[all-commits] [llvm/llvm-project] 86154e: Reapply "[GlobalISel] Add a shared matcher for mem...

[Cullen Rhodes via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 86154e8fd0d45825a4753b973312b78944b3d38c
      https://github.com/llvm/llvm-project/commit/86154e8fd0d45825a4753b973312b78944b3d38c
  Author: Cullen Rhodes <cullen.rhodes at arm.com>
  Date:   2026-06-11 (Thu, 11 Jun 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
    M llvm/include/llvm/CodeGen/GlobalISel/Utils.h
    M llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
    M llvm/lib/CodeGen/GlobalISel/Utils.cpp

  Log Message:
  -----------
  Reapply "[GlobalISel] Add a shared matcher for memcpy-family instructions (NFC)" (#202275) (#202298)

sanitizer-aarch64-linux-bootstrap-ubsan broke after #201766:
lab.llvm.org/buildbot/#/builders/85/builds/22356

  failed tests:
    LLVM :: CodeGen/AArch64/aarch64-mops.ll
    LLVM :: CodeGen/AArch64/memsize-remarks.ll

The culprit is canLowerMemCpyFamily returning true for zero-length ops
before initializing IsVolatile. The memcpy-family lowering helpers don't
use IsVolatile, it's only needed while building the lowering plan with
findGISelOptimalMemOpLowering and shouldn't have been forwarded.

I've also check the other arguments and simplified alignment too.

This reverts commit 2de2edb943fe1b83d79bdffa03606eb8c5452e9b.



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