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Implement "AsCheapAsAMove" for some obviously cheap instructions: xor and the

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51662 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2008-05-29 01:02:09 +00:00
parent 3e93e630aa
commit bd0879d7d9
2 changed files with 50 additions and 42 deletions
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5
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -330,10 +330,13 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
InstructionRearranged:
const TargetRegisterClass* rc = MF.getRegInfo().getRegClass(regA);
MachineInstr *Orig = MRI->getVRegDef(regB);
const TargetInstrDesc &OrigTID = Orig->getDesc();
bool SawStore = false;
if (EnableReMat && Orig && Orig->isSafeToMove(TII, SawStore) &&
TII->isTriviallyReMaterializable(Orig)) {
OrigTID.isAsCheapAsAMove() && !OrigTID.mayLoad() &&
!OrigTID.isSimpleLoad()) {
DEBUG(cerr << "2addr: REMATTING : " << *Orig << "\n");
TII->reMaterialize(*mbbi, mi, regA, Orig);
ReMattedInstrs.insert(Orig);
} else {