diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils/BasicBlockUtils.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/BasicBlockUtils.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp index aa7b933022c..a04092e54a9 100644 --- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp +++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp @@ -566,7 +566,13 @@ BasicBlock *llvm::SplitBlockPredecessors(BasicBlock *BB, // The new block unconditionally branches to the old block. BranchInst *BI = BranchInst::Create(BB, NewBB); - BI->setDebugLoc(BB->getFirstNonPHIOrDbg()->getDebugLoc()); + // Splitting the precedessors of a loop header creates a preheader block. + if (LI && LI->isLoopHeader(BB)) + // Using the loop start line number prevents debuggers stepping into the + // loop body for this instruction. + BI->setDebugLoc(LI->getLoopFor(BB)->getStartLoc()); + else + BI->setDebugLoc(BB->getFirstNonPHIOrDbg()->getDebugLoc()); // Move the edges from Preds to point to NewBB instead of BB. for (unsigned i = 0, e = Preds.size(); i != e; ++i) { |
