[all-commits] [llvm/llvm-project] 04db60: [AMDGPU] Prevent hang in SIFoldOperands by caching...

[choikwa via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 04db60d15069494f4effad7a1001965904b36e6f
      https://github.com/llvm/llvm-project/commit/04db60d15069494f4effad7a1001965904b36e6f
  Author: choikwa <5455710+choikwa at users.noreply.github.com>
  Date:   2024-02-27 (Tue, 27 Feb 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    A llvm/test/CodeGen/AMDGPU/si-fold-reg-sequence.mir

  Log Message:
  -----------
  [AMDGPU] Prevent hang in SIFoldOperands by caching uses (#82099)

foldOperands() for REG_SEQUENCE has recursion that can trigger an infinite loop
as the method can modify the operand order, which messes up the range-based
for loop. This patch fixes the issue by caching the uses for processing beforehand,
and then iterating over the cache rather using the instruction iterator.



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