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arm: add support for detecting NEON (WIP) #144

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arm: add support for detecting NEON (WIP) #144

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Commits on Dec 11, 2022

  1. arm: add support for detecting SIMD (NEON) availability (WIP) 

    Requires getauxval() which is available at least in Linux/Android
with recent versions of the libc and that is therefore behind a
configure like macro.

A similar function from FreeBSD>=12, Windows and NetBSD is used
for each case.

While at it, consolidate the code to use the same externally
visible flag that is used in x86 for SSE2.
    @carenas
    carenas committed Dec 11, 2022
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