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| author | Bob Wilson <bob.wilson@apple.com> | 2010-02-13 00:31:44 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2010-02-13 00:31:44 +0000 |
| commit | bf9b221c006a99d6f117c1048412859d5637bcde (patch) | |
| tree | cd3c5edb01642b2a7cf6f59ed13a8b28e1489359 /lib/CodeGen/LLVMTargetMachine.cpp | |
| parent | 39125d8ef94cbadccd7339d3344e114dedaab12c (diff) | |
| download | external_llvm-bf9b221c006a99d6f117c1048412859d5637bcde.zip external_llvm-bf9b221c006a99d6f117c1048412859d5637bcde.tar.gz external_llvm-bf9b221c006a99d6f117c1048412859d5637bcde.tar.bz2 | |
Besides removing phi cycles that reduce to a single value, also remove dead
phi cycles. Adjust a few tests to keep dead instructions from being optimized
away. This (together with my previous change for phi cycles) fixes Apple
radar 7627077.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96057 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/LLVMTargetMachine.cpp')
| -rw-r--r-- | lib/CodeGen/LLVMTargetMachine.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp index 0223feb..278de02 100644 --- a/lib/CodeGen/LLVMTargetMachine.cpp +++ b/lib/CodeGen/LLVMTargetMachine.cpp @@ -295,6 +295,10 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, printAndVerify(PM, "After Instruction Selection", /* allowDoubleDefs= */ true); + // Optimize PHIs before DCE: removing dead PHI cycles may make more + // instructions dead. + if (OptLevel != CodeGenOpt::None) + PM.add(createOptimizePHIsPass()); // Delete dead machine instructions regardless of optimization level. PM.add(createDeadMachineInstructionElimPass()); @@ -303,7 +307,6 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, if (OptLevel != CodeGenOpt::None) { PM.add(createOptimizeExtsPass()); - PM.add(createOptimizePHIsPass()); if (!DisableMachineLICM) PM.add(createMachineLICMPass()); if (!DisableMachineSink) |