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Don't waste time trying to CSE labels, phis, inline asm. Definitely avoid cse implicit-def for obvious performance reason.

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llvm-svn: 98009
This commit is contained in:
Evan Cheng 2010-03-08 23:49:12 +00:00
parent ca86fb517c
commit 8afdea401a
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/MachineCSE.cpp
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@ -171,6 +171,10 @@ bool MachineCSE::hasLivePhysRegDefUse(MachineInstr *MI, MachineBasicBlock *MBB){
}
bool MachineCSE::isCSECandidate(MachineInstr *MI) {
if (MI->isLabel() || MI->isPHI() || MI->isImplicitDef() ||
MI->isKill() || MI->isInlineAsm())
return false;
// Ignore copies or instructions that read / write physical registers
// (except for dead defs of physical registers).
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;