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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42132 91177308-0d34-0410-b5e6-96231b3b80d8
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Duncan Sands 2007-09-19 10:25:38 +00:00
parent 7801644332
commit 46318cdfd0
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -8939,8 +8939,9 @@ static bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom) {
// If it is an alloca it is always safe to load from.
if (isa<AllocaInst>(V)) return true;
// Don't try to evaluate aliases. External weak GV can be null.
// If it is a global variable it is mostly safe to load from.
if (const GlobalValue *GV = dyn_cast<GlobalVariable>(V))
// Don't try to evaluate aliases. External weak GV can be null.
return !isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage();
// Otherwise, be a little bit agressive by scanning the local block where we