[all-commits] [llvm/llvm-project] 08e5e9: [X86] Remove [ER]SP from all CSR lists

[Reid Kleckner via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 08e5e91e45af96e564f3c19be7ed4cb00bac3034
      https://github.com/llvm/llvm-project/commit/08e5e91e45af96e564f3c19be7ed4cb00bac3034
  Author: Reid Kleckner <rnk at google.com>
  Date:   2021-01-06 (Wed, 06 Jan 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86CallingConv.td
    M llvm/test/CodeGen/X86/avx512-regcall-Mask.ll
    M llvm/test/CodeGen/X86/avx512-regcall-NoMask.ll
    M llvm/test/CodeGen/X86/dynamic-regmask.ll
    M llvm/test/CodeGen/X86/ipra-reg-usage.ll

  Log Message:
  -----------
  [X86] Remove [ER]SP from all CSR lists

The CSR lists control which registers are spilled and reloaded in the
prologue and epilogue. The stack pointer is managed explicitly, and
should never be pushed or popped. Remove it from these lists. This
affected regcall and preserves all / most.

Differential Revision: https://reviews.llvm.org/D94118