diff options
Diffstat (limited to 'lib/Transforms')
-rw-r--r-- | lib/Transforms/Vectorize/SLPVectorizer.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp index 6d1c2c0ffe..d2d4db33f6 100644 --- a/lib/Transforms/Vectorize/SLPVectorizer.cpp +++ b/lib/Transforms/Vectorize/SLPVectorizer.cpp @@ -1015,8 +1015,17 @@ int BoUpSLP::getEntryCost(TreeEntry *E) { return 0; } case Instruction::ExtractElement: { - if (CanReuseExtract(VL)) - return 0; + if (CanReuseExtract(VL)) { + int DeadCost = 0; + for (unsigned i = 0, e = VL.size(); i < e; ++i) { + ExtractElementInst *E = cast<ExtractElementInst>(VL[i]); + if (E->hasOneUse()) + // Take credit for instruction that will become dead. + DeadCost += + TTI->getVectorInstrCost(Instruction::ExtractElement, VecTy, i); + } + return -DeadCost; + } return getGatherCost(VecTy); } case Instruction::ZExt: |