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author | Evan Cheng <evan.cheng@apple.com> | 2011-11-16 18:44:48 +0000 |
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committer | Evan Cheng <evan.cheng@apple.com> | 2011-11-16 18:44:48 +0000 |
commit | c3aa7c5c5aa1e06aa8a728149c6696401bd08faa (patch) | |
tree | 45420443c6f07ddeccaeb268ecdabf37db6c2ae7 /lib/CodeGen/TwoAddressInstructionPass.cpp | |
parent | 508a1f4db16baea5c0d5b1c4797d005dff1ee30f (diff) | |
download | external_llvm-c3aa7c5c5aa1e06aa8a728149c6696401bd08faa.zip external_llvm-c3aa7c5c5aa1e06aa8a728149c6696401bd08faa.tar.gz external_llvm-c3aa7c5c5aa1e06aa8a728149c6696401bd08faa.tar.bz2 |
Disable expensive two-address optimizations at -O0. rdar://10453055
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144806 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TwoAddressInstructionPass.cpp')
-rw-r--r-- | lib/CodeGen/TwoAddressInstructionPass.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index 7a0fcb5..a2e8134 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -68,6 +68,7 @@ namespace { MachineRegisterInfo *MRI; LiveVariables *LV; AliasAnalysis *AA; + CodeGenOpt::Level OptLevel; // DistanceMap - Keep track the distance of a MI from the start of the // current basic block. @@ -571,6 +572,9 @@ bool TwoAddressInstructionPass::isProfitableToCommute(unsigned regB, unsigned regC, MachineInstr *MI, MachineBasicBlock *MBB, unsigned Dist) { + if (OptLevel == CodeGenOpt::None) + return false; + // Determine if it's profitable to commute this two address instruction. In // general, we want no uses between this instruction and the definition of // the two-address register. @@ -1193,6 +1197,9 @@ TryInstructionTransform(MachineBasicBlock::iterator &mi, MachineFunction::iterator &mbbi, unsigned SrcIdx, unsigned DstIdx, unsigned Dist, SmallPtrSet<MachineInstr*, 8> &Processed) { + if (OptLevel == CodeGenOpt::None) + return false; + MachineInstr &MI = *mi; const MCInstrDesc &MCID = MI.getDesc(); unsigned regA = MI.getOperand(DstIdx).getReg(); @@ -1388,6 +1395,7 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) { InstrItins = TM.getInstrItineraryData(); LV = getAnalysisIfAvailable<LiveVariables>(); AA = &getAnalysis<AliasAnalysis>(); + OptLevel = TM.getOptLevel(); bool MadeChange = false; |