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simplify code.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60190 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-27 22:56:14 +00:00
parent cb03f8547d
commit 15678533f3
1 changed files with 12 additions and 4 deletions
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16
lib/Transforms/Scalar/TailDuplication.cpp
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@ -27,6 +27,7 @@
#include "llvm/Pass.h"
#include "llvm/Type.h"
#include "llvm/Support/CFG.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
@ -348,10 +349,17 @@ void TailDup::eliminateUnconditionalBranch(BranchInst *Branch) {
// instructions one last time, constant propagating and DCE'ing them, because
// they may not be needed anymore.
//
if (HadPHINodes)
while (BI != SourceBlock->end())
if (!dceInstruction(BI) && !doConstantPropagation(BI))
++BI;
if (HadPHINodes) {
while (BI != SourceBlock->end()) {
Instruction *Inst = BI++;
if (isInstructionTriviallyDead(Inst))
Inst->eraseFromParent();
else if (Constant *C = ConstantFoldInstruction(Inst)) {
Inst->replaceAllUsesWith(C);
Inst->eraseFromParent();
}
}
}
++NumEliminated; // We just killed a branch!
}