[PATCH] D159250: [X86][RFC] Add new option `-m[no-]evex512` to disable ZMM and 64-bit mask instructions for AVX512 features

[Phoebe Wang via Phabricator via llvm-commits]

pengfei created this revision.
pengfei added reviewers: RKSimon, skan, jyknight, e-kud.
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Herald added projects: clang, LLVM.
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This is an alternative of D157485 <https://reviews.llvm.org/D157485> and a pre-feature to support AVX10.

AVX10 Architecture Specification: https://cdrdv2.intel.com/v1/dl/getContent/784267
AVX10 Technical Paper: https://cdrdv2.intel.com/v1/dl/getContent/784343
RFC: https://discourse.llvm.org/t/rfc-design-for-avx10-feature-support/72661

Based on the feedbacks from LLVM and GCC community, we have agreed to
start from supporting `-m[no-]evex512` on existing AVX512 features.
The option `-mno-evex512` can be used with `-mavx512xxx` to build
binaries that can run on both legacy AVX512 targets and AVX10-256.

There're still arguments about what's the expected behavior when this
option as well as `-mavx512xxx` used together with `-mavx10.1-256`. We
decided to defer the support of `-mavx10.1` after we made consensus.
Or furthermore, we start from supporting AVX10.2 and not providing any
AVX10.1 options.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159250

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Basic/Targets/X86.h
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/lib/CodeGen/CodeGenFunction.cpp
  clang/lib/CodeGen/CodeGenFunction.h
  clang/lib/CodeGen/Targets/X86.cpp
  clang/test/CodeGen/X86/avx512-error.c
  clang/test/CodeGen/attr-cpuspecific.c
  clang/test/CodeGen/attr-target-x86.c
  clang/test/CodeGen/regcall2.c
  clang/test/CodeGen/target-avx-abi-diag.c
  clang/test/Driver/x86-target-features.c
  clang/test/Preprocessor/x86_target_features.c
  llvm/include/llvm/TargetParser/X86TargetParser.def
  llvm/lib/IR/Verifier.cpp
  llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86InstrInfo.td
  llvm/lib/Target/X86/X86RegisterInfo.cpp
  llvm/lib/Target/X86/X86Subtarget.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/TargetParser/X86TargetParser.cpp
  llvm/test/CodeGen/X86/avx512bwvl-arith.ll
  llvm/test/CodeGen/X86/avx512vl-arith.ll

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