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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2016-11-08 14:10:28 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2016-11-08 14:10:28 +0000 |
| commit | d02c55204ba16b0633dc1fd94ae0dc0deffc8fc4 (patch) | |
| tree | e90db63184df442cbf2298e594b26384df81af3e /llvm/lib/Target/X86/X86TargetTransformInfo.cpp | |
| parent | 89fd151ee02d482677f2331eee574ad00179e897 (diff) | |
| download | bcm5719-llvm-d02c55204ba16b0633dc1fd94ae0dc0deffc8fc4.tar.gz bcm5719-llvm-d02c55204ba16b0633dc1fd94ae0dc0deffc8fc4.zip | |
[VectorLegalizer] Expansion of CTLZ using CTPOP when possible
This patch avoids scalarization of CTLZ by instead expanding to use CTPOP (ref: "Hacker's Delight") when the necessary operations are available.
This also adds the necessary cost models for X86 SSE2 targets (the main beneficiary) to ensure vectorization only happens when its useful.
Differential Revision: https://reviews.llvm.org/D25910
llvm-svn: 286233
Diffstat (limited to 'llvm/lib/Target/X86/X86TargetTransformInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86TargetTransformInfo.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp index afa8e00b2f7..7029a02e682 100644 --- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp +++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp @@ -1214,7 +1214,10 @@ int X86TTIImpl::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy, { ISD::BSWAP, MVT::v2i64, 7 }, { ISD::BSWAP, MVT::v4i32, 7 }, { ISD::BSWAP, MVT::v8i16, 7 }, - /* ISD::CTLZ - currently scalarized pre-SSSE3 */ + { ISD::CTLZ, MVT::v2i64, 25 }, + { ISD::CTLZ, MVT::v4i32, 26 }, + { ISD::CTLZ, MVT::v8i16, 20 }, + { ISD::CTLZ, MVT::v16i8, 17 }, { ISD::CTPOP, MVT::v2i64, 12 }, { ISD::CTPOP, MVT::v4i32, 15 }, { ISD::CTPOP, MVT::v8i16, 13 }, |
