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author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-07-12 19:16:07 +0000 |
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committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-07-12 19:16:07 +0000 |
commit | 7251a75f6ee9ce38263be6580a235187475458ed (patch) | |
tree | 1d03dbeaf96d78842d28a8cae7111b0cb11cf7fd /lib/Target/X86/X86TargetTransformInfo.cpp | |
parent | 4a1c764264a8908aa041acf12f68cd8bcc2037b1 (diff) | |
download | llvm-7251a75f6ee9ce38263be6580a235187475458ed.tar.gz llvm-7251a75f6ee9ce38263be6580a235187475458ed.tar.bz2 llvm-7251a75f6ee9ce38263be6580a235187475458ed.tar.xz |
X86 cost model: Add cost for vectorized gather/scather
radar://14351991
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186189 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86TargetTransformInfo.cpp')
-rw-r--r-- | lib/Target/X86/X86TargetTransformInfo.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/Target/X86/X86TargetTransformInfo.cpp b/lib/Target/X86/X86TargetTransformInfo.cpp index 68e1a67243..3bbddadca8 100644 --- a/lib/Target/X86/X86TargetTransformInfo.cpp +++ b/lib/Target/X86/X86TargetTransformInfo.cpp @@ -100,6 +100,8 @@ public: unsigned Alignment, unsigned AddressSpace) const; + virtual unsigned getAddressComputationCost(Type *PtrTy, bool IsComplex) const; + /// @} }; @@ -598,3 +600,16 @@ unsigned X86TTI::getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment, return Cost; } + +unsigned X86TTI::getAddressComputationCost(Type *Ty, bool IsComplex) const { + // Address computations in vectorized code with non-consecutive addresses will + // likely result in more instructions compared to scalar code where the + // computation can more often be merged into the index mode. The resulting + // extra micro-ops can significantly decrease throughput. + unsigned NumVectorInstToHideOverhead = 10; + + if (Ty->isVectorTy() && IsComplex) + return NumVectorInstToHideOverhead; + + return TargetTransformInfo::getAddressComputationCost(Ty, IsComplex); +} |