[all-commits] [llvm/llvm-project] f85250: [CodeGen] Don't include aliases in RegisterClassIn...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f8525030004f907cd108e7c18df255a6d3b23124
      https://github.com/llvm/llvm-project/commit/f8525030004f907cd108e7c18df255a6d3b23124
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2024-01-31 (Wed, 31 Jan 2024)

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

  Log Message:
  -----------
  [CodeGen] Don't include aliases in RegisterClassInfo::IgnoreCSRForAllocOrder (#80015)

Previously we called ignoreCSRForAllocationOrder on every alias of every
CSR which was expensive on targets like AMDGPU which define a very large
number of overlapping register tuples.

On such targets it is simpler and faster to call
ignoreCSRForAllocationOrder once for every physical register.

Differential Revision: https://reviews.llvm.org/D146735