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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101456] Unnecessary vzeroupper when upper bits of YMM
 registers already zero
Date: Tue, 15 Feb 2022 13:42:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101456

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2022-02-15

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
It turns out that reading YMM registers with all zero bits needs VZEROUPPER
on Sandy Bride, Ivy Bridge, Haswell, Broadwell and Alder Lake to avoid
SSE <-> AVX transition penalty.=