[PATCH] D27811: [CostModel][X86] Add support for broadcast shuffle costs

[Elena Demikhovsky via Phabricator via llvm-commits]

delena added inline comments.


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Comment at: lib/Target/X86/X86TargetTransformInfo.cpp:683
+      { TTI::SK_Broadcast, MVT::v8i32,  2 }, // vperm2f128 + vpermilps
+      { TTI::SK_Broadcast, MVT::v16i16, 3 }, // vpshuflw + vpshufd + vinsertf128
+      { TTI::SK_Broadcast, MVT::v32i8,  2 }, // vpshufb + vinsertf128
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theoretically, v16i16 should not be more expensive than v32i8, vpshufb should work for v8i16 as it works for v16i8. (I don't know how it is implemented).


Repository:
  rL LLVM

https://reviews.llvm.org/D27811