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Eliminate cast of same type instructions.

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llvm-svn: 2251
This commit is contained in:
Chris Lattner 2002-04-15 19:45:29 +00:00
parent bd8fdf2d57
commit 1923a5cfaa
1 changed files with 8 additions and 0 deletions
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8
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -18,6 +18,7 @@
#include "llvm/ConstantHandling.h"
#include "llvm/Function.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
#include "llvm/InstrTypes.h"
#include "llvm/Pass.h"
#include "llvm/Support/InstIterator.h"
@ -138,6 +139,13 @@ static bool CombineInstruction(Instruction *I) {
Result = CombineBinOp(BOP);
else if (MemAccessInst *MAI = dyn_cast<MemAccessInst>(I))
Result = CombineIndicies(MAI);
else if (CastInst *CI = dyn_cast<CastInst>(I)) {
if (CI->getType() == CI->getOperand(0)->getType() && !CI->use_empty()) {
CI->replaceAllUsesWith(CI->getOperand(0));
return true;
}
}
if (!Result) return false;
if (Result == I) return true;