[all-commits] [llvm/llvm-project] 51107b: [X86] Haswell/Broadwell/Skylake DPPS folded instru...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 51107be7dd7f83a107b9c35c39b16081e38f7a54
      https://github.com/llvm/llvm-project/commit/51107be7dd7f83a107b9c35c39b16081e38f7a54
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-04-03 (Wed, 03 Apr 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86SchedBroadwell.td
    M llvm/lib/Target/X86/X86SchedHaswell.td
    M llvm/lib/Target/X86/X86SchedSkylakeClient.td
    M llvm/lib/Target/X86/X86SchedSkylakeServer.td
    M llvm/test/tools/llvm-mca/X86/Broadwell/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/Broadwell/resources-sse41.s
    M llvm/test/tools/llvm-mca/X86/Haswell/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/Haswell/resources-sse41.s
    M llvm/test/tools/llvm-mca/X86/SkylakeClient/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/SkylakeClient/resources-sse41.s
    M llvm/test/tools/llvm-mca/X86/SkylakeServer/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/SkylakeServer/resources-sse41.s

  Log Message:
  -----------
  [X86] Haswell/Broadwell/Skylake DPPS folded instructions use an extra port06 resource

This is an extension to 07151f0241d3f893cb36eb2dbc395d4098f74a87 which handled SandyBridge so we at least model the regression identified in #14640

Confirmed by Agner + uops.info/uica (SkylakeServer also had an incorrect use of Port015 instead of just Port01)

I raised #86669 as a proposal for a 'x86 unfold' pass that can unfold these (if we have the free registers) driven by the scheduler model.



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