[PATCH] D69500: [X86] NFC: Convert LLVM command-line flag to target attribute

[David Zarzycki via Phabricator via llvm-commits]

davezarzycki created this revision.
davezarzycki added reviewers: craig.topper, RKSimon, spatel.
davezarzycki added a project: LLVM.

Swift and perhaps other users of LLVM do not leave `cl::opt` style command-line option parsing enabled due to C++ global constructor overhead, therefore let's convert the VZEROUPPER option to a target attribute.

      

Furthermore, this change stops the conflation of VZEROUPPER emission with enabling/disabling fast partial YMM/ZMM updates. The compiler doesn't intentionally emit partial updates at the moment, but it could.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D69500

Files:
  lib/Target/X86/X86.td
  lib/Target/X86/X86Subtarget.h
  lib/Target/X86/X86TargetMachine.cpp
  lib/Target/X86/X86TargetTransformInfo.h
  lib/Target/X86/X86VZeroUpper.cpp
  test/CodeGen/X86/avx-vzeroupper.ll

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