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| author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2014-03-28 17:21:32 +0000 |
|---|---|---|
| committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2014-03-28 17:21:32 +0000 |
| commit | ce3623782657d77cefbd03ab0d545a0805e9c5e9 (patch) | |
| tree | 0b58669f05abafdadeee4b15da83e55acf1b2d04 /lib/Transforms | |
| parent | aa0a2a35f830e3bc2078c0054349a102b4444ea4 (diff) | |
| download | llvm-ce3623782657d77cefbd03ab0d545a0805e9c5e9.tar.gz llvm-ce3623782657d77cefbd03ab0d545a0805e9c5e9.tar.bz2 llvm-ce3623782657d77cefbd03ab0d545a0805e9c5e9.tar.xz | |
SLPVectorizer: Take credit for free extractelement instructions
Extract element instructions that will be removed when vectorzing lower the
cost.
Patch by Arch D. Robison!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205020 91177308-0d34-0410-b5e6-96231b3b80d8
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: |