[all-commits] [llvm/llvm-project] 07151f: [X86] SandyBridge DPPS folded instructions use an ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 07151f0241d3f893cb36eb2dbc395d4098f74a87
      https://github.com/llvm/llvm-project/commit/07151f0241d3f893cb36eb2dbc395d4098f74a87
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-09-22 (Fri, 22 Sep 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86SchedSandyBridge.td
    M llvm/test/tools/llvm-mca/X86/Generic/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/Generic/resources-sse41.s
    M llvm/test/tools/llvm-mca/X86/SandyBridge/resources-avx1.s
    M llvm/test/tools/llvm-mca/X86/SandyBridge/resources-sse41.s

  Log Message:
  -----------
  [X86] SandyBridge DPPS folded instructions use an extra port5 resource

Noticed while trying to workout some discrepancies between a llvm-mca and uica analysis - confirmed with a llvm-exegesis capture (and matches uops.info numbers)

This appears to be the reason behind Issue #14640 as well (heavy use of port5).