diff options
Diffstat (limited to 'lib/Transforms/Utils/SimplifyCFG.cpp')
| -rw-r--r-- | lib/Transforms/Utils/SimplifyCFG.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp index 6da791bb1c..0edf7cadc8 100644 --- a/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/lib/Transforms/Utils/SimplifyCFG.cpp @@ -3786,11 +3786,12 @@ static bool passingValueIsAlwaysUndefined(Value *V, Instruction *I) { if (!C) return false; - if (!I->hasOneUse()) // Only look at single-use instructions, for compile time + if (I->use_empty()) return false; if (C->isNullValue()) { - Instruction *Use = I->use_back(); + // Only look at the first use, avoid hurting compile time with long uselists + User *Use = *I->use_begin(); // Now make sure that there are no instructions in between that can alter // control flow (eg. calls) |