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Strengthen GetUnderlyingObject using InstructionSimplify.

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While LLVM's main design is that analysis code shouldn't
go out of its way to understand code which hasn't been
InstCombined, analysis utility routines like this can
find themselves being called in the middle of transform
passes when instcombine hasn't had a chance to run.

llvm-svn: 121886
This commit is contained in:
Dan Gohman 2010-12-15 20:10:26 +00:00
parent 295ba3ab26
commit 8b09daa387
1 changed files with 9 additions and 0 deletions
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9
lib/Analysis/ValueTracking.cpp
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@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
#include "llvm/GlobalVariable.h"
@ -1440,6 +1441,14 @@ Value *llvm::GetUnderlyingObject(Value *V, unsigned MaxLookup) {
return V;
V = GA->getAliasee();
} else {
// See if InstructionSimplify knows any relevant tricks.
if (Instruction *I = dyn_cast<Instruction>(V))
// TODO: Aquire TargetData and DominatorTree and use them.
if (Value *Simplified = SimplifyInstruction(I, 0, 0)) {
V = Simplified;
continue;
}
return V;
}
assert(V->getType()->isPointerTy() && "Unexpected operand type!");