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Attempt a small optimization in operator*(fquatSIMD, fvec4SIMD). No big improvement.
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@ -172,11 +172,22 @@ GLM_FUNC_QUALIFIER fquatSIMD operator* (fquatSIMD const & q1, fquatSIMD const &
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GLM_FUNC_QUALIFIER fvec4SIMD operator* (fquatSIMD const & q, fvec4SIMD const & v)
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{
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__m128 uv = detail::sse_xpd_ps(q.Data, v.Data);
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__m128 uuv = detail::sse_xpd_ps(q.Data, uv);
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static const __m128 two = _mm_set1_ps(2.0f);
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uv = _mm_mul_ps(uv, _mm_mul_ps(_mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 3, 3, 3)), _mm_set1_ps(2.0f)));
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uuv = _mm_mul_ps(uuv, _mm_set1_ps(2.0f));
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__m128 q_wwww = _mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 3, 3, 3));
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__m128 q_swp0 = _mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 0, 2, 1));
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__m128 q_swp1 = _mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 1, 0, 2));
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__m128 v_swp0 = _mm_shuffle_ps(v.Data, v.Data, _MM_SHUFFLE(3, 0, 2, 1));
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__m128 v_swp1 = _mm_shuffle_ps(v.Data, v.Data, _MM_SHUFFLE(3, 1, 0, 2));
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__m128 uv = _mm_sub_ps(_mm_mul_ps(q_swp0, v_swp1), _mm_mul_ps(q_swp1, v_swp0));
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__m128 uv_swp0 = _mm_shuffle_ps(uv, uv, _MM_SHUFFLE(3, 0, 2, 1));
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__m128 uv_swp1 = _mm_shuffle_ps(uv, uv, _MM_SHUFFLE(3, 1, 0, 2));
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__m128 uuv = _mm_sub_ps(_mm_mul_ps(q_swp0, uv_swp1), _mm_mul_ps(q_swp1, uv_swp0));
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uv = _mm_mul_ps(uv, _mm_mul_ps(q_wwww, two));
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uuv = _mm_mul_ps(uuv, two);
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return _mm_add_ps(v.Data, _mm_add_ps(uv, uuv));
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}
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