[PATCH] D157680: [X86]Support options -mno-gather -mno-scatter

[Wang, Xin via Phabricator via cfe-commits]

XinWang10 created this revision.
Herald added subscribers: pengfei, hiraditya.
Herald added a project: All.
XinWang10 requested review of this revision.
Herald added subscribers: llvm-commits, cfe-commits, wangpc, MaskRay.
Herald added projects: clang, LLVM.

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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157680

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/x86-no-gather-no-scatter.cpp
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86TargetTransformInfo.cpp
  llvm/lib/Target/X86/X86TargetTransformInfo.h
  llvm/test/CodeGen/X86/x86-prefer-no-gather-no-scatter.ll

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