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| author | Nadav Rotem <nrotem@apple.com> | 2012-12-28 08:19:03 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-12-28 08:19:03 +0000 |
| commit | ae34b4280ebde6217706902e8a27bb858765a61c (patch) | |
| tree | 95b5705d9253667a4efec2489bd1ba61695fe03f /lib/Target/X86/X86ISelLowering.cpp | |
| parent | 40ef8b75487ad9f98a93b1dbf283a25658ef8a1e (diff) | |
| download | llvm-ae34b4280ebde6217706902e8a27bb858765a61c.tar.gz llvm-ae34b4280ebde6217706902e8a27bb858765a61c.tar.bz2 llvm-ae34b4280ebde6217706902e8a27bb858765a61c.tar.xz | |
CostModel: initial checkin for code that estimates the cost of special shuffles.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171180 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index e5122abd4b..5d495a68ed 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -18237,3 +18237,19 @@ unsigned X86VectorTargetTransformInfo::getCastInstrCost(unsigned Opcode, return VectorTargetTransformImpl::getCastInstrCost(Opcode, Dst, Src); } + +unsigned X86VectorTargetTransformInfo::getShuffleCost(ShuffleKind Kind, Type *Tp, + int Index) const { + // We only estimate the cost of reverse shuffles. + if (Kind != Reverse) + return VectorTargetTransformImpl::getShuffleCost(Kind, Tp, Index); + + std::pair<unsigned, MVT> LT = getTypeLegalizationCost(Tp); + unsigned Cost = 1; + if (LT.second.getSizeInBits() > 128) + Cost = 3; // Extract + insert + copy. + + // Multiple by the number of parts. + return Cost * LT.first; +} + |