[all-commits] [llvm/llvm-project] 0d849b: AMDGPU: Skip folding REG_SEQUENCE if found unknown...

[Christudasan Devadasan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0d849b8249e8d25484cab3e6aaba3cbcddc408dd
      https://github.com/llvm/llvm-project/commit/0d849b8249e8d25484cab3e6aaba3cbcddc408dd
  Author: Christudasan Devadasan <Christudasan.Devadasan at amd.com>
  Date:   2022-03-08 (Tue, 08 Mar 2022)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    A llvm/test/CodeGen/AMDGPU/skip-fold-regsequence.mir

  Log Message:
  -----------
  AMDGPU: Skip folding REG_SEQUENCE if found unknown regclasses for its users

Use TII::getRegClass to return a valid regclass or a nullptr
if the RC is unknown for a given OpIdx. This fixes a potential
crash occurred while getting the RC from a variadic instruction.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D120813