[all-commits] [llvm/llvm-project] 67f685: [CIR] Lower __builtin_memcpy/mempcpy to cir.libc.m...

[Mariya Podchishchaeva via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 67f685af1b364056fd59fc42841d7f428d46ee1a
      https://github.com/llvm/llvm-project/commit/67f685af1b364056fd59fc42841d7f428d46ee1a
  Author: Mariya Podchishchaeva <Mariya.Podchishchaeva at amd.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    M clang/lib/CIR/CodeGen/CIRGenAtomic.cpp
    M clang/lib/CIR/CodeGen/CIRGenBuilder.h
    M clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp
    M clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
    M clang/test/CIR/CodeGen/assign-operator.cpp
    M clang/test/CIR/CodeGen/atomic.c
    A clang/test/CIR/CodeGen/builtin-memcpy.c
    M clang/test/CIR/CodeGen/libc.c
    M clang/test/CIR/CodeGen/union-copy-move-assignment.cpp
    M clang/test/CIR/CodeGenBuiltins/builtin-bit-cast.cpp

  Log Message:
  -----------
  [CIR] Lower __builtin_memcpy/mempcpy to cir.libc.memcpy (#225845)

These previously were lowered to a call to undefined memcpy function
which caused link failures when compiled for AMDGPU since there it is
never resolved to a library function.
cir.libc.memcpy is later lowered to llvm.memcpy intrinsic call which
matches classic codegen.
This also adds alignment attributes to cir.libc.memcpy op so resulting
LLVM IR also has them just like LLVM IR produced by the classic codegen

Assisted by: claude



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