[PATCH] D69786: [X86] Add support for -mvzeroupper and -mno-vzeroupper to match gcc.
Craig Topper via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Sun Nov 3 23:01:54 PST 2019
craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.
Herald added subscribers: cfe-commits, jfb, hiraditya.
Herald added projects: clang, LLVM.
craig.topper added a reviewer: davezarzycki.
-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
Remove -fast-partial-ymm-or-zmm-write which is no longer used.
rG LLVM Github Monorepo
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