qsimd_p.h: document that AMD Zen4 supports AVX512
See https://www.mersenneforum.org/showthread.php?p=614191 Change-Id: I810d70e579eb4e2c8e45fffd1719b166daf555e1 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io> (cherry picked from commit fee7844759f3c1dbc8a00139d923211990a07775) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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@ -223,8 +223,10 @@ static_assert(ARCH_HASWELL_MACROS, "Undeclared identifiers indicate which featur
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// x86-64 sub-architecture version 4
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//
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// Similar to the above, x86-64-v4 marches the AVX512 variant of the Intel Core
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// 6th generation (codename "Skylake").
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// Similar to the above, x86-64-v4 matches the AVX512 variant of the Intel Core
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// 6th generation (codename "Skylake"). AMD Zen4 is the their first processor
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// with AVX512 support and it includes all of these too.
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//
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# define ARCH_SKX_MACROS (__AVX512F__ + __AVX512BW__ + __AVX512CD__ + __AVX512DQ__ + __AVX512VL__)
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# if ARCH_SKX_MACROS != 0
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# if ARCH_SKX_MACROS != 5
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