Scanning entire basic block may be too expensive in terms of compile time. Instead, just use whatever location info first non-phi instruction has.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130729 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/BasicBlockUtils.cpp b/lib/Transforms/Utils/BasicBlockUtils.cpp
index c705cc5..92464e8 100644
--- a/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -542,11 +542,9 @@
/// GetFirstDebugLocInBasicBlock - Return first valid DebugLoc entry in a
/// given basic block.
DebugLoc llvm::GetFirstDebugLocInBasicBlock(const BasicBlock *BB) {
- for (BasicBlock::const_iterator BI = BB->begin(), BE = BB->end();
- BI != BE; ++BI) {
- DebugLoc DL = BI->getDebugLoc();
- if (!DL.isUnknown())
- return DL;
- }
+ if (const Instruction *I = BB->getFirstNonPHI())
+ return I->getDebugLoc();
+ // Scanning entire block may be too expensive, if the first instruction
+ // does not have valid location info.
return DebugLoc();
}