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| author | Evan Cheng <evan.cheng@apple.com> | 2010-03-08 23:49:12 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-03-08 23:49:12 +0000 |
| commit | c9e8621268cc818bdde073e7fbbf25e78dc7cdb1 (patch) | |
| tree | 56485e831a4e63c8e6e3ae446cf5f32f61765002 /llvm/lib/CodeGen/MachineCSE.cpp | |
| parent | 8590544ea88ec219c3e9ed3f19122c0e8257565f (diff) | |
| download | llvm-c9e8621268cc818bdde073e7fbbf25e78dc7cdb1.zip llvm-c9e8621268cc818bdde073e7fbbf25e78dc7cdb1.tar.gz llvm-c9e8621268cc818bdde073e7fbbf25e78dc7cdb1.tar.bz2 | |
Don't waste time trying to CSE labels, phis, inline asm. Definitely avoid cse implicit-def for obvious performance reason.
llvm-svn: 98009
Diffstat (limited to 'llvm/lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCSE.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp index ce8ebbc..a0023fe 100644 --- a/llvm/lib/CodeGen/MachineCSE.cpp +++ b/llvm/lib/CodeGen/MachineCSE.cpp @@ -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; |