[all-commits] [llvm/llvm-project] 228ef8: [X86] Return more accurate getNumSupportedRegs() (...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 228ef85b5b6a4a42effdff7e229decabe8698797
      https://github.com/llvm/llvm-project/commit/228ef85b5b6a4a42effdff7e229decabe8698797
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2023-11-09 (Thu, 09 Nov 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86RegisterInfo.cpp

  Log Message:
  -----------
  [X86] Return more accurate getNumSupportedRegs() (NFC) (#71690)

https://github.com/llvm/llvm-project/pull/70222 introduced a hook to
return a more accurate number of registers supported for a specific
subtarget (rather than target). However, while x86 registers were
reordered to allow using this, the implementation currently still always
returns NUM_TARGET_REGS.

Adjust it to return a smaller number of registers depending on
availability of avx/avx512/amx.

The actual impact of this seems to be pretty small, on the order of
0.05%.