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Attempt a small optimization in operator*(fquatSIMD, fvec4SIMD). No big improvement.

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This commit is contained in:
Dave Reid 2013-04-24 15:00:03 +10:00
parent c08ea7656b
commit e0cfd7d672
1 changed files with 15 additions and 4 deletions
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19
glm/gtx/simd_quat.inl
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@ -172,11 +172,22 @@ GLM_FUNC_QUALIFIER fquatSIMD operator* (fquatSIMD const & q1, fquatSIMD const &
GLM_FUNC_QUALIFIER fvec4SIMD operator* (fquatSIMD const & q, fvec4SIMD const & v)
{
__m128 uv = detail::sse_xpd_ps(q.Data, v.Data);
__m128 uuv = detail::sse_xpd_ps(q.Data, uv);
static const __m128 two = _mm_set1_ps(2.0f);
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)));
uuv = _mm_mul_ps(uuv, _mm_set1_ps(2.0f));
__m128 q_wwww = _mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 3, 3, 3));
__m128 q_swp0 = _mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 0, 2, 1));
__m128 q_swp1 = _mm_shuffle_ps(q.Data, q.Data, _MM_SHUFFLE(3, 1, 0, 2));
__m128 v_swp0 = _mm_shuffle_ps(v.Data, v.Data, _MM_SHUFFLE(3, 0, 2, 1));
__m128 v_swp1 = _mm_shuffle_ps(v.Data, v.Data, _MM_SHUFFLE(3, 1, 0, 2));
__m128 uv = _mm_sub_ps(_mm_mul_ps(q_swp0, v_swp1), _mm_mul_ps(q_swp1, v_swp0));
__m128 uv_swp0 = _mm_shuffle_ps(uv, uv, _MM_SHUFFLE(3, 0, 2, 1));
__m128 uv_swp1 = _mm_shuffle_ps(uv, uv, _MM_SHUFFLE(3, 1, 0, 2));
__m128 uuv = _mm_sub_ps(_mm_mul_ps(q_swp0, uv_swp1), _mm_mul_ps(q_swp1, uv_swp0));
uv = _mm_mul_ps(uv, _mm_mul_ps(q_wwww, two));
uuv = _mm_mul_ps(uuv, two);
return _mm_add_ps(v.Data, _mm_add_ps(uv, uuv));
}