[RFC] How to add vector math functions to Glibc

[Andrew Senkevich]

Hi Joseph,

attached patch now contain versions of vector cos in SSE4, AVX and AVX2 ISAs.

Because of both AVX and AVX2 versions have vector length 4 there are
some changes in tests - I put AVX2 make rules in sysdeps makefile and
its name changed to test-double-vlen4-avx2 , AVX test stay with old
name, in ULPs file specified both versions.

If everything is okey, let me know and I will prepare separated
patches while document about pragma meaning is preparing (we plan to
add it at last steps).


--
WBR,
Andrew
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