SIMD: AlphaComposite SSE4 & AVX2 #8299
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SIMD AlphaComposite. avx2 implementation SIMD AlphaComposite. increase precision SIMD AlphaComposite. speedup sse4 by using _mm_mullo_epi16 instead of _mm_mullo_epi32 SIMD AlphaComposite. speedup avx2 by using _mm256_mullo_epi16 instead of _mm256_mullo_epi32 SIMD AlphaComposite. fix bugs SIMD AlphaComposite. move declarations to beginning of the blocks SIMD AlphaComposite. fast div aproximation
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Depends on #8209.
This is porting of AlphaComposite acceleration from Pillow-SIMD.
This PR includes required changes from #8209.