diff options
| 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 | 01abf8fc2fc93c317f5f89e36c8999565b0dd7d8 (patch) | |
| tree | e1af6cc6661dd42219044e97709796cef1789d89 /llvm/lib/CodeGen/LLVMTargetMachine.cpp | |
| parent | fe873e7c10bd062ccd8a9505ed0220a5df07acd0 (diff) | |
| download | bcm5719-llvm-01abf8fc2fc93c317f5f89e36c8999565b0dd7d8.tar.gz bcm5719-llvm-01abf8fc2fc93c317f5f89e36c8999565b0dd7d8.zip | |
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.
llvm-svn: 96057
Diffstat (limited to 'llvm/lib/CodeGen/LLVMTargetMachine.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/LLVMTargetMachine.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp index 0223febe967..278de0269b6 100644 --- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp +++ b/llvm/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) |
