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Use COPY in FastISel everywhere it is safe and trivial.

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The remaining copyRegToReg calls actually check the return value (shock!), so we
cannot trivially replace them with COPY instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108069 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-07-11 03:31:00 +00:00
parent 273c14f530
commit 5127f79913
2 changed files with 12 additions and 26 deletions
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12
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -527,10 +527,8 @@ bool FastISel::SelectCall(const User *I) {
unsigned Reg = TLI.getExceptionAddressRegister();
const TargetRegisterClass *RC = TLI.getRegClassFor(VT);
unsigned ResultReg = createResultReg(RC);
bool InsertedCopy = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
ResultReg, Reg, RC, RC, DL);
assert(InsertedCopy && "Can't copy address registers!");
InsertedCopy = InsertedCopy;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
ResultReg).addReg(Reg);
UpdateValueMap(I, ResultReg);
return true;
}
@ -557,10 +555,8 @@ bool FastISel::SelectCall(const User *I) {
EVT SrcVT = TLI.getPointerTy();
const TargetRegisterClass *RC = TLI.getRegClassFor(SrcVT);
unsigned ResultReg = createResultReg(RC);
bool InsertedCopy = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
ResultReg, Reg, RC, RC, DL);
assert(InsertedCopy && "Can't copy address registers!");
InsertedCopy = InsertedCopy;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
ResultReg).addReg(Reg);
bool ResultRegIsKill = hasTrivialKill(I);

26
lib/Target/X86/X86FastISel.cpp
View File

@ -1167,8 +1167,8 @@ bool X86FastISel::X86SelectShift(const Instruction *I) {
unsigned Op1Reg = getRegForValue(I->getOperand(1));
if (Op1Reg == 0) return false;
TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
CReg, Op1Reg, RC, RC, DL);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
CReg).addReg(Op1Reg);
// The shift instruction uses X86::CL. If we defined a super-register
// of X86::CL, emit a subreg KILL to precisely describe what we're doing here.
@ -1619,11 +1619,8 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
}
if (VA.isRegLoc()) {
TargetRegisterClass* RC = TLI.getRegClassFor(ArgVT);
bool Emitted = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
VA.getLocReg(), Arg, RC, RC, DL);
assert(Emitted && "Failed to emit a copy instruction!"); Emitted=Emitted;
Emitted = true;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
VA.getLocReg()).addReg(Arg);
RegArgs.push_back(VA.getLocReg());
} else {
unsigned LocMemOffset = VA.getLocMemOffset();
@ -1645,12 +1642,9 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
// ELF / PIC requires GOT in the EBX register before function calls via PLT
// GOT pointer.
if (Subtarget->isPICStyleGOT()) {
TargetRegisterClass *RC = X86::GR32RegisterClass;
unsigned Base = getInstrInfo()->getGlobalBaseReg(FuncInfo.MF);
bool Emitted = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
X86::EBX, Base, RC, RC, DL);
assert(Emitted && "Failed to emit a copy instruction!"); Emitted=Emitted;
Emitted = true;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
X86::EBX).addReg(Base);
}
// Issue the call.
@ -1716,7 +1710,6 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
assert(RVLocs.size() == 1 && "Can't handle multi-value calls!");
EVT CopyVT = RVLocs[0].getValVT();
TargetRegisterClass* DstRC = TLI.getRegClassFor(CopyVT);
TargetRegisterClass *SrcRC = DstRC;
// If this is a call to a function that returns an fp value on the x87 fp
// stack, but where we prefer to use the value in xmm registers, copy it
@ -1725,15 +1718,12 @@ bool X86FastISel::X86SelectCall(const Instruction *I) {
RVLocs[0].getLocReg() == X86::ST1) &&
isScalarFPTypeInSSEReg(RVLocs[0].getValVT())) {
CopyVT = MVT::f80;
SrcRC = X86::RSTRegisterClass;
DstRC = X86::RFP80RegisterClass;
}
unsigned ResultReg = createResultReg(DstRC);
bool Emitted = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt, ResultReg,
RVLocs[0].getLocReg(), DstRC, SrcRC, DL);
assert(Emitted && "Failed to emit a copy instruction!"); Emitted=Emitted;
Emitted = true;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
ResultReg).addReg(RVLocs[0].getLocReg());
UsedRegs.push_back(RVLocs[0].getLocReg());
if (CopyVT != RVLocs[0].getValVT()) {