maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

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

llvm-svn: 98009
This commit is contained in:
Evan Cheng 2010-03-08 23:49:12 +00:00
parent 8590544ea8
commit c9e8621268
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
llvm/lib/CodeGen/MachineCSE.cpp
View File

@ -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;