[all-commits] [llvm/llvm-project] 1ad4f8: [CostModel][X86] Improve accuracy of vector non-un...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ad4f887bd7692a9e63fb42586f0ece366f2fe01
      https://github.com/llvm/llvm-project/commit/1ad4f887bd7692a9e63fb42586f0ece366f2fe01
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-05-24 (Mon, 24 May 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/X86/div.ll
    M llvm/test/Analysis/CostModel/X86/fshl.ll
    M llvm/test/Analysis/CostModel/X86/fshr.ll
    M llvm/test/Analysis/CostModel/X86/rem.ll
    M llvm/test/Analysis/CostModel/X86/vshift-ashr-cost-inseltpoison.ll
    M llvm/test/Analysis/CostModel/X86/vshift-ashr-cost.ll
    M llvm/test/Analysis/CostModel/X86/vshift-lshr-cost-inseltpoison.ll
    M llvm/test/Analysis/CostModel/X86/vshift-lshr-cost.ll
    M llvm/test/Analysis/CostModel/X86/vshift-shl-cost-inseltpoison.ll
    M llvm/test/Analysis/CostModel/X86/vshift-shl-cost.ll
    M llvm/test/Transforms/VectorCombine/X86/insert-binop-with-constant-inseltpoison.ll
    M llvm/test/Transforms/VectorCombine/X86/insert-binop-with-constant.ll

  Log Message:
  -----------
  [CostModel][X86] Improve accuracy of vector non-uniform shift costs on XOP/AVX2 targets

By llvm-mca analysis, Haswell/Broadwell has a non-uniform vector shift recip-throughput cost of the AVX2 targets at 2 for both 128 and 256-bit vectors - XOP capable targets have better 128-bit vector shifts so improve the fallback in those cases.