:
|
|
Result = DAG.getNode(ISD::SETCC, Node->getValueType(0), Tmp1, Tmp2,
|
|
Node->getOperand(2));
|
|
break;
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getNode(ISD::SETCC, Node->getValueType(0), Tmp1, Tmp2,
|
|
Node->getOperand(2));
|
|
break;
|
|
case TargetLowering::Expand:
|
|
// Expand a setcc node into a select_cc of the same condition, lhs, and
|
|
// rhs that selects between const 1 (true) and const 0 (false).
|
|
MVT::ValueType VT = Node->getValueType(0);
|
|
Result = DAG.getNode(ISD::SELECT_CC, VT, Tmp1, Tmp2,
|
|
DAG.getConstant(1, VT), DAG.getConstant(0, VT),
|
|
Node->getOperand(2));
|
|
Result = LegalizeOp(Result);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::MEMSET:
|
|
case ISD::MEMCPY:
|
|
case ISD::MEMMOVE: {
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Chain
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Pointer
|
|
|
|
if (Node->getOpcode() == ISD::MEMSET) { // memset = ubyte
|
|
switch (getTypeAction(Node->getOperand(2).getValueType())) {
|
|
case Expand: assert(0 && "Cannot expand a byte!");
|
|
case Legal:
|
|
Tmp3 = LegalizeOp(Node->getOperand(2));
|
|
break;
|
|
case Promote:
|
|
Tmp3 = PromoteOp(Node->getOperand(2));
|
|
break;
|
|
}
|
|
} else {
|
|
Tmp3 = LegalizeOp(Node->getOperand(2)); // memcpy/move = pointer,
|
|
}
|
|
|
|
SDOperand Tmp4;
|
|
switch (getTypeAction(Node->getOperand(3).getValueType())) {
|
|
case Expand: {
|
|
// Length is too big, just take the lo-part of the length.
|
|
SDOperand HiPart;
|
|
ExpandOp(Node->getOperand(3), HiPart, Tmp4);
|
|
break;
|
|
}
|
|
case Legal:
|
|
Tmp4 = LegalizeOp(Node->getOperand(3));
|
|
break;
|
|
case Promote:
|
|
Tmp4 = PromoteOp(Node->getOperand(3));
|
|
break;
|
|
}
|
|
|
|
SDOperand Tmp5;
|
|
switch (getTypeAction(Node->getOperand(4).getValueType())) { // uint
|
|
case Expand: assert(0 && "Cannot expand this yet!");
|
|
case Legal:
|
|
Tmp5 = LegalizeOp(Node->getOperand(4));
|
|
break;
|
|
case Promote:
|
|
Tmp5 = PromoteOp(Node->getOperand(4));
|
|
break;
|
|
}
|
|
|
|
switch (TLI.getOperationAction(Node->getOpcode(), MVT::Other)) {
|
|
default: assert(0 && "This action not implemented for this operation!");
|
|
case TargetLowering::Custom: {
|
|
SDOperand Tmp =
|
|
TLI.LowerOperation(DAG.getNode(Node->getOpcode(), MVT::Other, Tmp1,
|
|
Tmp2, Tmp3, Tmp4, Tmp5), DAG);
|
|
if (Tmp.Val) {
|
|
Result = LegalizeOp(Tmp);
|
|
break;
|
|
}
|
|
// FALLTHROUGH if the target thinks it is legal.
|
|
}
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2) || Tmp4 != Node->getOperand(3) ||
|
|
Tmp5 != Node->getOperand(4)) {
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(Tmp1); Ops.push_back(Tmp2); Ops.push_back(Tmp3);
|
|
Ops.push_back(Tmp4); Ops.push_back(Tmp5);
|
|
Result = DAG.getNode(Node->getOpcode(), MVT::Other, Ops);
|
|
}
|
|
break;
|
|
case TargetLowering::Expand: {
|
|
// Otherwise, the target does not support this operation. Lower the
|
|
// operation to an explicit libcall as appropriate.
|
|
MVT::ValueType IntPtr = TLI.getPointerTy();
|
|
const Type *IntPtrTy = TLI.getTargetData().getIntPtrType();
|
|
std::vector<std::pair<SDOperand, const Type*> > Args;
|
|
|
|
const char *FnName = 0;
|
|
if (Node->getOpcode() == ISD::MEMSET) {
|
|
Args.push_back(std::make_pair(Tmp2, IntPtrTy));
|
|
// Extend the ubyte argument to be an int value for the call.
|
|
Tmp3 = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Tmp3);
|
|
Args.push_back(std::make_pair(Tmp3, Type::IntTy));
|
|
Args.push_back(std::make_pair(Tmp4, IntPtrTy));
|
|
|
|
FnName = "memset";
|
|
} else if (Node->getOpcode() == ISD::MEMCPY ||
|
|
Node->getOpcode() == ISD::MEMMOVE) {
|
|
Args.push_back(std::make_pair(Tmp2, IntPtrTy));
|
|
Args.push_back(std::make_pair(Tmp3, IntPtrTy));
|
|
Args.push_back(std::make_pair(Tmp4, IntPtrTy));
|
|
FnName = Node->getOpcode() == ISD::MEMMOVE ? "memmove" : "memcpy";
|
|
} else {
|
|
assert(0 && "Unknown op!");
|
|
}
|
|
|
|
std::pair<SDOperand,SDOperand> CallResult =
|
|
TLI.LowerCallTo(Tmp1, Type::VoidTy, false, CallingConv::C, false,
|
|
DAG.getExternalSymbol(FnName, IntPtr), Args, DAG);
|
|
Result = CallResult.second;
|
|
NeedsAnotherIteration = true;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case ISD::READPORT:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1)) {
|
|
std::vector<MVT::ValueType> VTs(Node->value_begin(), Node->value_end());
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(Tmp1);
|
|
Ops.push_back(Tmp2);
|
|
Result = DAG.getNode(ISD::READPORT, VTs, Ops);
|
|
} else
|
|
Result = SDOperand(Node, 0);
|
|
// Since these produce two values, make sure to remember that we legalized
|
|
// both of them.
|
|
AddLegalizedOperand(SDOperand(Node, 0), Result);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
case ISD::WRITEPORT:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
Tmp3 = LegalizeOp(Node->getOperand(2));
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2))
|
|
Result = DAG.getNode(Node->getOpcode(), MVT::Other, Tmp1, Tmp2, Tmp3);
|
|
break;
|
|
|
|
case ISD::READIO:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
|
|
switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
|
|
case TargetLowering::Custom:
|
|
default: assert(0 && "This action not implemented for this operation!");
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1)) {
|
|
std::vector<MVT::ValueType> VTs(Node->value_begin(), Node->value_end());
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(Tmp1);
|
|
Ops.push_back(Tmp2);
|
|
Result = DAG.getNode(ISD::READPORT, VTs, Ops);
|
|
} else
|
|
Result = SDOperand(Node, 0);
|
|
break;
|
|
case TargetLowering::Expand:
|
|
// Replace this with a load from memory.
|
|
Result = DAG.getLoad(Node->getValueType(0), Node->getOperand(0),
|
|
Node->getOperand(1), DAG.getSrcValue(NULL));
|
|
Result = LegalizeOp(Result);
|
|
break;
|
|
}
|
|
|
|
// Since these produce two values, make sure to remember that we legalized
|
|
// both of them.
|
|
AddLegalizedOperand(SDOperand(Node, 0), Result);
|
|
AddLegalizedOperand(SDOperand(Node, 1), Result.getValue(1));
|
|
return Result.getValue(Op.ResNo);
|
|
|
|
case ISD::WRITEIO:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
Tmp3 = LegalizeOp(Node->getOperand(2));
|
|
|
|
switch (TLI.getOperationAction(Node->getOpcode(),
|
|
Node->getOperand(1).getValueType())) {
|
|
case TargetLowering::Custom:
|
|
default: assert(0 && "This action not implemented for this operation!");
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1) ||
|
|
Tmp3 != Node->getOperand(2))
|
|
Result = DAG.getNode(Node->getOpcode(), MVT::Other, Tmp1, Tmp2, Tmp3);
|
|
break;
|
|
case TargetLowering::Expand:
|
|
// Replace this with a store to memory.
|
|
Result = DAG.getNode(ISD::STORE, MVT::Other, Node->getOperand(0),
|
|
Node->getOperand(1), Node->getOperand(2),
|
|
DAG.getSrcValue(NULL));
|
|
Result = LegalizeOp(Result);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::ADD_PARTS:
|
|
case ISD::SUB_PARTS:
|
|
case ISD::SHL_PARTS:
|
|
case ISD::SRA_PARTS:
|
|
case ISD::SRL_PARTS: {
|
|
std::vector<SDOperand> Ops;
|
|
bool Changed = false;
|
|
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
|
|
Ops.push_back(LegalizeOp(Node->getOperand(i)));
|
|
Changed |= Ops.back() != Node->getOperand(i);
|
|
}
|
|
if (Changed) {
|
|
std::vector<MVT::ValueType> VTs(Node->value_begin(), Node->value_end());
|
|
Result = DAG.getNode(Node->getOpcode(), VTs, Ops);
|
|
}
|
|
|
|
// Since these produce multiple values, make sure to remember that we
|
|
// legalized all of them.
|
|
for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
|
|
AddLegalizedOperand(SDOperand(Node, i), Result.getValue(i));
|
|
return Result.getValue(Op.ResNo);
|
|
}
|
|
|
|
// Binary operators
|
|
case ISD::ADD:
|
|
case ISD::SUB:
|
|
case ISD::MUL:
|
|
case ISD::MULHS:
|
|
case ISD::MULHU:
|
|
case ISD::UDIV:
|
|
case ISD::SDIV:
|
|
case ISD::AND:
|
|
case ISD::OR:
|
|
case ISD::XOR:
|
|
case ISD::SHL:
|
|
case ISD::SRL:
|
|
case ISD::SRA:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // LHS
|
|
switch (getTypeAction(Node->getOperand(1).getValueType())) {
|
|
case Expand: assert(0 && "Not possible");
|
|
case Legal:
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the RHS.
|
|
break;
|
|
case Promote:
|
|
Tmp2 = PromoteOp(Node->getOperand(1)); // Promote the RHS.
|
|
break;
|
|
}
|
|
if (Tmp1 != Node->getOperand(0) ||
|
|
Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1,Tmp2);
|
|
break;
|
|
|
|
case ISD::UREM:
|
|
case ISD::SREM:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // LHS
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // RHS
|
|
switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0) ||
|
|
Tmp2 != Node->getOperand(1))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1,
|
|
Tmp2);
|
|
break;
|
|
case TargetLowering::Promote:
|
|
case TargetLowering::Custom:
|
|
assert(0 && "Cannot promote/custom handle this yet!");
|
|
case TargetLowering::Expand:
|
|
if (MVT::isInteger(Node->getValueType(0))) {
|
|
MVT::ValueType VT = Node->getValueType(0);
|
|
unsigned Opc = (Node->getOpcode() == ISD::UREM) ? ISD::UDIV : ISD::SDIV;
|
|
Result = DAG.getNode(Opc, VT, Tmp1, Tmp2);
|
|
Result = DAG.getNode(ISD::MUL, VT, Result, Tmp2);
|
|
Result = DAG.getNode(ISD::SUB, VT, Tmp1, Result);
|
|
} else {
|
|
// Floating point mod -> fmod libcall.
|
|
const char *FnName = Node->getValueType(0) == MVT::f32 ? "fmodf":"fmod";
|
|
SDOperand Dummy;
|
|
Result = ExpandLibCall(FnName, Node, Dummy);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::CTPOP:
|
|
case ISD::CTTZ:
|
|
case ISD::CTLZ:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Op
|
|
switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
break;
|
|
case TargetLowering::Promote: {
|
|
MVT::ValueType OVT = Tmp1.getValueType();
|
|
MVT::ValueType NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), OVT);
|
|
|
|
// Zero extend the argument.
|
|
Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, NVT, Tmp1);
|
|
// Perform the larger operation, then subtract if needed.
|
|
Tmp1 = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
switch(Node->getOpcode())
|
|
{
|
|
case ISD::CTPOP:
|
|
Result = Tmp1;
|
|
break;
|
|
case ISD::CTTZ:
|
|
//if Tmp1 == sizeinbits(NVT) then Tmp1 = sizeinbits(Old VT)
|
|
Tmp2 = DAG.getSetCC(TLI.getSetCCResultTy(), Tmp1,
|
|
DAG.getConstant(getSizeInBits(NVT), NVT),
|
|
ISD::SETEQ);
|
|
Result = DAG.getNode(ISD::SELECT, NVT, Tmp2,
|
|
DAG.getConstant(getSizeInBits(OVT),NVT), Tmp1);
|
|
break;
|
|
case ISD::CTLZ:
|
|
//Tmp1 = Tmp1 - (sizeinbits(NVT) - sizeinbits(Old VT))
|
|
Result = DAG.getNode(ISD::SUB, NVT, Tmp1,
|
|
DAG.getConstant(getSizeInBits(NVT) -
|
|
getSizeInBits(OVT), NVT));
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
case TargetLowering::Custom:
|
|
assert(0 && "Cannot custom handle this yet!");
|
|
case TargetLowering::Expand:
|
|
switch(Node->getOpcode())
|
|
{
|
|
case ISD::CTPOP: {
|
|
static const uint64_t mask[6] = {
|
|
0x5555555555555555ULL, 0x3333333333333333ULL,
|
|
0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
|
|
0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
|
|
};
|
|
MVT::ValueType VT = Tmp1.getValueType();
|
|
MVT::ValueType ShVT = TLI.getShiftAmountTy();
|
|
unsigned len = getSizeInBits(VT);
|
|
for (unsigned i = 0; (1U << i) <= (len / 2); ++i) {
|
|
//x = (x & mask[i][len/8]) + (x >> (1 << i) & mask[i][len/8])
|
|
Tmp2 = DAG.getConstant(mask[i], VT);
|
|
Tmp3 = DAG.getConstant(1ULL << i, ShVT);
|
|
Tmp1 = DAG.getNode(ISD::ADD, VT,
|
|
DAG.getNode(ISD::AND, VT, Tmp1, Tmp2),
|
|
DAG.getNode(ISD::AND, VT,
|
|
DAG.getNode(ISD::SRL, VT, Tmp1, Tmp3),
|
|
Tmp2));
|
|
}
|
|
Result = Tmp1;
|
|
break;
|
|
}
|
|
case ISD::CTLZ: {
|
|
/* for now, we do this:
|
|
x = x | (x >> 1);
|
|
x = x | (x >> 2);
|
|
...
|
|
x = x | (x >>16);
|
|
x = x | (x >>32); // for 64-bit input
|
|
return popcount(~x);
|
|
|
|
but see also: http://www.hackersdelight.org/HDcode/nlz.cc */
|
|
MVT::ValueType VT = Tmp1.getValueType();
|
|
MVT::ValueType ShVT = TLI.getShiftAmountTy();
|
|
unsigned len = getSizeInBits(VT);
|
|
for (unsigned i = 0; (1U << i) <= (len / 2); ++i) {
|
|
Tmp3 = DAG.getConstant(1ULL << i, ShVT);
|
|
Tmp1 = DAG.getNode(ISD::OR, VT, Tmp1,
|
|
DAG.getNode(ISD::SRL, VT, Tmp1, Tmp3));
|
|
}
|
|
Tmp3 = DAG.getNode(ISD::XOR, VT, Tmp1, DAG.getConstant(~0ULL, VT));
|
|
Result = LegalizeOp(DAG.getNode(ISD::CTPOP, VT, Tmp3));
|
|
break;
|
|
}
|
|
case ISD::CTTZ: {
|
|
// for now, we use: { return popcount(~x & (x - 1)); }
|
|
// unless the target has ctlz but not ctpop, in which case we use:
|
|
// { return 32 - nlz(~x & (x-1)); }
|
|
// see also http://www.hackersdelight.org/HDcode/ntz.cc
|
|
MVT::ValueType VT = Tmp1.getValueType();
|
|
Tmp2 = DAG.getConstant(~0ULL, VT);
|
|
Tmp3 = DAG.getNode(ISD::AND, VT,
|
|
DAG.getNode(ISD::XOR, VT, Tmp1, Tmp2),
|
|
DAG.getNode(ISD::SUB, VT, Tmp1,
|
|
DAG.getConstant(1, VT)));
|
|
// If ISD::CTLZ is legal and CTPOP isn't, then do that instead
|
|
if (!TLI.isOperationLegal(ISD::CTPOP, VT) &&
|
|
TLI.isOperationLegal(ISD::CTLZ, VT)) {
|
|
Result = LegalizeOp(DAG.getNode(ISD::SUB, VT,
|
|
DAG.getConstant(getSizeInBits(VT), VT),
|
|
DAG.getNode(ISD::CTLZ, VT, Tmp3)));
|
|
} else {
|
|
Result = LegalizeOp(DAG.getNode(ISD::CTPOP, VT, Tmp3));
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
assert(0 && "Cannot expand this yet!");
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
// Unary operators
|
|
case ISD::FABS:
|
|
case ISD::FNEG:
|
|
case ISD::FSQRT:
|
|
case ISD::FSIN:
|
|
case ISD::FCOS:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
break;
|
|
case TargetLowering::Promote:
|
|
case TargetLowering::Custom:
|
|
assert(0 && "Cannot promote/custom handle this yet!");
|
|
case TargetLowering::Expand:
|
|
switch(Node->getOpcode()) {
|
|
case ISD::FNEG: {
|
|
// Expand Y = FNEG(X) -> Y = SUB -0.0, X
|
|
Tmp2 = DAG.getConstantFP(-0.0, Node->getValueType(0));
|
|
Result = LegalizeOp(DAG.getNode(ISD::SUB, Node->getValueType(0),
|
|
Tmp2, Tmp1));
|
|
break;
|
|
}
|
|
case ISD::FABS: {
|
|
// Expand Y = FABS(X) -> Y = (X >u 0.0) ? X : fneg(X).
|
|
MVT::ValueType VT = Node->getValueType(0);
|
|
Tmp2 = DAG.getConstantFP(0.0, VT);
|
|
Tmp2 = DAG.getSetCC(TLI.getSetCCResultTy(), Tmp1, Tmp2, ISD::SETUGT);
|
|
Tmp3 = DAG.getNode(ISD::FNEG, VT, Tmp1);
|
|
Result = DAG.getNode(ISD::SELECT, VT, Tmp2, Tmp1, Tmp3);
|
|
Result = LegalizeOp(Result);
|
|
break;
|
|
}
|
|
case ISD::FSQRT:
|
|
case ISD::FSIN:
|
|
case ISD::FCOS: {
|
|
MVT::ValueType VT = Node->getValueType(0);
|
|
const char *FnName = 0;
|
|
switch(Node->getOpcode()) {
|
|
case ISD::FSQRT: FnName = VT == MVT::f32 ? "sqrtf" : "sqrt"; break;
|
|
case ISD::FSIN: FnName = VT == MVT::f32 ? "sinf" : "sin"; break;
|
|
case ISD::FCOS: FnName = VT == MVT::f32 ? "cosf" : "cos"; break;
|
|
default: assert(0 && "Unreachable!");
|
|
}
|
|
SDOperand Dummy;
|
|
Result = ExpandLibCall(FnName, Node, Dummy);
|
|
break;
|
|
}
|
|
default:
|
|
assert(0 && "Unreachable!");
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
// Conversion operators. The source and destination have different types.
|
|
case ISD::SINT_TO_FP:
|
|
case ISD::UINT_TO_FP: {
|
|
bool isSigned = Node->getOpcode() == ISD::SINT_TO_FP;
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
switch (TLI.getOperationAction(Node->getOpcode(),
|
|
Node->getOperand(0).getValueType())) {
|
|
default: assert(0 && "Unknown operation action!");
|
|
case TargetLowering::Expand:
|
|
Result = ExpandLegalINT_TO_FP(isSigned,
|
|
LegalizeOp(Node->getOperand(0)),
|
|
Node->getValueType(0));
|
|
AddLegalizedOperand(Op, Result);
|
|
return Result;
|
|
case TargetLowering::Promote:
|
|
Result = PromoteLegalINT_TO_FP(LegalizeOp(Node->getOperand(0)),
|
|
Node->getValueType(0),
|
|
isSigned);
|
|
AddLegalizedOperand(Op, Result);
|
|
return Result;
|
|
case TargetLowering::Legal:
|
|
break;
|
|
}
|
|
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
break;
|
|
case Expand:
|
|
Result = ExpandIntToFP(Node->getOpcode() == ISD::SINT_TO_FP,
|
|
Node->getValueType(0), Node->getOperand(0));
|
|
break;
|
|
case Promote:
|
|
if (isSigned) {
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(),
|
|
Result, DAG.getValueType(Node->getOperand(0).getValueType()));
|
|
Result = DAG.getNode(ISD::SINT_TO_FP, Op.getValueType(), Result);
|
|
} else {
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getZeroExtendInReg(Result,
|
|
Node->getOperand(0).getValueType());
|
|
Result = DAG.getNode(ISD::UINT_TO_FP, Op.getValueType(), Result);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
case ISD::TRUNCATE:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
break;
|
|
case Expand:
|
|
ExpandOp(Node->getOperand(0), Tmp1, Tmp2);
|
|
|
|
// Since the result is legal, we should just be able to truncate the low
|
|
// part of the source.
|
|
Result = DAG.getNode(ISD::TRUNCATE, Node->getValueType(0), Tmp1);
|
|
break;
|
|
case Promote:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(ISD::TRUNCATE, Op.getValueType(), Result);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::FP_TO_SINT:
|
|
case ISD::FP_TO_UINT:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
|
|
switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))){
|
|
default: assert(0 && "Unknown operation action!");
|
|
case TargetLowering::Expand:
|
|
if (Node->getOpcode() == ISD::FP_TO_UINT) {
|
|
SDOperand True, False;
|
|
MVT::ValueType VT = Node->getOperand(0).getValueType();
|
|
MVT::ValueType NVT = Node->getValueType(0);
|
|
unsigned ShiftAmt = MVT::getSizeInBits(Node->getValueType(0))-1;
|
|
Tmp2 = DAG.getConstantFP((double)(1ULL << ShiftAmt), VT);
|
|
Tmp3 = DAG.getSetCC(TLI.getSetCCResultTy(),
|
|
Node->getOperand(0), Tmp2, ISD::SETLT);
|
|
True = DAG.getNode(ISD::FP_TO_SINT, NVT, Node->getOperand(0));
|
|
False = DAG.getNode(ISD::FP_TO_SINT, NVT,
|
|
DAG.getNode(ISD::SUB, VT, Node->getOperand(0),
|
|
Tmp2));
|
|
False = DAG.getNode(ISD::XOR, NVT, False,
|
|
DAG.getConstant(1ULL << ShiftAmt, NVT));
|
|
Result = LegalizeOp(DAG.getNode(ISD::SELECT, NVT, Tmp3, True, False));
|
|
return Result;
|
|
} else {
|
|
assert(0 && "Do not know how to expand FP_TO_SINT yet!");
|
|
}
|
|
break;
|
|
case TargetLowering::Promote:
|
|
Result = PromoteLegalFP_TO_INT(Tmp1, Node->getValueType(0),
|
|
Node->getOpcode() == ISD::FP_TO_SINT);
|
|
AddLegalizedOperand(Op, Result);
|
|
return Result;
|
|
case TargetLowering::Custom: {
|
|
SDOperand Tmp =
|
|
DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
Tmp = TLI.LowerOperation(Tmp, DAG);
|
|
if (Tmp.Val) {
|
|
AddLegalizedOperand(Op, Tmp);
|
|
NeedsAnotherIteration = true;
|
|
return Tmp;
|
|
} else {
|
|
// The target thinks this is legal afterall.
|
|
break;
|
|
}
|
|
}
|
|
case TargetLowering::Legal:
|
|
break;
|
|
}
|
|
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
break;
|
|
case Expand:
|
|
assert(0 && "Shouldn't need to expand other operators here!");
|
|
case Promote:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(Node->getOpcode(), Op.getValueType(), Result);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::ANY_EXTEND:
|
|
case ISD::ZERO_EXTEND:
|
|
case ISD::SIGN_EXTEND:
|
|
case ISD::FP_EXTEND:
|
|
case ISD::FP_ROUND:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);
|
|
break;
|
|
case Expand:
|
|
assert(0 && "Shouldn't need to expand other operators here!");
|
|
|
|
case Promote:
|
|
switch (Node->getOpcode()) {
|
|
case ISD::ANY_EXTEND:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(ISD::ANY_EXTEND, Op.getValueType(), Result);
|
|
break;
|
|
case ISD::ZERO_EXTEND:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(ISD::ANY_EXTEND, Op.getValueType(), Result);
|
|
Result = DAG.getZeroExtendInReg(Result,
|
|
Node->getOperand(0).getValueType());
|
|
break;
|
|
case ISD::SIGN_EXTEND:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(ISD::ANY_EXTEND, Op.getValueType(), Result);
|
|
Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(),
|
|
Result,
|
|
DAG.getValueType(Node->getOperand(0).getValueType()));
|
|
break;
|
|
case ISD::FP_EXTEND:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
if (Result.getValueType() != Op.getValueType())
|
|
// Dynamically dead while we have only 2 FP types.
|
|
Result = DAG.getNode(ISD::FP_EXTEND, Op.getValueType(), Result);
|
|
break;
|
|
case ISD::FP_ROUND:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
Result = DAG.getNode(Node->getOpcode(), Op.getValueType(), Result);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case ISD::FP_ROUND_INREG:
|
|
case ISD::SIGN_EXTEND_INREG: {
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
MVT::ValueType ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
|
|
|
|
// If this operation is not supported, convert it to a shl/shr or load/store
|
|
// pair.
|
|
switch (TLI.getOperationAction(Node->getOpcode(), ExtraVT)) {
|
|
default: assert(0 && "This action not supported for this op yet!");
|
|
case TargetLowering::Legal:
|
|
if (Tmp1 != Node->getOperand(0))
|
|
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1,
|
|
DAG.getValueType(ExtraVT));
|
|
break;
|
|
case TargetLowering::Expand:
|
|
// If this is an integer extend and shifts are supported, do that.
|
|
if (Node->getOpcode() == ISD::SIGN_EXTEND_INREG) {
|
|
// NOTE: we could fall back on load/store here too for targets without
|
|
// SAR. However, it is doubtful that any exist.
|
|
unsigned BitsDiff = MVT::getSizeInBits(Node->getValueType(0)) -
|
|
MVT::getSizeInBits(ExtraVT);
|
|
SDOperand ShiftCst = DAG.getConstant(BitsDiff, TLI.getShiftAmountTy());
|
|
Result = DAG.getNode(ISD::SHL, Node->getValueType(0),
|
|
Node->getOperand(0), ShiftCst);
|
|
Result = DAG.getNode(ISD::SRA, Node->getValueType(0),
|
|
Result, ShiftCst);
|
|
} else if (Node->getOpcode() == ISD::FP_ROUND_INREG) {
|
|
// The only way we can lower this is to turn it into a STORETRUNC,
|
|
// EXTLOAD pair, targetting a temporary location (a stack slot).
|
|
|
|
// NOTE: there is a choice here between constantly creating new stack
|
|
// slots and always reusing the same one. We currently always create
|
|
// new ones, as reuse may inhibit scheduling.
|
|
const Type *Ty = MVT::getTypeForValueType(ExtraVT);
|
|
unsigned TySize = (unsigned)TLI.getTargetData().getTypeSize(Ty);
|
|
unsigned Align = TLI.getTargetData().getTypeAlignment(Ty);
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
int SSFI =
|
|
MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align);
|
|
SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
|
|
Result = DAG.getNode(ISD::TRUNCSTORE, MVT::Other, DAG.getEntryNode(),
|
|
Node->getOperand(0), StackSlot,
|
|
DAG.getSrcValue(NULL), DAG.getValueType(ExtraVT));
|
|
Result = DAG.getExtLoad(ISD::EXTLOAD, Node->getValueType(0),
|
|
Result, StackSlot, DAG.getSrcValue(NULL),
|
|
ExtraVT);
|
|
} else {
|
|
assert(0 && "Unknown op");
|
|
}
|
|
Result = LegalizeOp(Result);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Note that LegalizeOp may be reentered even from single-use nodes, which
|
|
// means that we always must cache transformed nodes.
|
|
AddLegalizedOperand(Op, Result);
|
|
return Result;
|
|
}
|
|
|
|
/// PromoteOp - Given an operation that produces a value in an invalid type,
|
|
/// promote it to compute the value into a larger type. The produced value will
|
|
/// have the correct bits for the low portion of the register, but no guarantee
|
|
/// is made about the top bits: it may be zero, sign-extended, or garbage.
|
|
SDOperand SelectionDAGLegalize::PromoteOp(SDOperand Op) {
|
|
MVT::ValueType VT = Op.getValueType();
|
|
MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
|
|
assert(getTypeAction(VT) == Promote &&
|
|
"Caller should expand or legalize operands that are not promotable!");
|
|
assert(NVT > VT && MVT::isInteger(NVT) == MVT::isInteger(VT) &&
|
|
"Cannot promote to smaller type!");
|
|
|
|
SDOperand Tmp1, Tmp2, Tmp3;
|
|
|
|
SDOperand Result;
|
|
SDNode *Node = Op.Val;
|
|
|
|
std::map<SDOperand, SDOperand>::iterator I = PromotedNodes.find(Op);
|
|
if (I != PromotedNodes.end()) return I->second;
|
|
|
|
// Promotion needs an optimization step to clean up after it, and is not
|
|
// careful to avoid operations the target does not support. Make sure that
|
|
// all generated operations are legalized in the next iteration.
|
|
NeedsAnotherIteration = true;
|
|
|
|
switch (Node->getOpcode()) {
|
|
case ISD::CopyFromReg:
|
|
assert(0 && "CopyFromReg must be legal!");
|
|
default:
|
|
std::cerr << "NODE: "; Node->dump(); std::cerr << "\n";
|
|
assert(0 && "Do not know how to promote this operator!");
|
|
abort();
|
|
case ISD::UNDEF:
|
|
Result = DAG.getNode(ISD::UNDEF, NVT);
|
|
break;
|
|
case ISD::Constant:
|
|
if (VT != MVT::i1)
|
|
Result = DAG.getNode(ISD::SIGN_EXTEND, NVT, Op);
|
|
else
|
|
Result = DAG.getNode(ISD::ZERO_EXTEND, NVT, Op);
|
|
assert(isa<ConstantSDNode>(Result) && "Didn't constant fold zext?");
|
|
break;
|
|
case ISD::ConstantFP:
|
|
Result = DAG.getNode(ISD::FP_EXTEND, NVT, Op);
|
|
assert(isa<ConstantFPSDNode>(Result) && "Didn't constant fold fp_extend?");
|
|
break;
|
|
|
|
case ISD::SETCC:
|
|
assert(isTypeLegal(TLI.getSetCCResultTy()) && "SetCC type is not legal??");
|
|
Result = DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(),Node->getOperand(0),
|
|
Node->getOperand(1), Node->getOperand(2));
|
|
Result = LegalizeOp(Result);
|
|
break;
|
|
|
|
case ISD::TRUNCATE:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Result = LegalizeOp(Node->getOperand(0));
|
|
assert(Result.getValueType() >= NVT &&
|
|
"This truncation doesn't make sense!");
|
|
if (Result.getValueType() > NVT) // Truncate to NVT instead of VT
|
|
Result = DAG.getNode(ISD::TRUNCATE, NVT, Result);
|
|
break;
|
|
case Promote:
|
|
// The truncation is not required, because we don't guarantee anything
|
|
// about high bits anyway.
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
break;
|
|
case Expand:
|
|
ExpandOp(Node->getOperand(0), Tmp1, Tmp2);
|
|
// Truncate the low part of the expanded value to the result type
|
|
Result = DAG.getNode(ISD::TRUNCATE, NVT, Tmp1);
|
|
}
|
|
break;
|
|
case ISD::SIGN_EXTEND:
|
|
case ISD::ZERO_EXTEND:
|
|
case ISD::ANY_EXTEND:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "BUG: Smaller reg should have been promoted!");
|
|
case Legal:
|
|
// Input is legal? Just do extend all the way to the larger type.
|
|
Result = LegalizeOp(Node->getOperand(0));
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Result);
|
|
break;
|
|
case Promote:
|
|
// Promote the reg if it's smaller.
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
// The high bits are not guaranteed to be anything. Insert an extend.
|
|
if (Node->getOpcode() == ISD::SIGN_EXTEND)
|
|
Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Result,
|
|
DAG.getValueType(Node->getOperand(0).getValueType()));
|
|
else if (Node->getOpcode() == ISD::ZERO_EXTEND)
|
|
Result = DAG.getZeroExtendInReg(Result,
|
|
Node->getOperand(0).getValueType());
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::FP_EXTEND:
|
|
assert(0 && "Case not implemented. Dynamically dead with 2 FP types!");
|
|
case ISD::FP_ROUND:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "BUG: Cannot expand FP regs!");
|
|
case Promote: assert(0 && "Unreachable with 2 FP types!");
|
|
case Legal:
|
|
// Input is legal? Do an FP_ROUND_INREG.
|
|
Result = LegalizeOp(Node->getOperand(0));
|
|
Result = DAG.getNode(ISD::FP_ROUND_INREG, NVT, Result,
|
|
DAG.getValueType(VT));
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::SINT_TO_FP:
|
|
case ISD::UINT_TO_FP:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Result = LegalizeOp(Node->getOperand(0));
|
|
// No extra round required here.
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Result);
|
|
break;
|
|
|
|
case Promote:
|
|
Result = PromoteOp(Node->getOperand(0));
|
|
if (Node->getOpcode() == ISD::SINT_TO_FP)
|
|
Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(),
|
|
Result,
|
|
DAG.getValueType(Node->getOperand(0).getValueType()));
|
|
else
|
|
Result = DAG.getZeroExtendInReg(Result,
|
|
Node->getOperand(0).getValueType());
|
|
// No extra round required here.
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Result);
|
|
break;
|
|
case Expand:
|
|
Result = ExpandIntToFP(Node->getOpcode() == ISD::SINT_TO_FP, NVT,
|
|
Node->getOperand(0));
|
|
// Round if we cannot tolerate excess precision.
|
|
if (NoExcessFPPrecision)
|
|
Result = DAG.getNode(ISD::FP_ROUND_INREG, NVT, Result,
|
|
DAG.getValueType(VT));
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ISD::FP_TO_SINT:
|
|
case ISD::FP_TO_UINT:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));
|
|
break;
|
|
case Promote:
|
|
// The input result is prerounded, so we don't have to do anything
|
|
// special.
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
break;
|
|
case Expand:
|
|
assert(0 && "not implemented");
|
|
}
|
|
// If we're promoting a UINT to a larger size, check to see if the new node
|
|
// will be legal. If it isn't, check to see if FP_TO_SINT is legal, since
|
|
// we can use that instead. This allows us to generate better code for
|
|
// FP_TO_UINT for small destination sizes on targets where FP_TO_UINT is not
|
|
// legal, such as PowerPC.
|
|
if (Node->getOpcode() == ISD::FP_TO_UINT &&
|
|
!TLI.isOperationLegal(ISD::FP_TO_UINT, NVT) &&
|
|
TLI.isOperationLegal(ISD::FP_TO_SINT, NVT)) {
|
|
Result = DAG.getNode(ISD::FP_TO_SINT, NVT, Tmp1);
|
|
} else {
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Tmp1);
|
|
}
|
|
break;
|
|
|
|
case ISD::FABS:
|
|
case ISD::FNEG:
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
assert(Tmp1.getValueType() == NVT);
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Tmp1);
|
|
// NOTE: we do not have to do any extra rounding here for
|
|
// NoExcessFPPrecision, because we know the input will have the appropriate
|
|
// precision, and these operations don't modify precision at all.
|
|
break;
|
|
|
|
case ISD::FSQRT:
|
|
case ISD::FSIN:
|
|
case ISD::FCOS:
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
assert(Tmp1.getValueType() == NVT);
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Tmp1);
|
|
if(NoExcessFPPrecision)
|
|
Result = DAG.getNode(ISD::FP_ROUND_INREG, NVT, Result,
|
|
DAG.getValueType(VT));
|
|
break;
|
|
|
|
case ISD::AND:
|
|
case ISD::OR:
|
|
case ISD::XOR:
|
|
case ISD::ADD:
|
|
case ISD::SUB:
|
|
case ISD::MUL:
|
|
// The input may have strange things in the top bits of the registers, but
|
|
// these operations don't care. They may have wierd bits going out, but
|
|
// that too is okay if they are integer operations.
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
Tmp2 = PromoteOp(Node->getOperand(1));
|
|
assert(Tmp1.getValueType() == NVT && Tmp2.getValueType() == NVT);
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Tmp1, Tmp2);
|
|
|
|
// However, if this is a floating point operation, they will give excess
|
|
// precision that we may not be able to tolerate. If we DO allow excess
|
|
// precision, just leave it, otherwise excise it.
|
|
// FIXME: Why would we need to round FP ops more than integer ones?
|
|
// Is Round(Add(Add(A,B),C)) != Round(Add(Round(Add(A,B)), C))
|
|
if (MVT::isFloatingPoint(NVT) && NoExcessFPPrecision)
|
|
Result = DAG.getNode(ISD::FP_ROUND_INREG, NVT, Result,
|
|
DAG.getValueType(VT));
|
|
break;
|
|
|
|
case ISD::SDIV:
|
|
case ISD::SREM:
|
|
// These operators require that their input be sign extended.
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
Tmp2 = PromoteOp(Node->getOperand(1));
|
|
if (MVT::isInteger(NVT)) {
|
|
Tmp1 = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Tmp1,
|
|
DAG.getValueType(VT));
|
|
Tmp2 = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Tmp2,
|
|
DAG.getValueType(VT));
|
|
}
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Tmp1, Tmp2);
|
|
|
|
// Perform FP_ROUND: this is probably overly pessimistic.
|
|
if (MVT::isFloatingPoint(NVT) && NoExcessFPPrecision)
|
|
Result = DAG.getNode(ISD::FP_ROUND_INREG, NVT, Result,
|
|
DAG.getValueType(VT));
|
|
break;
|
|
|
|
case ISD::UDIV:
|
|
case ISD::UREM:
|
|
// These operators require that their input be zero extended.
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
Tmp2 = PromoteOp(Node->getOperand(1));
|
|
assert(MVT::isInteger(NVT) && "Operators don't apply to FP!");
|
|
Tmp1 = DAG.getZeroExtendInReg(Tmp1, VT);
|
|
Tmp2 = DAG.getZeroExtendInReg(Tmp2, VT);
|
|
Result = DAG.getNode(Node->getOpcode(), NVT, Tmp1, Tmp2);
|
|
break;
|
|
|
|
case ISD::SHL:
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
Result = DAG.getNode(ISD::SHL, NVT, Tmp1, Tmp2);
|
|
break;
|
|
case ISD::SRA:
|
|
// The input value must be properly sign extended.
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
Tmp1 = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Tmp1,
|
|
DAG.getValueType(VT));
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
Result = DAG.getNode(ISD::SRA, NVT, Tmp1, Tmp2);
|
|
break;
|
|
case ISD::SRL:
|
|
// The input value must be properly zero extended.
|
|
Tmp1 = PromoteOp(Node->getOperand(0));
|
|
Tmp1 = DAG.getZeroExtendInReg(Tmp1, VT);
|
|
Tmp2 = LegalizeOp(Node->getOperand(1));
|
|
Result = DAG.getNode(ISD::SRL, NVT, Tmp1, Tmp2);
|
|
break;
|
|
case ISD::LOAD:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the pointer.
|
|
// FIXME: When the DAG combiner exists, change this to use EXTLOAD!
|
|
if (MVT::isInteger(NVT))
|
|
Result = DAG.getExtLoad(ISD::ZEXTLOAD, NVT, Tmp1, Tmp2,
|
|
Node->getOperand(2), VT);
|
|
else
|
|
Result = DAG.getExtLoad(ISD::EXTLOAD, NVT, Tmp1, Tmp2,
|
|
Node->getOperand(2), VT);
|
|
|
|
// Remember that we legalized the chain.
|
|
AddLegalizedOperand(Op.getValue(1), Result.getValue(1));
|
|
break;
|
|
case ISD::SELECT:
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "It's impossible to expand bools");
|
|
case Legal:
|
|
Tmp1 = LegalizeOp(Node->getOperand(0));// Legalize the condition.
|
|
break;
|
|
case Promote:
|
|
Tmp1 = PromoteOp(Node->getOperand(0)); // Promote the condition.
|
|
break;
|
|
}
|
|
Tmp2 = PromoteOp(Node->getOperand(1)); // Legalize the op0
|
|
Tmp3 = PromoteOp(Node->getOperand(2)); // Legalize the op1
|
|
Result = DAG.getNode(ISD::SELECT, NVT, Tmp1, Tmp2, Tmp3);
|
|
break;
|
|
case ISD::SELECT_CC:
|
|
Tmp2 = PromoteOp(Node->getOperand(2)); // True
|
|
Tmp3 = PromoteOp(Node->getOperand(3)); // False
|
|
Result = DAG.getNode(ISD::SELECT_CC, NVT, Node->getOperand(0),
|
|
Node->getOperand(1), Tmp2, Tmp3,
|
|
Node->getOperand(4));
|
|
break;
|
|
case ISD::TAILCALL:
|
|
case ISD::CALL: {
|
|
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the callee.
|
|
|
|
std::vector<SDOperand> Ops;
|
|
for (unsigned i = 2, e = Node->getNumOperands(); i != e; ++i)
|
|
Ops.push_back(LegalizeOp(Node->getOperand(i)));
|
|
|
|
assert(Node->getNumValues() == 2 && Op.ResNo == 0 &&
|
|
"Can only promote single result calls");
|
|
std::vector<MVT::ValueType> RetTyVTs;
|
|
RetTyVTs.reserve(2);
|
|
RetTyVTs.push_back(NVT);
|
|
RetTyVTs.push_back(MVT::Other);
|
|
SDNode *NC = DAG.getCall(RetTyVTs, Tmp1, Tmp2, Ops,
|
|
Node->getOpcode() == ISD::TAILCALL);
|
|
Result = SDOperand(NC, 0);
|
|
|
|
// Insert the new chain mapping.
|
|
AddLegalizedOperand(Op.getValue(1), Result.getValue(1));
|
|
break;
|
|
}
|
|
case ISD::CTPOP:
|
|
case ISD::CTTZ:
|
|
case ISD::CTLZ:
|
|
Tmp1 = Node->getOperand(0);
|
|
//Zero extend the argument
|
|
Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, NVT, Tmp1);
|
|
// Perform the larger operation, then subtract if needed.
|
|
Tmp1 = DAG.getNode(Node->getOpcode(), NVT, Tmp1);
|
|
switch(Node->getOpcode())
|
|
{
|
|
case ISD::CTPOP:
|
|
Result = Tmp1;
|
|
break;
|
|
case ISD::CTTZ:
|
|
//if Tmp1 == sizeinbits(NVT) then Tmp1 = sizeinbits(Old VT)
|
|
Tmp2 = DAG.getSetCC(TLI.getSetCCResultTy(), Tmp1,
|
|
DAG.getConstant(getSizeInBits(NVT), NVT), ISD::SETEQ);
|
|
Result = DAG.getNode(ISD::SELECT, NVT, Tmp2,
|
|
DAG.getConstant(getSizeInBits(VT),NVT), Tmp1);
|
|
break;
|
|
case ISD::CTLZ:
|
|
//Tmp1 = Tmp1 - (sizeinbits(NVT) - sizeinbits(Old VT))
|
|
Result = DAG.getNode(ISD::SUB, NVT, Tmp1,
|
|
DAG.getConstant(getSizeInBits(NVT) -
|
|
getSizeInBits(VT), NVT));
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
assert(Result.Val && "Didn't set a result!");
|
|
AddPromotedOperand(Op, Result);
|
|
return Result;
|
|
}
|
|
|
|
/// ExpandAddSub - Find a clever way to expand this add operation into
|
|
/// subcomponents.
|
|
void SelectionDAGLegalize::
|
|
ExpandByParts(unsigned NodeOp, SDOperand LHS, SDOperand RHS,
|
|
SDOperand &Lo, SDOperand &Hi) {
|
|
// Expand the subcomponents.
|
|
SDOperand LHSL, LHSH, RHSL, RHSH;
|
|
ExpandOp(LHS, LHSL, LHSH);
|
|
ExpandOp(RHS, RHSL, RHSH);
|
|
|
|
// FIXME: this should be moved to the dag combiner someday.
|
|
assert(NodeOp == ISD::ADD_PARTS || NodeOp == ISD::SUB_PARTS);
|
|
if (LHSL.getValueType() == MVT::i32) {
|
|
SDOperand LowEl;
|
|
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(LHSL))
|
|
if (C->getValue() == 0)
|
|
LowEl = RHSL;
|
|
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHSL))
|
|
if (C->getValue() == 0)
|
|
LowEl = LHSL;
|
|
if (LowEl.Val) {
|
|
// Turn this into an add/sub of the high part only.
|
|
SDOperand HiEl =
|
|
DAG.getNode(NodeOp == ISD::ADD_PARTS ? ISD::ADD : ISD::SUB,
|
|
LowEl.getValueType(), LHSH, RHSH);
|
|
Lo = LowEl;
|
|
Hi = HiEl;
|
|
return;
|
|
}
|
|
}
|
|
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(LHSL);
|
|
Ops.push_back(LHSH);
|
|
Ops.push_back(RHSL);
|
|
Ops.push_back(RHSH);
|
|
|
|
std::vector<MVT::ValueType> VTs(2, LHSL.getValueType());
|
|
Lo = DAG.getNode(NodeOp, VTs, Ops);
|
|
Hi = Lo.getValue(1);
|
|
}
|
|
|
|
void SelectionDAGLegalize::ExpandShiftParts(unsigned NodeOp,
|
|
SDOperand Op, SDOperand Amt,
|
|
SDOperand &Lo, SDOperand &Hi) {
|
|
// Expand the subcomponents.
|
|
SDOperand LHSL, LHSH;
|
|
ExpandOp(Op, LHSL, LHSH);
|
|
|
|
std::vector<SDOperand> Ops;
|
|
Ops.push_back(LHSL);
|
|
Ops.push_back(LHSH);
|
|
Ops.push_back(Amt);
|
|
std::vector<MVT::ValueType> VTs(2, LHSL.getValueType());
|
|
Lo = DAG.getNode(NodeOp, VTs, Ops);
|
|
Hi = Lo.getValue(1);
|
|
}
|
|
|
|
|
|
/// ExpandShift - Try to find a clever way to expand this shift operation out to
|
|
/// smaller elements. If we can't find a way that is more efficient than a
|
|
/// libcall on this target, return false. Otherwise, return true with the
|
|
/// low-parts expanded into Lo and Hi.
|
|
bool SelectionDAGLegalize::ExpandShift(unsigned Opc, SDOperand Op,SDOperand Amt,
|
|
SDOperand &Lo, SDOperand &Hi) {
|
|
assert((Opc == ISD::SHL || Opc == ISD::SRA || Opc == ISD::SRL) &&
|
|
"This is not a shift!");
|
|
|
|
MVT::ValueType NVT = TLI.getTypeToTransformTo(Op.getValueType());
|
|
SDOperand ShAmt = LegalizeOp(Amt);
|
|
MVT::ValueType ShTy = ShAmt.getValueType();
|
|
unsigned VTBits = MVT::getSizeInBits(Op.getValueType());
|
|
unsigned NVTBits = MVT::getSizeInBits(NVT);
|
|
|
|
// Handle the case when Amt is an immediate. Other cases are currently broken
|
|
// and are disabled.
|
|
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Amt.Val)) {
|
|
unsigned Cst = CN->getValue();
|
|
// Expand the incoming operand to be shifted, so that we have its parts
|
|
SDOperand InL, InH;
|
|
ExpandOp(Op, InL, InH);
|
|
switch(Opc) {
|
|
case ISD::SHL:
|
|
if (Cst > VTBits) {
|
|
Lo = DAG.getConstant(0, NVT);
|
|
Hi = DAG.getConstant(0, NVT);
|
|
} else if (Cst > NVTBits) {
|
|
Lo = DAG.getConstant(0, NVT);
|
|
Hi = DAG.getNode(ISD::SHL, NVT, InL, DAG.getConstant(Cst-NVTBits,ShTy));
|
|
} else if (Cst == NVTBits) {
|
|
Lo = DAG.getConstant(0, NVT);
|
|
Hi = InL;
|
|
} else {
|
|
Lo = DAG.getNode(ISD::SHL, NVT, InL, DAG.getConstant(Cst, ShTy));
|
|
Hi = DAG.getNode(ISD::OR, NVT,
|
|
DAG.getNode(ISD::SHL, NVT, InH, DAG.getConstant(Cst, ShTy)),
|
|
DAG.getNode(ISD::SRL, NVT, InL, DAG.getConstant(NVTBits-Cst, ShTy)));
|
|
}
|
|
return true;
|
|
case ISD::SRL:
|
|
if (Cst > VTBits) {
|
|
Lo = DAG.getConstant(0, NVT);
|
|
Hi = DAG.getConstant(0, NVT);
|
|
} else if (Cst > NVTBits) {
|
|
Lo = DAG.getNode(ISD::SRL, NVT, InH, DAG.getConstant(Cst-NVTBits,ShTy));
|
|
Hi = DAG.getConstant(0, NVT);
|
|
} else if (Cst == NVTBits) {
|
|
Lo = InH;
|
|
Hi = DAG.getConstant(0, NVT);
|
|
} else {
|
|
Lo = DAG.getNode(ISD::OR, NVT,
|
|
DAG.getNode(ISD::SRL, NVT, InL, DAG.getConstant(Cst, ShTy)),
|
|
DAG.getNode(ISD::SHL, NVT, InH, DAG.getConstant(NVTBits-Cst, ShTy)));
|
|
Hi = DAG.getNode(ISD::SRL, NVT, InH, DAG.getConstant(Cst, ShTy));
|
|
}
|
|
return true;
|
|
case ISD::SRA:
|
|
if (Cst > VTBits) {
|
|
Hi = Lo = DAG.getNode(ISD::SRA, NVT, InH,
|
|
DAG.getConstant(NVTBits-1, ShTy));
|
|
} else if (Cst > NVTBits) {
|
|
Lo = DAG.getNode(ISD::SRA, NVT, InH,
|
|
DAG.getConstant(Cst-NVTBits, ShTy));
|
|
Hi = DAG.getNode(ISD::SRA, NVT, InH,
|
|
DAG.getConstant(NVTBits-1, ShTy));
|
|
} else if (Cst == NVTBits) {
|
|
Lo = InH;
|
|
Hi = DAG.getNode(ISD::SRA, NVT, InH,
|
|
DAG.getConstant(NVTBits-1, ShTy));
|
|
} else {
|
|
Lo = DAG.getNode(ISD::OR, NVT,
|
|
DAG.getNode(ISD::SRL, NVT, InL, DAG.getConstant(Cst, ShTy)),
|
|
DAG.getNode(ISD::SHL, NVT, InH, DAG.getConstant(NVTBits-Cst, ShTy)));
|
|
Hi = DAG.getNode(ISD::SRA, NVT, InH, DAG.getConstant(Cst, ShTy));
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
// FIXME: The following code for expanding shifts using ISD::SELECT is buggy,
|
|
// so disable it for now. Currently targets are handling this via SHL_PARTS
|
|
// and friends.
|
|
return false;
|
|
|
|
// If we have an efficient select operation (or if the selects will all fold
|
|
// away), lower to some complex code, otherwise just emit the libcall.
|
|
if (!TLI.isOperationLegal(ISD::SELECT, NVT) && !isa<ConstantSDNode>(Amt))
|
|
return false;
|
|
|
|
SDOperand InL, InH;
|
|
ExpandOp(Op, InL, InH);
|
|
SDOperand NAmt = DAG.getNode(ISD::SUB, ShTy, // NAmt = 32-ShAmt
|
|
DAG.getConstant(NVTBits, ShTy), ShAmt);
|
|
|
|
// Compare the unmasked shift amount against 32.
|
|
SDOperand Cond = DAG.getSetCC(TLI.getSetCCResultTy(), ShAmt,
|
|
DAG.getConstant(NVTBits, ShTy), ISD::SETGE);
|
|
|
|
if (TLI.getShiftAmountFlavor() != TargetLowering::Mask) {
|
|
ShAmt = DAG.getNode(ISD::AND, ShTy, ShAmt, // ShAmt &= 31
|
|
DAG.getConstant(NVTBits-1, ShTy));
|
|
NAmt = DAG.getNode(ISD::AND, ShTy, NAmt, // NAmt &= 31
|
|
DAG.getConstant(NVTBits-1, ShTy));
|
|
}
|
|
|
|
if (Opc == ISD::SHL) {
|
|
SDOperand T1 = DAG.getNode(ISD::OR, NVT,// T1 = (Hi << Amt) | (Lo >> NAmt)
|
|
DAG.getNode(ISD::SHL, NVT, InH, ShAmt),
|
|
DAG.getNode(ISD::SRL, NVT, InL, NAmt));
|
|
SDOperand T2 = DAG.getNode(ISD::SHL, NVT, InL, ShAmt); // T2 = Lo << Amt&31
|
|
|
|
Hi = DAG.getNode(ISD::SELECT, NVT, Cond, T2, T1);
|
|
Lo = DAG.getNode(ISD::SELECT, NVT, Cond, DAG.getConstant(0, NVT), T2);
|
|
} else {
|
|
SDOperand HiLoPart = DAG.getNode(ISD::SELECT, NVT,
|
|
DAG.getSetCC(TLI.getSetCCResultTy(), NAmt,
|
|
DAG.getConstant(32, ShTy),
|
|
ISD::SETEQ),
|
|
DAG.getConstant(0, NVT),
|
|
DAG.getNode(ISD::SHL, NVT, InH, NAmt));
|
|
SDOperand T1 = DAG.getNode(ISD::OR, NVT,// T1 = (Hi << NAmt) | (Lo >> Amt)
|
|
HiLoPart,
|
|
DAG.getNode(ISD::SRL, NVT, InL, ShAmt));
|
|
SDOperand T2 = DAG.getNode(Opc, NVT, InH, ShAmt); // T2 = InH >> ShAmt&31
|
|
|
|
SDOperand HiPart;
|
|
if (Opc == ISD::SRA)
|
|
HiPart = DAG.getNode(ISD::SRA, NVT, InH,
|
|
DAG.getConstant(NVTBits-1, ShTy));
|
|
else
|
|
HiPart = DAG.getConstant(0, NVT);
|
|
Lo = DAG.getNode(ISD::SELECT, NVT, Cond, T2, T1);
|
|
Hi = DAG.getNode(ISD::SELECT, NVT, Cond, HiPart, T2);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// FindLatestCallSeqStart - Scan up the dag to find the latest (highest
|
|
/// NodeDepth) node that is an CallSeqStart operation and occurs later than
|
|
/// Found.
|
|
static void FindLatestCallSeqStart(SDNode *Node, SDNode *&Found) {
|
|
if (Node->getNodeDepth() <= Found->getNodeDepth()) return;
|
|
|
|
// If we found an CALLSEQ_START, we already know this node occurs later
|
|
// than the Found node. Just remember this node and return.
|
|
if (Node->getOpcode() == ISD::CALLSEQ_START) {
|
|
Found = Node;
|
|
return;
|
|
}
|
|
|
|
// Otherwise, scan the operands of Node to see if any of them is a call.
|
|
assert(Node->getNumOperands() != 0 &&
|
|
"All leaves should have depth equal to the entry node!");
|
|
for (unsigned i = 0, e = Node->getNumOperands()-1; i != e; ++i)
|
|
FindLatestCallSeqStart(Node->getOperand(i).Val, Found);
|
|
|
|
// Tail recurse for the last iteration.
|
|
FindLatestCallSeqStart(Node->getOperand(Node->getNumOperands()-1).Val,
|
|
Found);
|
|
}
|
|
|
|
|
|
/// FindEarliestCallSeqEnd - Scan down the dag to find the earliest (lowest
|
|
/// NodeDepth) node that is an CallSeqEnd operation and occurs more recent
|
|
/// than Found.
|
|
static void FindEarliestCallSeqEnd(SDNode *Node, SDNode *&Found,
|
|
std::set<SDNode*> &Visited) {
|
|
if ((Found && Node->getNodeDepth() >= Found->getNodeDepth()) ||
|
|
!Visited.insert(Node).second) return;
|
|
|
|
// If we found an CALLSEQ_END, we already know this node occurs earlier
|
|
// than the Found node. Just remember this node and return.
|
|
if (Node->getOpcode() == ISD::CALLSEQ_END) {
|
|
Found = Node;
|
|
return;
|
|
}
|
|
|
|
// Otherwise, scan the operands of Node to see if any of them is a call.
|
|
SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
|
|
if (UI == E) return;
|
|
for (--E; UI != E; ++UI)
|
|
FindEarliestCallSeqEnd(*UI, Found, Visited);
|
|
|
|
// Tail recurse for the last iteration.
|
|
FindEarliestCallSeqEnd(*UI, Found, Visited);
|
|
}
|
|
|
|
/// FindCallSeqEnd - Given a chained node that is part of a call sequence,
|
|
/// find the CALLSEQ_END node that terminates the call sequence.
|
|
static SDNode *FindCallSeqEnd(SDNode *Node) {
|
|
if (Node->getOpcode() == ISD::CALLSEQ_END)
|
|
return Node;
|
|
if (Node->use_empty())
|
|
return 0; // No CallSeqEnd
|
|
|
|
if (Node->hasOneUse()) // Simple case, only has one user to check.
|
|
return FindCallSeqEnd(*Node->use_begin());
|
|
|
|
SDOperand TheChain(Node, Node->getNumValues()-1);
|
|
if (TheChain.getValueType() != MVT::Other)
|
|
TheChain = SDOperand(Node, 0);
|
|
assert(TheChain.getValueType() == MVT::Other && "Is not a token chain!");
|
|
|
|
for (SDNode::use_iterator UI = Node->use_begin(),
|
|
E = Node->use_end(); UI != E; ++UI) {
|
|
|
|
// Make sure to only follow users of our token chain.
|
|
SDNode *User = *UI;
|
|
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i)
|
|
if (User->getOperand(i) == TheChain)
|
|
if (SDNode *Result = FindCallSeqEnd(User))
|
|
return Result;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/// FindCallSeqStart - Given a chained node that is part of a call sequence,
|
|
/// find the CALLSEQ_START node that initiates the call sequence.
|
|
static SDNode *FindCallSeqStart(SDNode *Node) {
|
|
assert(Node && "Didn't find callseq_start for a call??");
|
|
if (Node->getOpcode() == ISD::CALLSEQ_START) return Node;
|
|
|
|
assert(Node->getOperand(0).getValueType() == MVT::Other &&
|
|
"Node doesn't have a token chain argument!");
|
|
return FindCallSeqStart(Node->getOperand(0).Val);
|
|
}
|
|
|
|
|
|
/// FindInputOutputChains - If we are replacing an operation with a call we need
|
|
/// to find the call that occurs before and the call that occurs after it to
|
|
/// properly serialize the calls in the block. The returned operand is the
|
|
/// input chain value for the new call (e.g. the entry node or the previous
|
|
/// call), and OutChain is set to be the chain node to update to point to the
|
|
/// end of the call chain.
|
|
static SDOperand FindInputOutputChains(SDNode *OpNode, SDNode *&OutChain,
|
|
SDOperand Entry) {
|
|
SDNode *LatestCallSeqStart = Entry.Val;
|
|
SDNode *LatestCallSeqEnd = 0;
|
|
FindLatestCallSeqStart(OpNode, LatestCallSeqStart);
|
|
//std::cerr<<"Found node: "; LatestCallSeqStart->dump(); std::cerr <<"\n";
|
|
|
|
// It is possible that no ISD::CALLSEQ_START was found because there is no
|
|
// previous call in the function. LatestCallStackDown may in that case be
|
|
// the entry node itself. Do not attempt to find a matching CALLSEQ_END
|
|
// unless LatestCallStackDown is an CALLSEQ_START.
|
|
if (LatestCallSeqStart->getOpcode() == ISD::CALLSEQ_START)
|
|
LatestCallSeqEnd = FindCallSeqEnd(LatestCallSeqStart);
|
|
else
|
|
LatestCallSeqEnd = Entry.Val;
|
|
assert(LatestCallSeqEnd && "NULL return from FindCallSeqEnd");
|
|
|
|
// Finally, find the first call that this must come before, first we find the
|
|
// CallSeqEnd that ends the call.
|
|
OutChain = 0;
|
|
std::set<SDNode*> Visited;
|
|
FindEarliestCallSeqEnd(OpNode, OutChain, Visited);
|
|
|
|
// If we found one, translate from the adj up to the callseq_start.
|
|
if (OutChain)
|
|
OutChain = FindCallSeqStart(OutChain);
|
|
|
|
return SDOperand(LatestCallSeqEnd, 0);
|
|
}
|
|
|
|
/// SpliceCallInto - Given the result chain of a libcall (CallResult), and a
|
|
void SelectionDAGLegalize::SpliceCallInto(const SDOperand &CallResult,
|
|
SDNode *OutChain) {
|
|
// Nothing to splice it into?
|
|
if (OutChain == 0) return;
|
|
|
|
assert(OutChain->getOperand(0).getValueType() == MVT::Other);
|
|
//OutChain->dump();
|
|
|
|
// Form a token factor node merging the old inval and the new inval.
|
|
SDOperand InToken = DAG.getNode(ISD::TokenFactor, MVT::Other, CallResult,
|
|
OutChain->getOperand(0));
|
|
// Change the node to refer to the new token.
|
|
OutChain->setAdjCallChain(InToken);
|
|
}
|
|
|
|
|
|
// ExpandLibCall - Expand a node into a call to a libcall. If the result value
|
|
// does not fit into a register, return the lo part and set the hi part to the
|
|
// by-reg argument. If it does fit into a single register, return the result
|
|
// and leave the Hi part unset.
|
|
SDOperand SelectionDAGLegalize::ExpandLibCall(const char *Name, SDNode *Node,
|
|
SDOperand &Hi) {
|
|
SDNode *OutChain;
|
|
SDOperand InChain = FindInputOutputChains(Node, OutChain,
|
|
DAG.getEntryNode());
|
|
if (InChain.Val == 0)
|
|
InChain = DAG.getEntryNode();
|
|
|
|
TargetLowering::ArgListTy Args;
|
|
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
|
|
MVT::ValueType ArgVT = Node->getOperand(i).getValueType();
|
|
const Type *ArgTy = MVT::getTypeForValueType(ArgVT);
|
|
Args.push_back(std::make_pair(Node->getOperand(i), ArgTy));
|
|
}
|
|
SDOperand Callee = DAG.getExternalSymbol(Name, TLI.getPointerTy());
|
|
|
|
// Splice the libcall in wherever FindInputOutputChains tells us to.
|
|
const Type *RetTy = MVT::getTypeForValueType(Node->getValueType(0));
|
|
std::pair<SDOperand,SDOperand> CallInfo =
|
|
TLI.LowerCallTo(InChain, RetTy, false, CallingConv::C, false,
|
|
Callee, Args, DAG);
|
|
|
|
SDOperand Result;
|
|
switch (getTypeAction(CallInfo.first.getValueType())) {
|
|
default: assert(0 && "Unknown thing");
|
|
case Legal:
|
|
Result = CallInfo.first;
|
|
break;
|
|
case Promote:
|
|
assert(0 && "Cannot promote this yet!");
|
|
case Expand:
|
|
ExpandOp(CallInfo.first, Result, Hi);
|
|
CallInfo.second = LegalizeOp(CallInfo.second);
|
|
break;
|
|
}
|
|
|
|
SpliceCallInto(CallInfo.second, OutChain);
|
|
NeedsAnotherIteration = true;
|
|
return Result;
|
|
}
|
|
|
|
|
|
/// ExpandIntToFP - Expand a [US]INT_TO_FP operation, assuming that the
|
|
/// destination type is legal.
|
|
SDOperand SelectionDAGLegalize::
|
|
ExpandIntToFP(bool isSigned, MVT::ValueType DestTy, SDOperand Source) {
|
|
assert(isTypeLegal(DestTy) && "Destination type is not legal!");
|
|
assert(getTypeAction(Source.getValueType()) == Expand &&
|
|
"This is not an expansion!");
|
|
assert(Source.getValueType() == MVT::i64 && "Only handle expand from i64!");
|
|
|
|
if (!isSigned) {
|
|
assert(Source.getValueType() == MVT::i64 &&
|
|
"This only works for 64-bit -> FP");
|
|
// The 64-bit value loaded will be incorrectly if the 'sign bit' of the
|
|
// incoming integer is set. To handle this, we dynamically test to see if
|
|
// it is set, and, if so, add a fudge factor.
|
|
SDOperand Lo, Hi;
|
|
ExpandOp(Source, Lo, Hi);
|
|
|
|
// If this is unsigned, and not supported, first perform the conversion to
|
|
// signed, then adjust the result if the sign bit is set.
|
|
SDOperand SignedConv = ExpandIntToFP(true, DestTy,
|
|
DAG.getNode(ISD::BUILD_PAIR, Source.getValueType(), Lo, Hi));
|
|
|
|
SDOperand SignSet = DAG.getSetCC(TLI.getSetCCResultTy(), Hi,
|
|
DAG.getConstant(0, Hi.getValueType()),
|
|
ISD::SETLT);
|
|
SDOperand Zero = getIntPtrConstant(0), Four = getIntPtrConstant(4);
|
|
SDOperand CstOffset = DAG.getNode(ISD::SELECT, Zero.getValueType(),
|
|
SignSet, Four, Zero);
|
|
uint64_t FF = 0x5f800000ULL;
|
|
if (TLI.isLittleEndian()) FF <<= 32;
|
|
static Constant *FudgeFactor = ConstantUInt::get(Type::ULongTy, FF);
|
|
|
|
SDOperand CPIdx = DAG.getConstantPool(FudgeFactor, TLI.getPointerTy());
|
|
CPIdx = DAG.getNode(ISD::ADD, TLI.getPointerTy(), CPIdx, CstOffset);
|
|
SDOperand FudgeInReg;
|
|
if (DestTy == MVT::f32)
|
|
FudgeInReg = DAG.getLoad(MVT::f32, DAG.getEntryNode(), CPIdx,
|
|
DAG.getSrcValue(NULL));
|
|
else {
|
|
assert(DestTy == MVT::f64 && "Unexpected conversion");
|
|
FudgeInReg = DAG.getExtLoad(ISD::EXTLOAD, MVT::f64, DAG.getEntryNode(),
|
|
CPIdx, DAG.getSrcValue(NULL), MVT::f32);
|
|
}
|
|
return DAG.getNode(ISD::ADD, DestTy, SignedConv, FudgeInReg);
|
|
}
|
|
|
|
// Check to see if the target has a custom way to lower this. If so, use it.
|
|
switch (TLI.getOperationAction(ISD::SINT_TO_FP, Source.getValueType())) {
|
|
default: assert(0 && "This action not implemented for this operation!");
|
|
case TargetLowering::Legal:
|
|
case TargetLowering::Expand:
|
|
break; // This case is handled below.
|
|
case TargetLowering::Custom: {
|
|
SDOperand NV = TLI.LowerOperation(DAG.getNode(ISD::SINT_TO_FP, DestTy,
|
|
Source), DAG);
|
|
if (NV.Val)
|
|
return LegalizeOp(NV);
|
|
break; // The target decided this was legal after all
|
|
}
|
|
}
|
|
|
|
// Expand the source, then glue it back together for the call. We must expand
|
|
// the source in case it is shared (this pass of legalize must traverse it).
|
|
SDOperand SrcLo, SrcHi;
|
|
ExpandOp(Source, SrcLo, SrcHi);
|
|
Source = DAG.getNode(ISD::BUILD_PAIR, Source.getValueType(), SrcLo, SrcHi);
|
|
|
|
SDNode *OutChain = 0;
|
|
SDOperand InChain = FindInputOutputChains(Source.Val, OutChain,
|
|
DAG.getEntryNode());
|
|
const char *FnName = 0;
|
|
if (DestTy == MVT::f32)
|
|
FnName = "__floatdisf";
|
|
else {
|
|
assert(DestTy == MVT::f64 && "Unknown fp value type!");
|
|
FnName = "__floatdidf";
|
|
}
|
|
|
|
SDOperand Callee = DAG.getExternalSymbol(FnName, TLI.getPointerTy());
|
|
|
|
TargetLowering::ArgListTy Args;
|
|
const Type *ArgTy = MVT::getTypeForValueType(Source.getValueType());
|
|
|
|
Args.push_back(std::make_pair(Source, ArgTy));
|
|
|
|
// We don't care about token chains for libcalls. We just use the entry
|
|
// node as our input and ignore the output chain. This allows us to place
|
|
// calls wherever we need them to satisfy data dependences.
|
|
const Type *RetTy = MVT::getTypeForValueType(DestTy);
|
|
|
|
std::pair<SDOperand,SDOperand> CallResult =
|
|
TLI.LowerCallTo(InChain, RetTy, false, CallingConv::C, true,
|
|
Callee, Args, DAG);
|
|
|
|
SpliceCallInto(CallResult.second, OutChain);
|
|
return CallResult.first;
|
|
}
|
|
|
|
|
|
|
|
/// ExpandOp - Expand the specified SDOperand into its two component pieces
|
|
/// Lo&Hi. Note that the Op MUST be an expanded type. As a result of this, the
|
|
/// LegalizeNodes map is filled in for any results that are not expanded, the
|
|
/// ExpandedNodes map is filled in for any results that are expanded, and the
|
|
/// Lo/Hi values are returned.
|
|
void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
|
|
MVT::ValueType VT = Op.getValueType();
|
|
MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
|
|
SDNode *Node = Op.Val;
|
|
assert(getTypeAction(VT) == Expand && "Not an expanded type!");
|
|
assert(MVT::isInteger(VT) && "Cannot expand FP values!");
|
|
assert(MVT::isInteger(NVT) && NVT < VT &&
|
|
"Cannot expand to FP value or to larger int value!");
|
|
|
|
// See if we already expanded it.
|
|
std::map<SDOperand, std::pair<SDOperand, SDOperand> >::iterator I
|
|
= ExpandedNodes.find(Op);
|
|
if (I != ExpandedNodes.end()) {
|
|
Lo = I->second.first;
|
|
Hi = I->second.second;
|
|
return;
|
|
}
|
|
|
|
// Expanding to multiple registers needs to perform an optimization step, and
|
|
// is not careful to avoid operations the target does not support. Make sure
|
|
// that all generated operations are legalized in the next iteration.
|
|
NeedsAnotherIteration = true;
|
|
|
|
switch (Node->getOpcode()) {
|
|
case ISD::CopyFromReg:
|
|
assert(0 && "CopyFromReg must be legal!");
|
|
default:
|
|
std::cerr << "NODE: "; Node->dump(); std::cerr << "\n";
|
|
assert(0 && "Do not know how to expand this operator!");
|
|
abort();
|
|
case ISD::UNDEF:
|
|
Lo = DAG.getNode(ISD::UNDEF, NVT);
|
|
Hi = DAG.getNode(ISD::UNDEF, NVT);
|
|
break;
|
|
case ISD::Constant: {
|
|
uint64_t Cst = cast<ConstantSDNode>(Node)->getValue();
|
|
Lo = DAG.getConstant(Cst, NVT);
|
|
Hi = DAG.getConstant(Cst >> MVT::getSizeInBits(NVT), NVT);
|
|
break;
|
|
}
|
|
|
|
case ISD::BUILD_PAIR:
|
|
// Legalize both operands. FIXME: in the future we should handle the case
|
|
// where the two elements are not legal.
|
|
assert(isTypeLegal(NVT) && "Cannot expand this multiple times yet!");
|
|
Lo = LegalizeOp(Node->getOperand(0));
|
|
Hi = LegalizeOp(Node->getOperand(1));
|
|
break;
|
|
|
|
case ISD::CTPOP:
|
|
ExpandOp(Node->getOperand(0), Lo, Hi);
|
|
Lo = DAG.getNode(ISD::ADD, NVT, // ctpop(HL) -> ctpop(H)+ctpop(L)
|
|
DAG.getNode(ISD::CTPOP, NVT, Lo),
|
|
DAG.getNode(ISD::CTPOP, NVT, Hi));
|
|
Hi = DAG.getConstant(0, NVT);
|
|
break;
|
|
|
|
case ISD::CTLZ: {
|
|
// ctlz (HL) -> ctlz(H) != 32 ? ctlz(H) : (ctlz(L)+32)
|
|
ExpandOp(Node->getOperand(0), Lo, Hi);
|
|
SDOperand BitsC = DAG.getConstant(MVT::getSizeInBits(NVT), NVT);
|
|
SDOperand HLZ = DAG.getNode(ISD::CTLZ, NVT, Hi);
|
|
SDOperand TopNotZero = DAG.getSetCC(TLI.getSetCCResultTy(), HLZ, BitsC,
|
|
ISD::SETNE);
|
|
SDOperand LowPart = DAG.getNode(ISD::CTLZ, NVT, Lo);
|
|
LowPart = DAG.getNode(ISD::ADD, NVT, LowPart, BitsC);
|
|
|
|
Lo = DAG.getNode(ISD::SELECT, NVT, TopNotZero, HLZ, LowPart);
|
|
Hi = DAG.getConstant(0, NVT);
|
|
break;
|
|
}
|
|
|
|
case ISD::CTTZ: {
|
|
// cttz (HL) -> cttz(L) != 32 ? cttz(L) : (cttz(H)+32)
|
|
ExpandOp(Node->getOperand(0), Lo, Hi);
|
|
SDOperand BitsC = DAG.getConstant(MVT::getSizeInBits(NVT), NVT);
|
|
SDOperand LTZ = DAG.getNode(ISD::CTTZ, NVT, Lo);
|
|
SDOperand BotNotZero = DAG.getSetCC(TLI.getSetCCResultTy(), LTZ, BitsC,
|
|
ISD::SETNE);
|
|
SDOperand HiPart = DAG.getNode(ISD::CTTZ, NVT, Hi);
|
|
HiPart = DAG.getNode(ISD::ADD, NVT, HiPart, BitsC);
|
|
|
|
Lo = DAG.getNode(ISD::SELECT, NVT, BotNotZero, LTZ, HiPart);
|
|
Hi = DAG.getConstant(0, NVT);
|
|
break;
|
|
}
|
|
|
|
case ISD::LOAD: {
|
|
SDOperand Ch = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
SDOperand Ptr = LegalizeOp(Node->getOperand(1)); // Legalize the pointer.
|
|
Lo = DAG.getLoad(NVT, Ch, Ptr, Node->getOperand(2));
|
|
|
|
// Increment the pointer to the other half.
|
|
unsigned IncrementSize = MVT::getSizeInBits(Lo.getValueType())/8;
|
|
Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
|
|
getIntPtrConstant(IncrementSize));
|
|
//Is this safe? declaring that the two parts of the split load
|
|
//are from the same instruction?
|
|
Hi = DAG.getLoad(NVT, Ch, Ptr, Node->getOperand(2));
|
|
|
|
// Build a factor node to remember that this load is independent of the
|
|
// other one.
|
|
SDOperand TF = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
|
|
Hi.getValue(1));
|
|
|
|
// Remember that we legalized the chain.
|
|
AddLegalizedOperand(Op.getValue(1), TF);
|
|
if (!TLI.isLittleEndian())
|
|
std::swap(Lo, Hi);
|
|
break;
|
|
}
|
|
case ISD::TAILCALL:
|
|
case ISD::CALL: {
|
|
SDOperand Chain = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
|
|
SDOperand Callee = LegalizeOp(Node->getOperand(1)); // Legalize the callee.
|
|
|
|
bool Changed = false;
|
|
std::vector<SDOperand> Ops;
|
|
for (unsigned i = 2, e = Node->getNumOperands(); i != e; ++i) {
|
|
Ops.push_back(LegalizeOp(Node->getOperand(i)));
|
|
Changed |= Ops.back() != Node->getOperand(i);
|
|
}
|
|
|
|
assert(Node->getNumValues() == 2 && Op.ResNo == 0 &&
|
|
"Can only expand a call once so far, not i64 -> i16!");
|
|
|
|
std::vector<MVT::ValueType> RetTyVTs;
|
|
RetTyVTs.reserve(3);
|
|
RetTyVTs.push_back(NVT);
|
|
RetTyVTs.push_back(NVT);
|
|
RetTyVTs.push_back(MVT::Other);
|
|
SDNode *NC = DAG.getCall(RetTyVTs, Chain, Callee, Ops,
|
|
Node->getOpcode() == ISD::TAILCALL);
|
|
Lo = SDOperand(NC, 0);
|
|
Hi = SDOperand(NC, 1);
|
|
|
|
// Insert the new chain mapping.
|
|
AddLegalizedOperand(Op.getValue(1), Hi.getValue(2));
|
|
break;
|
|
}
|
|
case ISD::AND:
|
|
case ISD::OR:
|
|
case ISD::XOR: { // Simple logical operators -> two trivial pieces.
|
|
SDOperand LL, LH, RL, RH;
|
|
ExpandOp(Node->getOperand(0), LL, LH);
|
|
ExpandOp(Node->getOperand(1), RL, RH);
|
|
Lo = DAG.getNode(Node->getOpcode(), NVT, LL, RL);
|
|
Hi = DAG.getNode(Node->getOpcode(), NVT, LH, RH);
|
|
break;
|
|
}
|
|
case ISD::SELECT: {
|
|
SDOperand C, LL, LH, RL, RH;
|
|
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "It's impossible to expand bools");
|
|
case Legal:
|
|
C = LegalizeOp(Node->getOperand(0)); // Legalize the condition.
|
|
break;
|
|
case Promote:
|
|
C = PromoteOp(Node->getOperand(0)); // Promote the condition.
|
|
break;
|
|
}
|
|
ExpandOp(Node->getOperand(1), LL, LH);
|
|
ExpandOp(Node->getOperand(2), RL, RH);
|
|
Lo = DAG.getNode(ISD::SELECT, NVT, C, LL, RL);
|
|
Hi = DAG.getNode(ISD::SELECT, NVT, C, LH, RH);
|
|
break;
|
|
}
|
|
case ISD::SELECT_CC: {
|
|
SDOperand TL, TH, FL, FH;
|
|
ExpandOp(Node->getOperand(2), TL, TH);
|
|
ExpandOp(Node->getOperand(3), FL, FH);
|
|
Lo = DAG.getNode(ISD::SELECT_CC, NVT, Node->getOperand(0),
|
|
Node->getOperand(1), TL, FL, Node->getOperand(4));
|
|
Hi = DAG.getNode(ISD::SELECT_CC, NVT, Node->getOperand(0),
|
|
Node->getOperand(1), TH, FH, Node->getOperand(4));
|
|
Lo = LegalizeOp(Lo);
|
|
Hi = LegalizeOp(Hi);
|
|
break;
|
|
}
|
|
case ISD::ANY_EXTEND: {
|
|
SDOperand In;
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "expand-expand not implemented yet!");
|
|
case Legal: In = LegalizeOp(Node->getOperand(0)); break;
|
|
case Promote:
|
|
In = PromoteOp(Node->getOperand(0));
|
|
break;
|
|
}
|
|
|
|
// The low part is any extension of the input (which degenerates to a copy).
|
|
Lo = DAG.getNode(ISD::ANY_EXTEND, NVT, In);
|
|
// The high part is undefined.
|
|
Hi = DAG.getNode(ISD::UNDEF, NVT);
|
|
break;
|
|
}
|
|
case ISD::SIGN_EXTEND: {
|
|
SDOperand In;
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "expand-expand not implemented yet!");
|
|
case Legal: In = LegalizeOp(Node->getOperand(0)); break;
|
|
case Promote:
|
|
In = PromoteOp(Node->getOperand(0));
|
|
// Emit the appropriate sign_extend_inreg to get the value we want.
|
|
In = DAG.getNode(ISD::SIGN_EXTEND_INREG, In.getValueType(), In,
|
|
DAG.getValueType(Node->getOperand(0).getValueType()));
|
|
break;
|
|
}
|
|
|
|
// The low part is just a sign extension of the input (which degenerates to
|
|
// a copy).
|
|
Lo = DAG.getNode(ISD::SIGN_EXTEND, NVT, In);
|
|
|
|
// The high part is obtained by SRA'ing all but one of the bits of the lo
|
|
// part.
|
|
unsigned LoSize = MVT::getSizeInBits(Lo.getValueType());
|
|
Hi = DAG.getNode(ISD::SRA, NVT, Lo, DAG.getConstant(LoSize-1,
|
|
TLI.getShiftAmountTy()));
|
|
break;
|
|
}
|
|
case ISD::ZERO_EXTEND: {
|
|
SDOperand In;
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "expand-expand not implemented yet!");
|
|
case Legal: In = LegalizeOp(Node->getOperand(0)); break;
|
|
case Promote:
|
|
In = PromoteOp(Node->getOperand(0));
|
|
// Emit the appropriate zero_extend_inreg to get the value we want.
|
|
In = DAG.getZeroExtendInReg(In, Node->getOperand(0).getValueType());
|
|
break;
|
|
}
|
|
|
|
// The low part is just a zero extension of the input (which degenerates to
|
|
// a copy).
|
|
Lo = DAG.getNode(ISD::ZERO_EXTEND, NVT, In);
|
|
|
|
// The high part is just a zero.
|
|
Hi = DAG.getConstant(0, NVT);
|
|
break;
|
|
}
|
|
// These operators cannot be expanded directly, emit them as calls to
|
|
// library functions.
|
|
case ISD::FP_TO_SINT:
|
|
if (TLI.getOperationAction(ISD::FP_TO_SINT, VT) == TargetLowering::Custom) {
|
|
SDOperand Op;
|
|
switch (getTypeAction(Node->getOperand(0).getValueType())) {
|
|
case Expand: assert(0 && "cannot expand FP!");
|
|
case Legal: Op = LegalizeOp(Node->getOperand(0)); break;
|
|
case Promote: Op = PromoteOp(Node->getOperand(0)); break;
|
|
}
|
|
|
|
Op = TLI.LowerOperation(DAG.getNode(ISD::FP_TO_SINT, VT, Op), DAG);
|
|
|
|
// Now that the custom expander is done, expand the result, which is still
|
|
// VT.
|
|
if (Op.Val) {
|
|
ExpandOp(Op, Lo, Hi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (Node->getOperand(0).getValueType() == MVT::f32)
|
|
Lo = ExpandLibCall("__fixsfdi", Node, Hi);
|
|
else
|
|
Lo = ExpandLibCall("__fixdfdi", Node, Hi);
|
|
break;
|
|
|
|
case ISD::FP_TO_UINT:
|
|
if (TLI.getOperationAction(ISD::FP_TO_UINT, VT) == TargetLowering::Custom) {
|
|
SDOperand Op = DAG.getNode(ISD::FP_TO_UINT, VT,
|
|
LegalizeOp(Node->getOperand(0)));
|
|
// Now that the custom expander is done, expand the result, which is still
|
|
// VT.
|
|
Op = TLI.LowerOperation(Op, DAG);
|
|
if (Op.Val) {
|
|
ExpandOp(Op, Lo, Hi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (Node->getOperand(0).getValueType() == MVT::f32)
|
|
Lo = ExpandLibCall("__fixunssfdi", Node, Hi);
|
|
else
|
|
Lo = ExpandLibCall("__fixunsdfdi", Node, Hi);
|
|
break;
|
|
|
|
case ISD::SHL:
|
|
// If the target wants custom lowering, do so.
|
|
if (TLI.getOperationAction(ISD::SHL, VT) == TargetLowering::Custom) {
|
|
SDOperand Op = DAG.getNode(ISD::SHL, VT, Node->getOperand(0),
|
|
LegalizeOp(Node->getOperand(1)));
|
|
Op = TLI.LowerOperation(Op, DAG);
|
|
if (Op.Val) {
|
|
// Now that the custom expander is done, expand the result, which is
|
|
// still VT.
|
|
ExpandOp(Op, Lo, Hi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we can emit an efficient shift operation, do so now.
|
|
if (ExpandShift(ISD::SHL, Node->getOperand(0), Node->getOperand(1), Lo, Hi))
|
|
break;
|
|
|
|
// If this target supports SHL_PARTS, use it.
|
|
if (TLI.isOperationLegal(ISD::SHL_PARTS, NVT)) {
|
|
ExpandShiftParts(ISD::SHL_PARTS, Node->getOperand(0), Node->getOperand(1),
|
|
Lo, Hi);
|
|
break;
|
|
}
|
|
|
|
// Otherwise, emit a libcall.
|
|
Lo = ExpandLibCall("__ashldi3", Node, Hi);
|
|
break;
|
|
|
|
case ISD::SRA:
|
|
// If the target wants custom lowering, do so.
|
|
if (TLI.getOperationAction(ISD::SRA, VT) == TargetLowering::Custom) {
|
|
SDOperand Op = DAG.getNode(ISD::SRA, VT, Node->getOperand(0),
|
|
LegalizeOp(Node->getOperand(1)));
|
|
Op = TLI.LowerOperation(Op, DAG);
|
|
if (Op.Val) {
|
|
// Now that the custom expander is done, expand the result, which is
|
|
// still VT.
|
|
ExpandOp(Op, Lo, Hi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we can emit an efficient shift operation, do so now.
|
|
if (ExpandShift(ISD::SRA, Node->getOperand(0), Node->getOperand(1), Lo, Hi))
|
|
break;
|
|
|
|
// If this target supports SRA_PARTS, use it.
|
|
if (TLI.isOperationLegal(ISD::SRA_PARTS, NVT)) {
|
|
ExpandShiftParts(ISD::SRA_PARTS, Node->getOperand(0), Node->getOperand(1),
|
|
Lo, Hi);
|
|
break;
|
|
}
|
|
|
|
// Otherwise, emit a libcall.
|
|
Lo = ExpandLibCall("__ashrdi3", Node, Hi);
|
|
break;
|
|
case ISD::SRL:
|
|
// If the target wants custom lowering, do so.
|
|
if (TLI.getOperationAction(ISD::SRL, VT) == TargetLowering::Custom) {
|
|
SDOperand Op = DAG.getNode(ISD::SRL, VT, Node->getOperand(0),
|
|
LegalizeOp(Node->getOperand(1)));
|
|
Op = TLI.LowerOperation(Op, DAG);
|
|
if (Op.Val) {
|
|
// Now that the custom expander is done, expand the result, which is
|
|
// still VT.
|
|
ExpandOp(Op, Lo, Hi);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we can emit an efficient shift operation, do so now.
|
|
if (ExpandShift(ISD::SRL, Node->getOperand(0), Node->getOperand(1), Lo, Hi))
|
|
break;
|
|
|
|
// If this target supports SRL_PARTS, use it.
|
|
if (TLI.isOperationLegal(ISD::SRL_PARTS, NVT)) {
|
|
ExpandShiftParts(ISD::SRL_PARTS, Node->getOperand(0), Node->getOperand(1),
|
|
Lo, Hi);
|
|
break;
|
|
}
|
|
|
|
// Otherwise, emit a libcall.
|
|
Lo = ExpandLibCall("__lshrdi3", Node, Hi);
|
|
break;
|
|
|
|
case ISD::ADD:
|
|
ExpandByParts(ISD::ADD_PARTS, Node->getOperand(0), Node->getOperand(1),
|
|
Lo, Hi);
|
|
break;
|
|
case ISD::SUB:
|
|
ExpandByParts(ISD::SUB_PARTS, Node->getOperand(0), Node->getOperand(1),
|
|
Lo, Hi);
|
|
break;
|
|
case ISD::MUL: {
|
|
if (TLI.isOperationLegal(ISD::MULHU, NVT)) {
|
|
SDOperand LL, LH, RL, RH;
|
|
ExpandOp(Node->getOperand(0), LL, LH);
|
|
ExpandOp(Node->getOperand(1), RL, RH);
|
|
unsigned SH = MVT::getSizeInBits(RH.getValueType())-1;
|
|
// MULHS implicitly sign extends its inputs. Check to see if ExpandOp
|
|
// extended the sign bit of the low half through the upper half, and if so
|
|
// emit a MULHS instead of the alternate sequence that is valid for any
|
|
// i64 x i64 multiply.
|
|
if (TLI.isOperationLegal(ISD::MULHS, NVT) &&
|
|
// is RH an extension of the sign bit of RL?
|
|
RH.getOpcode() == ISD::SRA && RH.getOperand(0) == RL &&
|
|
RH.getOperand(1).getOpcode() == ISD::Constant &&
|
|
cast<ConstantSDNode>(RH.getOperand(1))->getValue() == SH &&
|
|
// is LH an extension of the sign bit of LL?
|
|
LH.getOpcode() == ISD::SRA && LH.getOperand(0) == LL &&
|
|
LH.getOperand(1).getOpcode() == ISD::Constant &&
|
|
cast<ConstantSDNode>(LH.getOperand(1))->getValue() == SH) {
|
|
Hi = DAG.getNode(ISD::MULHS, NVT, LL, RL);
|
|
} else {
|
|
Hi = DAG.getNode(ISD::MULHU, NVT, LL, RL);
|
|
RH = DAG.getNode(ISD::MUL, NVT, LL, RH);
|
|
LH = DAG.getNode(ISD::MUL, NVT, LH, RL);
|
|
Hi = DAG.getNode(ISD::ADD, NVT, Hi, RH);
|
|
Hi = DAG.getNode(ISD::ADD, NVT, Hi, LH);
|
|
}
|
|
Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
|
|
} else {
|
|
Lo = ExpandLibCall("__muldi3" , Node, Hi); break;
|
|
}
|
|
break;
|
|
}
|
|
case ISD::SDIV: Lo = ExpandLibCall("__divdi3" , Node, Hi); break;
|
|
case ISD::UDIV: Lo = ExpandLibCall("__udivdi3", Node, Hi); break;
|
|
case ISD::SREM: Lo = ExpandLibCall("__moddi3" , Node, Hi); break;
|
|
case ISD::UREM: Lo = ExpandLibCall("__umoddi3", Node, Hi); break;
|
|
}
|
|
|
|
// Remember in a map if the values will be reused later.
|
|
bool isNew = ExpandedNodes.insert(std::make_pair(Op,
|
|
std::make_pair(Lo, Hi))).second;
|
|
assert(isNew && "Value already expanded?!?");
|
|
}
|
|
|
|
|
|
// SelectionDAG::Legalize - This is the entry point for the file.
|
|
//
|
|
void SelectionDAG::Legalize() {
|
|
/// run - This is the main entry point to this class.
|
|
///
|
|
SelectionDAGLegalize(*this).Run();
|
|
}
|
|
|