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Add a pre-regalloc tail duplication pass.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-12-04 09:42:45 +00:00
parent 9d0f8bba17
commit 79fc6f44b6
3 changed files with 227 additions and 100 deletions
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lib/CodeGen/LLVMTargetMachine.cpp
+11 -1
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@@ -74,6 +74,9 @@ EnableFastISelOption("fast-isel", cl::Hidden,
static cl::opt<bool> EnableSplitGEPGVN("split-gep-gvn", cl::Hidden,
cl::desc("Split GEPs and run no-load GVN"));
static cl::opt<bool> PreAllocTailDup("pre-regalloc-taildup", cl::Hidden,
cl::desc("Pre-register allocation tail duplication"));
LLVMTargetMachine::LLVMTargetMachine(const Target &T,
const std::string &TargetTriple)
: TargetMachine(T) {
@@ -302,6 +305,13 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
/* allowDoubleDefs= */ true);
}
// Pre-ra tail duplication.
if (OptLevel != CodeGenOpt::None &&
!DisableTailDuplicate && PreAllocTailDup) {
PM.add(createTailDuplicatePass(true));
printAndVerify(PM, "After Pre-RegAlloc TailDuplicate");
}
// Run pre-ra passes.
if (addPreRegAlloc(PM, OptLevel))
printAndVerify(PM, "After PreRegAlloc passes",
@@ -348,7 +358,7 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
// Tail duplication.
if (OptLevel != CodeGenOpt::None && !DisableTailDuplicate) {
PM.add(createTailDuplicatePass());
PM.add(createTailDuplicatePass(false));
printAndVerify(PM, "After TailDuplicate");
}