diff options
| author | Bob Wilson <bob.wilson@apple.com> | 2009-11-26 00:32:21 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2009-11-26 00:32:21 +0000 |
| commit | 15acadde5f87703da5f36721a19c09a7e3f97f53 (patch) | |
| tree | 379bad402a664a687cd94163cc84caa3f2438f41 /lib/CodeGen/LLVMTargetMachine.cpp | |
| parent | 36ccdd49f50535b74ce4d54561e426907629270a (diff) | |
Split tail duplication into a separate pass. This is needed to avoid
running tail duplication when doing branch folding for if-conversion, and
we also want to be able to run tail duplication earlier to fix some
reg alloc problems. Move the CanFallThrough function from BranchFolding
to MachineBasicBlock so that it can be shared by TailDuplication.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89904 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/LLVMTargetMachine.cpp')
| -rw-r--r-- | lib/CodeGen/LLVMTargetMachine.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp index 740c950842..9164f8278a 100644 --- a/lib/CodeGen/LLVMTargetMachine.cpp +++ b/lib/CodeGen/LLVMTargetMachine.cpp @@ -35,6 +35,8 @@ static cl::opt<bool> DisablePostRA("disable-post-ra", cl::Hidden, cl::desc("Disable Post Regalloc")); static cl::opt<bool> DisableBranchFold("disable-branch-fold", cl::Hidden, cl::desc("Disable branch folding")); +static cl::opt<bool> DisableTailDuplicate("disable-tail-duplicate", cl::Hidden, + cl::desc("Disable tail duplication")); static cl::opt<bool> DisableCodePlace("disable-code-place", cl::Hidden, cl::desc("Disable code placement")); static cl::opt<bool> DisableSSC("disable-ssc", cl::Hidden, @@ -344,6 +346,12 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, printAndVerify(PM, "After BranchFolding"); } + // Tail duplication. + if (OptLevel != CodeGenOpt::None && !DisableTailDuplicate) { + PM.add(createTailDuplicationPass()); + printAndVerify(PM, "After TailDuplication"); + } + PM.add(createGCMachineCodeAnalysisPass()); if (PrintGCInfo) |