[PATCH] D115016: [CostModel][X86] Add i64 mul cost for avx as 1cy

[Haohai, Wen via Phabricator via llvm-commits]

HaohaiWen added a comment.

> Another problem, do we need to add check for 64Bit?

TLI->getTypeLegalizationCost(DL, Ty) for i64 is i32. Therefore mul i64, i64 on 32bit target will match X86CostTbl.

  opt --analyze -cost-model fuzz.ll -mcpu=skylake-avx512  -mtriple=i386--
  Cost Model: Found an estimated cost of 2 for instruction:   %result = mul i64 %a0, %a1


Repository:
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  https://reviews.llvm.org/D115016/new/

https://reviews.llvm.org/D115016