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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 | f8de150bd306e91b4bf7e0962982239c31d13fe6 (patch) | |
| tree | 8d54d75ff219461b1f0f977af2904a41f3073dfc /lib/CodeGen/MachineCSE.cpp | |
| parent | 6df19429b0d16020cf10afa72dbedc4e8082f3ae (diff) | |
| download | external_llvm-f8de150bd306e91b4bf7e0962982239c31d13fe6.tar.gz external_llvm-f8de150bd306e91b4bf7e0962982239c31d13fe6.tar.bz2 external_llvm-f8de150bd306e91b4bf7e0962982239c31d13fe6.zip | |
Don't waste time trying to CSE labels, phis, inline asm. Definitely avoid cse implicit-def for obvious performance reason.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98009 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index ce8ebbc601..a0023feb98 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/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; |