[all-commits] [llvm/llvm-project] f0eb55: Remove support for 3DNow!, both intrinsics and bui...

[James Y Knight via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f0eb5587ceeb641445b64cb264c822b4751de04a
      https://github.com/llvm/llvm-project/commit/f0eb5587ceeb641445b64cb264c822b4751de04a
  Author: James Y Knight <jyknight at google.com>
  Date:   2024-07-16 (Tue, 16 Jul 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/BuiltinsX86.def
    M clang/include/clang/Driver/Options.td
    M clang/lib/Basic/Targets/X86.cpp
    M clang/lib/Basic/Targets/X86.h
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/Driver/ToolChains/Arch/X86.cpp
    M clang/lib/Headers/mm3dnow.h
    M clang/lib/Headers/x86intrin.h
    R clang/test/CodeGen/X86/3dnow-builtins.c
    M clang/test/CodeGen/builtins-x86.c
    M clang/test/Driver/x86-target-features.c
    M clang/test/Headers/mm3dnow.c
    M clang/test/Preprocessor/predefined-arch-macros.c
    M clang/test/Preprocessor/x86_target_features.c
    M llvm/docs/ReleaseNotes.rst
    M llvm/include/llvm/IR/IntrinsicsX86.td
    M llvm/lib/Target/X86/X86.td
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/lib/Target/X86/X86Instr3DNow.td
    M llvm/lib/Target/X86/X86InstrPredicates.td
    M llvm/lib/Target/X86/X86Subtarget.cpp
    M llvm/lib/Target/X86/X86Subtarget.h
    R llvm/test/CodeGen/X86/3dnow-intrinsics.ll
    R llvm/test/CodeGen/X86/commute-3dnow.ll
    M llvm/test/CodeGen/X86/expand-vr64-gr64-copy.mir
    M llvm/test/CodeGen/X86/pr35982.ll
    M llvm/test/CodeGen/X86/prefetch.ll
    R llvm/test/CodeGen/X86/stack-folding-3dnow.ll

  Log Message:
  -----------
  Remove support for 3DNow!, both intrinsics and builtins. (#96246)

This set of instructions was only supported by AMD chips starting in
the K6-2 (introduced 1998), and before the "Bulldozer" family
(2011). They were never much used, as they were effectively superseded
by the more-widely-implemented SSE (first implemented on the AMD side
in Athlon XP in 2001).

This is being done as a predecessor towards general removal of MMX
register usage. Since there is almost no usage of the 3DNow!
intrinsics, and no modern hardware even implements them, simple
removal seems like the best option.

(Clang half originally uploaded in https://reviews.llvm.org/D94213)

Works towards issue #41665 and issue #98272.



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