[all-commits] [llvm/llvm-project] d66f65: [MachinePipeliner] Skip reserved registers when co...

[Pengcheng Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d66f653c8db90d0c643f8f2740bbdc01bf647f18
      https://github.com/llvm/llvm-project/commit/d66f653c8db90d0c643f8f2740bbdc01bf647f18
  Author: Pengcheng Wang <wangpengcheng.pp at bytedance.com>
  Date:   2024-12-20 (Fri, 20 Dec 2024)

  Changed paths:
    M llvm/lib/CodeGen/MachinePipeliner.cpp

  Log Message:
  -----------
  [MachinePipeliner] Skip reserved registers when computing register pressure (#120694)

We used to skip fixed registers, but fixed registers are not enough
because there are some runtime unusable registers like registers
reserved by `-ffixed-xxx` options.

Here we change to use reserved registers so that the estimated
pressure is more accurate.



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