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| author | Duncan Sands <baldrick@free.fr> | 2007-09-19 10:25:38 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2007-09-19 10:25:38 +0000 |
| commit | e40a94a0e0bf1f92031706f57124a3f3c0249078 (patch) | |
| tree | ca6b8fe194e69bf78707a3dc354ca1ab00990d38 /lib/Transforms | |
| parent | b276a33b8f5782aac328965a3ac0cbaaef1dee0b (diff) | |
| download | external_llvm-e40a94a0e0bf1f92031706f57124a3f3c0249078.zip external_llvm-e40a94a0e0bf1f92031706f57124a3f3c0249078.tar.gz external_llvm-e40a94a0e0bf1f92031706f57124a3f3c0249078.tar.bz2 | |
Improve comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42132 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 07eb252..3a7d101 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -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 |