[Bug target/101456] Unnecessary vzeroupper when upper bits of YMM registers already zero

[arjan at linux dot intel.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101456

Arjan van de Ven <arjan at linux dot intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |arjan at linux dot intel.com

--- Comment #1 from Arjan van de Ven <arjan at linux dot intel.com> ---
Actually it's not that they're zero (they are) but they're in "init" state
since the vpxor wrote to xmm not ymm