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[Bug target/82942] Generate vzeroupper with -mavx512f -mno-avx512er -O2


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82942

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 42584
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42584&action=edit
An untested patch

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