diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp index eefcbb44dbc..cae21e95fd5 100644 --- a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp +++ b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp @@ -1655,7 +1655,12 @@ void SROA::RewriteLoadUserOfWholeAlloca(LoadInst *LI, AllocaInst *AI, SrcField = BinaryOperator::CreateShl(SrcField, ShiftVal, "", LI); } - ResultVal = BinaryOperator::CreateOr(SrcField, ResultVal, "", LI); + // Don't create an 'or x, 0' on the first iteration. + if (!isa<Constant>(ResultVal) || + !cast<Constant>(ResultVal)->isNullValue()) + ResultVal = BinaryOperator::CreateOr(SrcField, ResultVal, "", LI); + else + ResultVal = SrcField; } // Handle tail padding by truncating the result |
