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Detect and handle COPY in many places.

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This code is transitional, it will soon be possible to eliminate
isExtractSubreg, isInsertSubreg, and isMoveInstr in most places.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107547 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-07-03 00:04:37 +00:00
parent 43b8fd728b
commit 273f7e4299
10 changed files with 73 additions and 40 deletions
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19
lib/CodeGen/ProcessImplicitDefs.cpp
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@ -46,14 +46,15 @@ bool ProcessImplicitDefs::CanTurnIntoImplicitDef(MachineInstr *MI,
const TargetInstrInfo *tii_) {
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0)
Reg == SrcReg && DstSubReg == 0)
return true;
if (OpIdx == 2 && MI->isSubregToReg())
return true;
if (OpIdx == 1 && MI->isExtractSubreg())
return true;
return false;
switch(OpIdx) {
case 1: return (MI->isExtractSubreg() || MI->isCopy()) &&
MI->getOperand(0).getSubReg() == 0;
case 2: return MI->isSubregToReg() && MI->getOperand(0).getSubReg() == 0;
default: return false;
}
}
/// processImplicitDefs - Process IMPLICIT_DEF instructions and make sure
@ -219,8 +220,10 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
// Turn a copy use into an implicit_def.
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) {
if ((RMI->isCopy() && RMI->getOperand(1).getReg() == Reg &&
RMI->getOperand(0).getSubReg() == 0) ||
(tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg && DstSubReg == 0)) {
RMI->setDesc(tii_->get(TargetOpcode::IMPLICIT_DEF));
bool isKill = false;