[all-commits] [llvm/llvm-project] 1650e4: [X86] Remove TuningPOPCNTFalseDeps from AlderLake ...

[Aiden Grossman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1650e4a73c4363a7a98a29c9a181dee57ce0ba64
      https://github.com/llvm/llvm-project/commit/1650e4a73c4363a7a98a29c9a181dee57ce0ba64
  Author: Aiden Grossman <aidengrossman at google.com>
  Date:   2025-08-18 (Mon, 18 Aug 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86.td
    M llvm/test/CodeGen/X86/bitcnt-false-dep.ll

  Log Message:
  -----------
  [X86] Remove TuningPOPCNTFalseDeps from AlderLake (#154004)

This false dependency issue was fixed in CannonLake looking at the data
from uops.info. This is confirmed not to be an issue based on
benchmarking data in #153983. Setting this can potentially lead to extra
xor instructions whihc could consume extra frontend/renaming resources.

None of the other CPUs that have had this fixed have the tuning flag.

Fixes #153983.



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