[all-commits] [llvm/llvm-project] 03744d: [Clang] Remove 3-element vector load and store spe...

[Shilei Tian via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 03744d2aaffee04bc1e4d0668c41556c3c20d406
      https://github.com/llvm/llvm-project/commit/03744d2aaffee04bc1e4d0668c41556c3c20d406
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2025-01-21 (Tue, 21 Jan 2025)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Basic/LangOptions.def
    M clang/include/clang/Driver/Options.td
    M clang/lib/Basic/LangOptions.cpp
    M clang/lib/CodeGen/ABIInfo.cpp
    M clang/lib/CodeGen/ABIInfo.h
    M clang/lib/CodeGen/CGExpr.cpp
    M clang/lib/CodeGen/Targets/AMDGPU.cpp
    M clang/test/CodeGenCXX/matrix-vector-bit-int.cpp
    M clang/test/CodeGenOpenCL/amdgpu-alignment.cl
    M clang/test/CodeGenOpenCL/preserve_vec3.cl

  Log Message:
  -----------
  [Clang] Remove 3-element vector load and store special handling (#104661)

Clang uses a long-time special handling of the case where 3 element
vector loads and stores are performed as 4 element, and then a
shufflevector is used to extract the used elements. Odd sized vector
codegen should now work reasonably well.

This patch removes the compiler argument `-fpreserve-vec3-type` and adds
a target hook to determine if the special handling of vector type is
needed.

---------

Co-authored-by: Matt Arsenault <Matthew.Arsenault at amd.com>



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