[all-commits] [llvm/llvm-project] 993bdb: [X86]Support options -mno-gather -mno-scatter

[XinWang10 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 993bdb047c90e9b85fb91578349a9faf4f6a853d
      https://github.com/llvm/llvm-project/commit/993bdb047c90e9b85fb91578349a9faf4f6a853d
  Author: XinWang10 <xin10.wang at intel.com>
  Date:   2023-08-17 (Thu, 17 Aug 2023)

  Changed paths:
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Arch/X86.cpp
    A clang/test/Driver/x86-no-gather-no-scatter.cpp
    M llvm/lib/Target/X86/X86.td
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/lib/Target/X86/X86TargetTransformInfo.h
    A llvm/test/CodeGen/X86/x86-prefer-no-gather-no-scatter.ll

  Log Message:
  -----------
  [X86]Support options -mno-gather -mno-scatter

Gather instructions could lead to security issues, details please refer to https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/gather-data-sampling.html.
This supported options -mno-gather and -mno-scatter, which could avoid generating gather/scatter instructions in backend except using intrinsics or inline asms.

Reviewed By: pengfei

Differential Revision: https://reviews.llvm.org/D157680