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https://github.com/c64scene-ar/llvm-6502.git
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707e018423
on any current target and aren't optimized in DAGCombiner. Instead of using intermediate nodes, expand the operations, choosing between simple loads/stores, target-specific code, and library calls, immediately. Previously, the code to emit optimized code for these operations was only used at initial SelectionDAG construction time; now it is used at all times. This fixes some cases where rep;movs was being used for small copies where simple loads/stores would be better. This also cleans up code that checks for alignments less than 4; let the targets make that decision instead of doing it in target-independent code. This allows x86 to use rep;movs in low-alignment cases. Also, this fixes a bug that resulted in the use of rep;stos for memsets of 0 with non-constant memory size when the alignment was at least 4. It's better to use the library in this case, which can be significantly faster when the size is large. This also preserves more SourceValue information when memory intrinsics are lowered into simple loads/stores. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49572 91177308-0d34-0410-b5e6-96231b3b80d8
955 lines
36 KiB
C++
955 lines
36 KiB
C++
//===-- SparcISelLowering.cpp - Sparc DAG Lowering Implementation ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the interfaces that Sparc uses to lower LLVM code into a
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// selection DAG.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcISelLowering.h"
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#include "SparcTargetMachine.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Calling Convention Implementation
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//===----------------------------------------------------------------------===//
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#include "SparcGenCallingConv.inc"
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static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
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// CCValAssign - represent the assignment of the return value to locations.
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SmallVector<CCValAssign, 16> RVLocs;
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unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
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bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
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// CCState - Info about the registers and stack slot.
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CCState CCInfo(CC, isVarArg, DAG.getTarget(), RVLocs);
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// Analize return values of ISD::RET
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CCInfo.AnalyzeReturn(Op.Val, RetCC_Sparc32);
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// If this is the first return lowered for this function, add the regs to the
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// liveout set for the function.
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if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
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for (unsigned i = 0; i != RVLocs.size(); ++i)
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if (RVLocs[i].isRegLoc())
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DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
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}
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SDOperand Chain = Op.getOperand(0);
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SDOperand Flag;
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// Copy the result values into the output registers.
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for (unsigned i = 0; i != RVLocs.size(); ++i) {
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CCValAssign &VA = RVLocs[i];
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assert(VA.isRegLoc() && "Can only return in registers!");
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// ISD::RET => ret chain, (regnum1,val1), ...
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// So i*2+1 index only the regnums.
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Chain = DAG.getCopyToReg(Chain, VA.getLocReg(), Op.getOperand(i*2+1), Flag);
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// Guarantee that all emitted copies are stuck together with flags.
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Flag = Chain.getValue(1);
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}
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if (Flag.Val)
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return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Chain, Flag);
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return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Chain);
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}
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/// LowerArguments - V8 uses a very simple ABI, where all values are passed in
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/// either one or two GPRs, including FP values. TODO: we should pass FP values
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/// in FP registers for fastcc functions.
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std::vector<SDOperand>
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SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
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MachineFunction &MF = DAG.getMachineFunction();
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MachineRegisterInfo &RegInfo = MF.getRegInfo();
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std::vector<SDOperand> ArgValues;
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static const unsigned ArgRegs[] = {
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SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
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};
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const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
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unsigned ArgOffset = 68;
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SDOperand Root = DAG.getRoot();
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std::vector<SDOperand> OutChains;
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for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
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MVT::ValueType ObjectVT = getValueType(I->getType());
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switch (ObjectVT) {
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default: assert(0 && "Unhandled argument type!");
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case MVT::i1:
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case MVT::i8:
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case MVT::i16:
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case MVT::i32:
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if (I->use_empty()) { // Argument is dead.
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if (CurArgReg < ArgRegEnd) ++CurArgReg;
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ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
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} else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
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unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
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MF.getRegInfo().addLiveIn(*CurArgReg++, VReg);
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SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
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if (ObjectVT != MVT::i32) {
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unsigned AssertOp = ISD::AssertSext;
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Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
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DAG.getValueType(ObjectVT));
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Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
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}
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ArgValues.push_back(Arg);
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} else {
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int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
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SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
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SDOperand Load;
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if (ObjectVT == MVT::i32) {
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Load = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
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} else {
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ISD::LoadExtType LoadOp = ISD::SEXTLOAD;
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// Sparc is big endian, so add an offset based on the ObjectVT.
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unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8);
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FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr,
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DAG.getConstant(Offset, MVT::i32));
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Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
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NULL, 0, ObjectVT);
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Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load);
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}
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ArgValues.push_back(Load);
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}
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ArgOffset += 4;
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break;
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case MVT::f32:
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if (I->use_empty()) { // Argument is dead.
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if (CurArgReg < ArgRegEnd) ++CurArgReg;
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ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
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} else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
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// FP value is passed in an integer register.
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unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
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MF.getRegInfo().addLiveIn(*CurArgReg++, VReg);
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SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
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Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg);
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ArgValues.push_back(Arg);
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} else {
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int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
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SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
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SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, NULL, 0);
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ArgValues.push_back(Load);
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}
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ArgOffset += 4;
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break;
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case MVT::i64:
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case MVT::f64:
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if (I->use_empty()) { // Argument is dead.
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if (CurArgReg < ArgRegEnd) ++CurArgReg;
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if (CurArgReg < ArgRegEnd) ++CurArgReg;
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ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
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} else {
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SDOperand HiVal;
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if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
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unsigned VRegHi = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
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MF.getRegInfo().addLiveIn(*CurArgReg++, VRegHi);
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HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
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} else {
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int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
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SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
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HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
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}
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SDOperand LoVal;
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if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
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unsigned VRegLo = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
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MF.getRegInfo().addLiveIn(*CurArgReg++, VRegLo);
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LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
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} else {
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int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
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SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
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LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
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}
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// Compose the two halves together into an i64 unit.
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SDOperand WholeValue =
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DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
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// If we want a double, do a bit convert.
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if (ObjectVT == MVT::f64)
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WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue);
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ArgValues.push_back(WholeValue);
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}
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ArgOffset += 8;
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break;
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}
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}
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// Store remaining ArgRegs to the stack if this is a varargs function.
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if (F.isVarArg()) {
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// Remember the vararg offset for the va_start implementation.
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VarArgsFrameOffset = ArgOffset;
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for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
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unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
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MF.getRegInfo().addLiveIn(*CurArgReg, VReg);
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SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
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int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
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SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
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OutChains.push_back(DAG.getStore(DAG.getRoot(), Arg, FIPtr, NULL, 0));
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ArgOffset += 4;
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}
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}
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if (!OutChains.empty())
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DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other,
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&OutChains[0], OutChains.size()));
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return ArgValues;
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}
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static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
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unsigned CallingConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
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SDOperand Chain = Op.getOperand(0);
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SDOperand Callee = Op.getOperand(4);
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bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
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#if 0
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// Analyze operands of the call, assigning locations to each operand.
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SmallVector<CCValAssign, 16> ArgLocs;
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CCState CCInfo(CallingConv, isVarArg, DAG.getTarget(), ArgLocs);
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CCInfo.AnalyzeCallOperands(Op.Val, CC_Sparc32);
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// Get the size of the outgoing arguments stack space requirement.
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unsigned ArgsSize = CCInfo.getNextStackOffset();
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// FIXME: We can't use this until f64 is known to take two GPRs.
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#else
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(void)CC_Sparc32;
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// Count the size of the outgoing arguments.
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unsigned ArgsSize = 0;
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for (unsigned i = 5, e = Op.getNumOperands(); i != e; i += 2) {
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switch (Op.getOperand(i).getValueType()) {
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default: assert(0 && "Unknown value type!");
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case MVT::i1:
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case MVT::i8:
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case MVT::i16:
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case MVT::i32:
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case MVT::f32:
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ArgsSize += 4;
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break;
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case MVT::i64:
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case MVT::f64:
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ArgsSize += 8;
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break;
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}
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}
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if (ArgsSize > 4*6)
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ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
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else
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ArgsSize = 0;
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#endif
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// Keep stack frames 8-byte aligned.
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ArgsSize = (ArgsSize+7) & ~7;
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Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(ArgsSize));
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SmallVector<std::pair<unsigned, SDOperand>, 8> RegsToPass;
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SmallVector<SDOperand, 8> MemOpChains;
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#if 0
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// Walk the register/memloc assignments, inserting copies/loads.
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for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
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CCValAssign &VA = ArgLocs[i];
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// Arguments start after the 5 first operands of ISD::CALL
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SDOperand Arg = Op.getOperand(5+2*VA.getValNo());
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// Promote the value if needed.
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switch (VA.getLocInfo()) {
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default: assert(0 && "Unknown loc info!");
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case CCValAssign::Full: break;
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case CCValAssign::SExt:
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Arg = DAG.getNode(ISD::SIGN_EXTEND, VA.getLocVT(), Arg);
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break;
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case CCValAssign::ZExt:
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Arg = DAG.getNode(ISD::ZERO_EXTEND, VA.getLocVT(), Arg);
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break;
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case CCValAssign::AExt:
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Arg = DAG.getNode(ISD::ANY_EXTEND, VA.getLocVT(), Arg);
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break;
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}
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// Arguments that can be passed on register must be kept at
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// RegsToPass vector
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if (VA.isRegLoc()) {
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RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
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continue;
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}
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assert(VA.isMemLoc());
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// Create a store off the stack pointer for this argument.
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SDOperand StackPtr = DAG.getRegister(SP::O6, MVT::i32);
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// FIXME: VERIFY THAT 68 IS RIGHT.
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SDOperand PtrOff = DAG.getIntPtrConstant(VA.getLocMemOffset()+68);
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PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
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MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
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}
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#else
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static const unsigned ArgRegs[] = {
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SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
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};
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unsigned ArgOffset = 68;
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for (unsigned i = 5, e = Op.getNumOperands(); i != e; i += 2) {
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SDOperand Val = Op.getOperand(i);
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MVT::ValueType ObjectVT = Val.getValueType();
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SDOperand ValToStore(0, 0);
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unsigned ObjSize;
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switch (ObjectVT) {
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default: assert(0 && "Unhandled argument type!");
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case MVT::i32:
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ObjSize = 4;
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if (RegsToPass.size() >= 6) {
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ValToStore = Val;
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} else {
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RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Val));
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}
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break;
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case MVT::f32:
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ObjSize = 4;
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if (RegsToPass.size() >= 6) {
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ValToStore = Val;
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} else {
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// Convert this to a FP value in an int reg.
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Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
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RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Val));
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}
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break;
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case MVT::f64:
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ObjSize = 8;
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// Otherwise, convert this to a FP value in int regs.
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Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
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// FALL THROUGH
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case MVT::i64:
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ObjSize = 8;
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if (RegsToPass.size() >= 6) {
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ValToStore = Val; // Whole thing is passed in memory.
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break;
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}
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// Split the value into top and bottom part. Top part goes in a reg.
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SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
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DAG.getConstant(1, MVT::i32));
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SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
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DAG.getConstant(0, MVT::i32));
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RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Hi));
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if (RegsToPass.size() >= 6) {
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ValToStore = Lo;
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ArgOffset += 4;
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ObjSize = 4;
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} else {
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RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Lo));
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}
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break;
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}
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if (ValToStore.Val) {
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SDOperand StackPtr = DAG.getRegister(SP::O6, MVT::i32);
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SDOperand PtrOff = DAG.getConstant(ArgOffset, MVT::i32);
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PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
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MemOpChains.push_back(DAG.getStore(Chain, ValToStore, PtrOff, NULL, 0));
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}
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ArgOffset += ObjSize;
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}
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#endif
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// Emit all stores, make sure the occur before any copies into physregs.
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if (!MemOpChains.empty())
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Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
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&MemOpChains[0], MemOpChains.size());
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// Build a sequence of copy-to-reg nodes chained together with token
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// chain and flag operands which copy the outgoing args into registers.
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// The InFlag in necessary since all emited instructions must be
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// stuck together.
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SDOperand InFlag;
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for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
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unsigned Reg = RegsToPass[i].first;
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// Remap I0->I7 -> O0->O7.
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if (Reg >= SP::I0 && Reg <= SP::I7)
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Reg = Reg-SP::I0+SP::O0;
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Chain = DAG.getCopyToReg(Chain, Reg, RegsToPass[i].second, InFlag);
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InFlag = Chain.getValue(1);
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}
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// If the callee is a GlobalAddress node (quite common, every direct call is)
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// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
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// Likewise ExternalSymbol -> TargetExternalSymbol.
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if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
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Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
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else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
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Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
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std::vector<MVT::ValueType> NodeTys;
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NodeTys.push_back(MVT::Other); // Returns a chain
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NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
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SDOperand Ops[] = { Chain, Callee, InFlag };
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Chain = DAG.getNode(SPISD::CALL, NodeTys, Ops, InFlag.Val ? 3 : 2);
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InFlag = Chain.getValue(1);
|
|
|
|
Chain = DAG.getCALLSEQ_END(Chain,
|
|
DAG.getConstant(ArgsSize, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32), InFlag);
|
|
InFlag = Chain.getValue(1);
|
|
|
|
// Assign locations to each value returned by this call.
|
|
SmallVector<CCValAssign, 16> RVLocs;
|
|
CCState RVInfo(CallingConv, isVarArg, DAG.getTarget(), RVLocs);
|
|
|
|
RVInfo.AnalyzeCallResult(Op.Val, RetCC_Sparc32);
|
|
SmallVector<SDOperand, 8> ResultVals;
|
|
|
|
// Copy all of the result registers out of their specified physreg.
|
|
for (unsigned i = 0; i != RVLocs.size(); ++i) {
|
|
unsigned Reg = RVLocs[i].getLocReg();
|
|
|
|
// Remap I0->I7 -> O0->O7.
|
|
if (Reg >= SP::I0 && Reg <= SP::I7)
|
|
Reg = Reg-SP::I0+SP::O0;
|
|
|
|
Chain = DAG.getCopyFromReg(Chain, Reg,
|
|
RVLocs[i].getValVT(), InFlag).getValue(1);
|
|
InFlag = Chain.getValue(2);
|
|
ResultVals.push_back(Chain.getValue(0));
|
|
}
|
|
|
|
ResultVals.push_back(Chain);
|
|
|
|
// Merge everything together with a MERGE_VALUES node.
|
|
return DAG.getNode(ISD::MERGE_VALUES, Op.Val->getVTList(),
|
|
&ResultVals[0], ResultVals.size());
|
|
}
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// TargetLowering Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC
|
|
/// condition.
|
|
static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) {
|
|
switch (CC) {
|
|
default: assert(0 && "Unknown integer condition code!");
|
|
case ISD::SETEQ: return SPCC::ICC_E;
|
|
case ISD::SETNE: return SPCC::ICC_NE;
|
|
case ISD::SETLT: return SPCC::ICC_L;
|
|
case ISD::SETGT: return SPCC::ICC_G;
|
|
case ISD::SETLE: return SPCC::ICC_LE;
|
|
case ISD::SETGE: return SPCC::ICC_GE;
|
|
case ISD::SETULT: return SPCC::ICC_CS;
|
|
case ISD::SETULE: return SPCC::ICC_LEU;
|
|
case ISD::SETUGT: return SPCC::ICC_GU;
|
|
case ISD::SETUGE: return SPCC::ICC_CC;
|
|
}
|
|
}
|
|
|
|
/// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC
|
|
/// FCC condition.
|
|
static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) {
|
|
switch (CC) {
|
|
default: assert(0 && "Unknown fp condition code!");
|
|
case ISD::SETEQ:
|
|
case ISD::SETOEQ: return SPCC::FCC_E;
|
|
case ISD::SETNE:
|
|
case ISD::SETUNE: return SPCC::FCC_NE;
|
|
case ISD::SETLT:
|
|
case ISD::SETOLT: return SPCC::FCC_L;
|
|
case ISD::SETGT:
|
|
case ISD::SETOGT: return SPCC::FCC_G;
|
|
case ISD::SETLE:
|
|
case ISD::SETOLE: return SPCC::FCC_LE;
|
|
case ISD::SETGE:
|
|
case ISD::SETOGE: return SPCC::FCC_GE;
|
|
case ISD::SETULT: return SPCC::FCC_UL;
|
|
case ISD::SETULE: return SPCC::FCC_ULE;
|
|
case ISD::SETUGT: return SPCC::FCC_UG;
|
|
case ISD::SETUGE: return SPCC::FCC_UGE;
|
|
case ISD::SETUO: return SPCC::FCC_U;
|
|
case ISD::SETO: return SPCC::FCC_O;
|
|
case ISD::SETONE: return SPCC::FCC_LG;
|
|
case ISD::SETUEQ: return SPCC::FCC_UE;
|
|
}
|
|
}
|
|
|
|
|
|
SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
|
|
: TargetLowering(TM) {
|
|
|
|
// Set up the register classes.
|
|
addRegisterClass(MVT::i32, SP::IntRegsRegisterClass);
|
|
addRegisterClass(MVT::f32, SP::FPRegsRegisterClass);
|
|
addRegisterClass(MVT::f64, SP::DFPRegsRegisterClass);
|
|
|
|
// Turn FP extload into load/fextend
|
|
setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
|
|
// Sparc doesn't have i1 sign extending load
|
|
setLoadXAction(ISD::SEXTLOAD, MVT::i1, Promote);
|
|
// Turn FP truncstore into trunc + store.
|
|
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
|
|
|
|
// Custom legalize GlobalAddress nodes into LO/HI parts.
|
|
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
|
|
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
|
|
setOperationAction(ISD::ConstantPool , MVT::i32, Custom);
|
|
|
|
// Sparc doesn't have sext_inreg, replace them with shl/sra
|
|
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
|
|
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
|
|
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
|
|
|
|
// Sparc has no REM or DIVREM operations.
|
|
setOperationAction(ISD::UREM, MVT::i32, Expand);
|
|
setOperationAction(ISD::SREM, MVT::i32, Expand);
|
|
setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
|
|
setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
|
|
|
|
// Custom expand fp<->sint
|
|
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
|
|
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
|
|
|
|
// Expand fp<->uint
|
|
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
|
|
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
|
|
|
|
setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
|
|
setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
|
|
|
|
// Sparc has no select or setcc: expand to SELECT_CC.
|
|
setOperationAction(ISD::SELECT, MVT::i32, Expand);
|
|
setOperationAction(ISD::SELECT, MVT::f32, Expand);
|
|
setOperationAction(ISD::SELECT, MVT::f64, Expand);
|
|
setOperationAction(ISD::SETCC, MVT::i32, Expand);
|
|
setOperationAction(ISD::SETCC, MVT::f32, Expand);
|
|
setOperationAction(ISD::SETCC, MVT::f64, Expand);
|
|
|
|
// Sparc doesn't have BRCOND either, it has BR_CC.
|
|
setOperationAction(ISD::BRCOND, MVT::Other, Expand);
|
|
setOperationAction(ISD::BRIND, MVT::Other, Expand);
|
|
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
|
|
setOperationAction(ISD::BR_CC, MVT::i32, Custom);
|
|
setOperationAction(ISD::BR_CC, MVT::f32, Custom);
|
|
setOperationAction(ISD::BR_CC, MVT::f64, Custom);
|
|
|
|
setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
|
|
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
|
|
setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
|
|
|
|
// SPARC has no intrinsics for these particular operations.
|
|
setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
|
|
|
|
setOperationAction(ISD::FSIN , MVT::f64, Expand);
|
|
setOperationAction(ISD::FCOS , MVT::f64, Expand);
|
|
setOperationAction(ISD::FREM , MVT::f64, Expand);
|
|
setOperationAction(ISD::FSIN , MVT::f32, Expand);
|
|
setOperationAction(ISD::FCOS , MVT::f32, Expand);
|
|
setOperationAction(ISD::FREM , MVT::f32, Expand);
|
|
setOperationAction(ISD::CTPOP, MVT::i32, Expand);
|
|
setOperationAction(ISD::CTTZ , MVT::i32, Expand);
|
|
setOperationAction(ISD::CTLZ , MVT::i32, Expand);
|
|
setOperationAction(ISD::ROTL , MVT::i32, Expand);
|
|
setOperationAction(ISD::ROTR , MVT::i32, Expand);
|
|
setOperationAction(ISD::BSWAP, MVT::i32, Expand);
|
|
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
|
|
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
|
|
setOperationAction(ISD::FPOW , MVT::f64, Expand);
|
|
setOperationAction(ISD::FPOW , MVT::f32, Expand);
|
|
|
|
setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
|
|
setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
|
|
setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
|
|
|
|
// FIXME: Sparc provides these multiplies, but we don't have them yet.
|
|
setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
|
|
|
|
// We don't have line number support yet.
|
|
setOperationAction(ISD::LOCATION, MVT::Other, Expand);
|
|
setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
|
|
setOperationAction(ISD::LABEL, MVT::Other, Expand);
|
|
|
|
// RET must be custom lowered, to meet ABI requirements
|
|
setOperationAction(ISD::RET , MVT::Other, Custom);
|
|
|
|
// VASTART needs to be custom lowered to use the VarArgsFrameIndex.
|
|
setOperationAction(ISD::VASTART , MVT::Other, Custom);
|
|
// VAARG needs to be lowered to not do unaligned accesses for doubles.
|
|
setOperationAction(ISD::VAARG , MVT::Other, Custom);
|
|
|
|
// Use the default implementation.
|
|
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
|
|
setOperationAction(ISD::VAEND , MVT::Other, Expand);
|
|
setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
|
|
setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
|
|
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
|
|
|
|
// No debug info support yet.
|
|
setOperationAction(ISD::LOCATION, MVT::Other, Expand);
|
|
setOperationAction(ISD::LABEL, MVT::Other, Expand);
|
|
setOperationAction(ISD::DECLARE, MVT::Other, Expand);
|
|
|
|
setStackPointerRegisterToSaveRestore(SP::O6);
|
|
|
|
if (TM.getSubtarget<SparcSubtarget>().isV9())
|
|
setOperationAction(ISD::CTPOP, MVT::i32, Legal);
|
|
|
|
computeRegisterProperties();
|
|
}
|
|
|
|
const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const {
|
|
switch (Opcode) {
|
|
default: return 0;
|
|
case SPISD::CMPICC: return "SPISD::CMPICC";
|
|
case SPISD::CMPFCC: return "SPISD::CMPFCC";
|
|
case SPISD::BRICC: return "SPISD::BRICC";
|
|
case SPISD::BRFCC: return "SPISD::BRFCC";
|
|
case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC";
|
|
case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC";
|
|
case SPISD::Hi: return "SPISD::Hi";
|
|
case SPISD::Lo: return "SPISD::Lo";
|
|
case SPISD::FTOI: return "SPISD::FTOI";
|
|
case SPISD::ITOF: return "SPISD::ITOF";
|
|
case SPISD::CALL: return "SPISD::CALL";
|
|
case SPISD::RET_FLAG: return "SPISD::RET_FLAG";
|
|
}
|
|
}
|
|
|
|
/// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to
|
|
/// be zero. Op is expected to be a target specific node. Used by DAG
|
|
/// combiner.
|
|
void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
|
|
const APInt &Mask,
|
|
APInt &KnownZero,
|
|
APInt &KnownOne,
|
|
const SelectionDAG &DAG,
|
|
unsigned Depth) const {
|
|
APInt KnownZero2, KnownOne2;
|
|
KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0); // Don't know anything.
|
|
|
|
switch (Op.getOpcode()) {
|
|
default: break;
|
|
case SPISD::SELECT_ICC:
|
|
case SPISD::SELECT_FCC:
|
|
DAG.ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne,
|
|
Depth+1);
|
|
DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2,
|
|
Depth+1);
|
|
assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
|
|
assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
|
|
|
|
// Only known if known in both the LHS and RHS.
|
|
KnownOne &= KnownOne2;
|
|
KnownZero &= KnownZero2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
|
|
// set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
|
|
static void LookThroughSetCC(SDOperand &LHS, SDOperand &RHS,
|
|
ISD::CondCode CC, unsigned &SPCC) {
|
|
if (isa<ConstantSDNode>(RHS) && cast<ConstantSDNode>(RHS)->getValue() == 0 &&
|
|
CC == ISD::SETNE &&
|
|
((LHS.getOpcode() == SPISD::SELECT_ICC &&
|
|
LHS.getOperand(3).getOpcode() == SPISD::CMPICC) ||
|
|
(LHS.getOpcode() == SPISD::SELECT_FCC &&
|
|
LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) &&
|
|
isa<ConstantSDNode>(LHS.getOperand(0)) &&
|
|
isa<ConstantSDNode>(LHS.getOperand(1)) &&
|
|
cast<ConstantSDNode>(LHS.getOperand(0))->getValue() == 1 &&
|
|
cast<ConstantSDNode>(LHS.getOperand(1))->getValue() == 0) {
|
|
SDOperand CMPCC = LHS.getOperand(3);
|
|
SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getValue();
|
|
LHS = CMPCC.getOperand(0);
|
|
RHS = CMPCC.getOperand(1);
|
|
}
|
|
}
|
|
|
|
static SDOperand LowerGLOBALADDRESS(SDOperand Op, SelectionDAG &DAG) {
|
|
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
|
|
SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
|
|
SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, GA);
|
|
SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, GA);
|
|
return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
|
|
}
|
|
|
|
static SDOperand LowerCONSTANTPOOL(SDOperand Op, SelectionDAG &DAG) {
|
|
ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
|
|
Constant *C = N->getConstVal();
|
|
SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment());
|
|
SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, CP);
|
|
SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, CP);
|
|
return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
|
|
}
|
|
|
|
static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
|
|
// Convert the fp value to integer in an FP register.
|
|
assert(Op.getValueType() == MVT::i32);
|
|
Op = DAG.getNode(SPISD::FTOI, MVT::f32, Op.getOperand(0));
|
|
return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
|
|
}
|
|
|
|
static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
|
|
assert(Op.getOperand(0).getValueType() == MVT::i32);
|
|
SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
|
|
// Convert the int value to FP in an FP register.
|
|
return DAG.getNode(SPISD::ITOF, Op.getValueType(), Tmp);
|
|
}
|
|
|
|
static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
|
|
SDOperand Chain = Op.getOperand(0);
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
|
|
SDOperand LHS = Op.getOperand(2);
|
|
SDOperand RHS = Op.getOperand(3);
|
|
SDOperand Dest = Op.getOperand(4);
|
|
unsigned Opc, SPCC = ~0U;
|
|
|
|
// If this is a br_cc of a "setcc", and if the setcc got lowered into
|
|
// an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
|
|
LookThroughSetCC(LHS, RHS, CC, SPCC);
|
|
|
|
// Get the condition flag.
|
|
SDOperand CompareFlag;
|
|
if (LHS.getValueType() == MVT::i32) {
|
|
std::vector<MVT::ValueType> VTs;
|
|
VTs.push_back(MVT::i32);
|
|
VTs.push_back(MVT::Flag);
|
|
SDOperand Ops[2] = { LHS, RHS };
|
|
CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1);
|
|
if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
|
|
Opc = SPISD::BRICC;
|
|
} else {
|
|
CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS);
|
|
if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
|
|
Opc = SPISD::BRFCC;
|
|
}
|
|
return DAG.getNode(Opc, MVT::Other, Chain, Dest,
|
|
DAG.getConstant(SPCC, MVT::i32), CompareFlag);
|
|
}
|
|
|
|
static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
|
|
SDOperand LHS = Op.getOperand(0);
|
|
SDOperand RHS = Op.getOperand(1);
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
|
|
SDOperand TrueVal = Op.getOperand(2);
|
|
SDOperand FalseVal = Op.getOperand(3);
|
|
unsigned Opc, SPCC = ~0U;
|
|
|
|
// If this is a select_cc of a "setcc", and if the setcc got lowered into
|
|
// an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
|
|
LookThroughSetCC(LHS, RHS, CC, SPCC);
|
|
|
|
SDOperand CompareFlag;
|
|
if (LHS.getValueType() == MVT::i32) {
|
|
std::vector<MVT::ValueType> VTs;
|
|
VTs.push_back(LHS.getValueType()); // subcc returns a value
|
|
VTs.push_back(MVT::Flag);
|
|
SDOperand Ops[2] = { LHS, RHS };
|
|
CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1);
|
|
Opc = SPISD::SELECT_ICC;
|
|
if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
|
|
} else {
|
|
CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS);
|
|
Opc = SPISD::SELECT_FCC;
|
|
if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
|
|
}
|
|
return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
|
|
DAG.getConstant(SPCC, MVT::i32), CompareFlag);
|
|
}
|
|
|
|
static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
|
|
SparcTargetLowering &TLI) {
|
|
// vastart just stores the address of the VarArgsFrameIndex slot into the
|
|
// memory location argument.
|
|
SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32,
|
|
DAG.getRegister(SP::I6, MVT::i32),
|
|
DAG.getConstant(TLI.getVarArgsFrameOffset(),
|
|
MVT::i32));
|
|
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
|
|
return DAG.getStore(Op.getOperand(0), Offset, Op.getOperand(1), SV, 0);
|
|
}
|
|
|
|
static SDOperand LowerVAARG(SDOperand Op, SelectionDAG &DAG) {
|
|
SDNode *Node = Op.Val;
|
|
MVT::ValueType VT = Node->getValueType(0);
|
|
SDOperand InChain = Node->getOperand(0);
|
|
SDOperand VAListPtr = Node->getOperand(1);
|
|
const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
|
|
SDOperand VAList = DAG.getLoad(MVT::i32, InChain, VAListPtr, SV, 0);
|
|
// Increment the pointer, VAList, to the next vaarg
|
|
SDOperand NextPtr = DAG.getNode(ISD::ADD, MVT::i32, VAList,
|
|
DAG.getConstant(MVT::getSizeInBits(VT)/8,
|
|
MVT::i32));
|
|
// Store the incremented VAList to the legalized pointer
|
|
InChain = DAG.getStore(VAList.getValue(1), NextPtr,
|
|
VAListPtr, SV, 0);
|
|
// Load the actual argument out of the pointer VAList, unless this is an
|
|
// f64 load.
|
|
if (VT != MVT::f64)
|
|
return DAG.getLoad(VT, InChain, VAList, NULL, 0);
|
|
|
|
// Otherwise, load it as i64, then do a bitconvert.
|
|
SDOperand V = DAG.getLoad(MVT::i64, InChain, VAList, NULL, 0);
|
|
|
|
// Bit-Convert the value to f64.
|
|
SDOperand Ops[2] = {
|
|
DAG.getNode(ISD::BIT_CONVERT, MVT::f64, V),
|
|
V.getValue(1)
|
|
};
|
|
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::f64, MVT::Other),
|
|
Ops, 2);
|
|
}
|
|
|
|
static SDOperand LowerDYNAMIC_STACKALLOC(SDOperand Op, SelectionDAG &DAG) {
|
|
SDOperand Chain = Op.getOperand(0); // Legalize the chain.
|
|
SDOperand Size = Op.getOperand(1); // Legalize the size.
|
|
|
|
unsigned SPReg = SP::O6;
|
|
SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, MVT::i32);
|
|
SDOperand NewSP = DAG.getNode(ISD::SUB, MVT::i32, SP, Size); // Value
|
|
Chain = DAG.getCopyToReg(SP.getValue(1), SPReg, NewSP); // Output chain
|
|
|
|
// The resultant pointer is actually 16 words from the bottom of the stack,
|
|
// to provide a register spill area.
|
|
SDOperand NewVal = DAG.getNode(ISD::ADD, MVT::i32, NewSP,
|
|
DAG.getConstant(96, MVT::i32));
|
|
std::vector<MVT::ValueType> Tys;
|
|
Tys.push_back(MVT::i32);
|
|
Tys.push_back(MVT::Other);
|
|
SDOperand Ops[2] = { NewVal, Chain };
|
|
return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2);
|
|
}
|
|
|
|
|
|
SDOperand SparcTargetLowering::
|
|
LowerOperation(SDOperand Op, SelectionDAG &DAG) {
|
|
switch (Op.getOpcode()) {
|
|
default: assert(0 && "Should not custom lower this!");
|
|
// Frame & Return address. Currently unimplemented
|
|
case ISD::RETURNADDR: return SDOperand();
|
|
case ISD::FRAMEADDR: return SDOperand();
|
|
case ISD::GlobalTLSAddress:
|
|
assert(0 && "TLS not implemented for Sparc.");
|
|
case ISD::GlobalAddress: return LowerGLOBALADDRESS(Op, DAG);
|
|
case ISD::ConstantPool: return LowerCONSTANTPOOL(Op, DAG);
|
|
case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
|
|
case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
|
|
case ISD::BR_CC: return LowerBR_CC(Op, DAG);
|
|
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
|
|
case ISD::VASTART: return LowerVASTART(Op, DAG, *this);
|
|
case ISD::VAARG: return LowerVAARG(Op, DAG);
|
|
case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
|
|
case ISD::CALL: return LowerCALL(Op, DAG);
|
|
case ISD::RET: return LowerRET(Op, DAG);
|
|
}
|
|
}
|
|
|
|
MachineBasicBlock *
|
|
SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
|
|
MachineBasicBlock *BB) {
|
|
const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
|
|
unsigned BROpcode;
|
|
unsigned CC;
|
|
// Figure out the conditional branch opcode to use for this select_cc.
|
|
switch (MI->getOpcode()) {
|
|
default: assert(0 && "Unknown SELECT_CC!");
|
|
case SP::SELECT_CC_Int_ICC:
|
|
case SP::SELECT_CC_FP_ICC:
|
|
case SP::SELECT_CC_DFP_ICC:
|
|
BROpcode = SP::BCOND;
|
|
break;
|
|
case SP::SELECT_CC_Int_FCC:
|
|
case SP::SELECT_CC_FP_FCC:
|
|
case SP::SELECT_CC_DFP_FCC:
|
|
BROpcode = SP::FBCOND;
|
|
break;
|
|
}
|
|
|
|
CC = (SPCC::CondCodes)MI->getOperand(3).getImm();
|
|
|
|
// To "insert" a SELECT_CC instruction, we actually have to insert the diamond
|
|
// control-flow pattern. The incoming instruction knows the destination vreg
|
|
// to set, the condition code register to branch on, the true/false values to
|
|
// select between, and a branch opcode to use.
|
|
const BasicBlock *LLVM_BB = BB->getBasicBlock();
|
|
ilist<MachineBasicBlock>::iterator It = BB;
|
|
++It;
|
|
|
|
// thisMBB:
|
|
// ...
|
|
// TrueVal = ...
|
|
// [f]bCC copy1MBB
|
|
// fallthrough --> copy0MBB
|
|
MachineBasicBlock *thisMBB = BB;
|
|
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
|
|
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
|
|
BuildMI(BB, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC);
|
|
MachineFunction *F = BB->getParent();
|
|
F->getBasicBlockList().insert(It, copy0MBB);
|
|
F->getBasicBlockList().insert(It, sinkMBB);
|
|
// Update machine-CFG edges by first adding all successors of the current
|
|
// block to the new block which will contain the Phi node for the select.
|
|
for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
|
|
e = BB->succ_end(); i != e; ++i)
|
|
sinkMBB->addSuccessor(*i);
|
|
// Next, remove all successors of the current block, and add the true
|
|
// and fallthrough blocks as its successors.
|
|
while(!BB->succ_empty())
|
|
BB->removeSuccessor(BB->succ_begin());
|
|
BB->addSuccessor(copy0MBB);
|
|
BB->addSuccessor(sinkMBB);
|
|
|
|
// copy0MBB:
|
|
// %FalseValue = ...
|
|
// # fallthrough to sinkMBB
|
|
BB = copy0MBB;
|
|
|
|
// Update machine-CFG edges
|
|
BB->addSuccessor(sinkMBB);
|
|
|
|
// sinkMBB:
|
|
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
|
|
// ...
|
|
BB = sinkMBB;
|
|
BuildMI(BB, TII.get(SP::PHI), MI->getOperand(0).getReg())
|
|
.addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
|
|
.addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
|
|
|
|
delete MI; // The pseudo instruction is gone now.
|
|
return BB;
|
|
}
|
|
|