diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LICM.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Scalar/LICM.cpp b/llvm/lib/Transforms/Scalar/LICM.cpp index baa2594..be57640 100644 --- a/llvm/lib/Transforms/Scalar/LICM.cpp +++ b/llvm/lib/Transforms/Scalar/LICM.cpp @@ -461,7 +461,10 @@ void llvm::computeLoopSafetyInfo(LoopSafetyInfo *SafetyInfo, Loop *CurLoop) { SafetyInfo->MayThrow = SafetyInfo->HeaderMayThrow; // Iterate over loop instructions and compute safety info. - for (Loop::block_iterator BB = CurLoop->block_begin(), + // Skip header as it has been computed and stored in HeaderMayThrow. + // The first block in loopinfo.Blocks is guaranteed to be the header. + assert(Header == *CurLoop->getBlocks().begin() && "First block must be header"); + for (Loop::block_iterator BB = std::next(CurLoop->block_begin()), BBE = CurLoop->block_end(); (BB != BBE) && !SafetyInfo->MayThrow; ++BB) for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end(); |