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[Bug math/21967] When 512-bit AVX2 wrapper functions in mathvec are used?


https://sourceware.org/bugzilla/show_bug.cgi?id=21967

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
avx2_wrapper is supposed to be used when AVX512F isn't profitable.  But
with

  if (CPU_FEATURES_ARCH_P (cpu_features, AVX512DQ_Usable))
    return OPTIMIZE (skx);

  if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable))
    return OPTIMIZE (knl);

it is never used.  There is a Prefer_No_AVX512 bit in cpu_features.  But
we don't want to use it here since it will disable AVX512 mathvec on Skylake
server.  We need a separate bit to control AVX512 mathvec.

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