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Improve isSafeToLoadUnconditionally to recognize that GEPs with constant

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indices are safe if the result is known to be within the bounds of the
underlying object.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-01-29 19:19:08 +00:00
parent 01eba39793
commit 3eb4f7e2dd
6 changed files with 83 additions and 22 deletions
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4
lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
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@@ -199,8 +199,8 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
//
if (SelectInst *SI = dyn_cast<SelectInst>(Op)) {
// load (select (Cond, &V1, &V2)) --> select(Cond, load &V1, load &V2).
if (isSafeToLoadUnconditionally(SI->getOperand(1), SI) &&
isSafeToLoadUnconditionally(SI->getOperand(2), SI)) {
if (isSafeToLoadUnconditionally(SI->getOperand(1), SI, TD) &&
isSafeToLoadUnconditionally(SI->getOperand(2), SI, TD)) {
Value *V1 = Builder->CreateLoad(SI->getOperand(1),
SI->getOperand(1)->getName()+".val");
Value *V2 = Builder->CreateLoad(SI->getOperand(2),