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Reapply r121886, and also update DecomposeGEPExpression to keep

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it in sync.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121895 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-12-15 20:49:55 +00:00
parent e69b4ab829
commit c01895c7db
2 changed files with 17 additions and 0 deletions
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9
lib/Analysis/BasicAliasAnalysis.cpp
View File

@ -27,6 +27,7 @@
#include "llvm/Pass.h"
#include "llvm/Analysis/CaptureTracking.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Target/TargetData.h"
#include "llvm/ADT/SmallPtrSet.h"
@ -262,6 +263,14 @@ DecomposeGEPExpression(const Value *V, int64_t &BaseOffs,
V = Op->getOperand(0);
continue;
}
if (const Instruction *I = dyn_cast<Instruction>(V))
// TODO: Get a DominatorTree and use it here.
if (const Value *Simplified =
SimplifyInstruction(const_cast<Instruction *>(I), TD)) {
V = Simplified;
continue;
}
const GEPOperator *GEPOp = dyn_cast<GEPOperator>(Op);
if (GEPOp == 0)

8
lib/Analysis/ValueTracking.cpp
View File

@ -1441,6 +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!");