SuccessChanges

Summary

  1. [X86] Add support for -mvzeroupper and -mno-vzeroupper to match gcc (details)
Commit b2b6a54f847f33f821f41e3e82bf3b86e08817a0 by craig.topper
[X86] Add support for -mvzeroupper and -mno-vzeroupper to match gcc
-mvzeroupper will force the vzeroupper insertion pass to run on CPUs
that normally wouldn't. -mno-vzeroupper disables it on CPUs where it
normally runs.
To support this with the default feature handling in clang, we need a
vzeroupper feature flag in X86.td. Since this flag has the opposite
polarity of the fast-partial-ymm-or-zmm-write we used to use to disable
the pass, we now need to add this new flag to every CPU except KNL/KNM
and BTVER2 to keep identical behavior.
Remove -fast-partial-ymm-or-zmm-write which is no longer used.
Differential Revision: https://reviews.llvm.org/D69786
The file was modifiedllvm/docs/ReleaseNotes.rst
The file was modifiedllvm/lib/Target/X86/X86TargetTransformInfo.h
The file was modifiedllvm/lib/Target/X86/X86VZeroUpper.cpp
The file was modifiedllvm/lib/Target/X86/X86.td
The file was modifiedllvm/lib/Target/X86/X86Subtarget.h
The file was modifiedclang/test/Driver/x86-target-features.c
The file was modifiedllvm/test/CodeGen/X86/avx-vzeroupper.ll
The file was modifiedclang/docs/ReleaseNotes.rst
The file was modifiedclang/include/clang/Driver/Options.td