[all-commits] [llvm/llvm-project] 8c83bd: [CostModel][X86] Adjust vXi32 multiply costs if it...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8c83bd3bd4c482b22abf7468687269ba010d36e4
      https://github.com/llvm/llvm-project/commit/8c83bd3bd4c482b22abf7468687269ba010d36e4
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-09-25 (Sat, 25 Sep 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/X86/mul32.ll
    M llvm/test/Analysis/CostModel/X86/slm-arith-costs.ll
    M llvm/test/Transforms/LoopVectorize/X86/mul_slm_16bit.ll

  Log Message:
  -----------
  [CostModel][X86] Adjust vXi32 multiply costs if it can be performed using PMADDWD

Update the costs to match the codegen from combineMulToPMADDWD - not only can we use PMADDWD is its zero-extended, but also if its a constant or sign-extended from a vXi16 (which can be replaced with a zero-extension).