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(Mostly) Implementation-agnostic SIMD trigonometry functions

Types:

• float32x4 equivalent ---- simd_fq ("float quad")
• int32x4 equivalent ------ simd_iq ("int quad")
• uint32x4 equivalent ----- simd_uq ("unsigned int quad")

Functions:

• sin ---- simd_fq_sin
• cos ---- simd_fq_cos
• tan ---- simd_fq_tan
• cot ---- simd_fq_cot
• atan --- simd_fq_atan
• atan2 -- simd_fq_atan2
• exp ---- simd_fq_exp
• log ---- simd_fq_log

Uses SSE2 semantics. No special optimizations made for particular SIMD instruction sets. This is intended to be "good enough" for common use, like say, in a video game ;)

Implement "simd_trig_skeleton.h" using some set of SIMD instructions, like SSE2 or NEON, or even a fallback. Import your implementation into this file.

With a little effort, could probably be made to work with register widths other than 128bits (probably just needs some changes to the various constant array sizes)

SSE1 and MMX special casing has been removed entirely. It's 2023 here, and that's old news, sorry.

Based on "MathFun" and "MathFunExt", see the respective commentary below. I feel bad even putting my name on this, as the real work was done by the previous authors, but am doing so just to avoid licensing problems.

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License: zlib

See simd_trig.h for more details