diff options
| -rw-r--r-- | llvm/lib/Transforms/Vectorize/BBVectorize.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Vectorize/BBVectorize.cpp b/llvm/lib/Transforms/Vectorize/BBVectorize.cpp index 411d7f6ba33..4bd11c68446 100644 --- a/llvm/lib/Transforms/Vectorize/BBVectorize.cpp +++ b/llvm/lib/Transforms/Vectorize/BBVectorize.cpp @@ -994,6 +994,12 @@ namespace { unsigned JCost = getInstrCost(J->getOpcode(), JT1, JT2); Type *VT1 = getVecTypeForPair(IT1, JT1), *VT2 = getVecTypeForPair(IT2, JT2); + + // Note that this procedure is incorrect for insert and extract element + // instructions (because combining these often results in a shuffle), + // but this cost is ignored (because insert and extract element + // instructions are assigned a zero depth factor and are not really + // fused in general). unsigned VCost = getInstrCost(I->getOpcode(), VT1, VT2); if (VCost > ICost + JCost) |
