[all-commits] [llvm/llvm-project] 3100b5: [AMDGPU] Flatten recursive register resource info ...

[Janek van Oirschot via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3100b50f78c06dcd5207140e0d6e5ba6954d8828
      https://github.com/llvm/llvm-project/commit/3100b50f78c06dcd5207140e0d6e5ba6954d8828
  Author: Janek van Oirschot <janek.vanoirschot at amd.com>
  Date:   2025-06-12 (Thu, 12 Jun 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUMCResourceInfo.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUMCResourceInfo.h
    M llvm/test/CodeGen/AMDGPU/function-resource-usage.ll
    M llvm/test/CodeGen/AMDGPU/recursive-resource-usage-mcexpr.ll

  Log Message:
  -----------
  [AMDGPU] Flatten recursive register resource info propagation (#142766)

In #112251 I had mentioned I'd follow up with flattening of recursion
for register resource info propagation

Behaviour prior to this patch when a recursive call is used is to take
the module scope worst case function register use (even prior to
AMDGPUMCResourceInfo). With this patch it will, when a cycle is
detected, attempt to do a simple cycle avoidant dfs to find the worst
case constant within the cycle and the cycle's propagates. In other
words, it will attempt to look for the cycle scope worst case rather
than module scope worst case.



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