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slight optimization of SSE base integer mul (thanks to Rohit Garg)

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This commit is contained in:
Gael Guennebaud
2009-03-08 10:14:07 +00:00
parent f9790a649c
commit 7718a8ed83
2 changed files with 26 additions and 18 deletions
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17
Eigen/src/Geometry/arch/Geometry_SSE.h
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@@ -26,9 +26,6 @@
#ifndef EIGEN_GEOMETRY_SSE_H
#define EIGEN_GEOMETRY_SSE_H
#define vec4f_swizzle(v,p,q,r,s) (_mm_castsi128_ps(_mm_shuffle_epi32( _mm_castps_si128(v), \
((s)<<6|(r)<<4|(q)<<2|(p)))))
template<> inline Quaternion<float>
ei_quaternion_product<EiArch_SSE,float>(const Quaternion<float>& _a, const Quaternion<float>& _b)
{
@@ -36,14 +33,14 @@ ei_quaternion_product<EiArch_SSE,float>(const Quaternion<float>& _a, const Quate
Quaternion<float> res;
__m128 a = _a.coeffs().packet<Aligned>(0);
__m128 b = _b.coeffs().packet<Aligned>(0);
__m128 flip1 = _mm_xor_ps(_mm_mul_ps(vec4f_swizzle(a,1,2,0,2),
vec4f_swizzle(b,2,0,1,2)),mask);
__m128 flip2 = _mm_xor_ps(_mm_mul_ps(vec4f_swizzle(a,3,3,3,1),
vec4f_swizzle(b,0,1,2,1)),mask);
__m128 flip1 = _mm_xor_ps(_mm_mul_ps(ei_vec4f_swizzle1(a,1,2,0,2),
ei_vec4f_swizzle1(b,2,0,1,2)),mask);
__m128 flip2 = _mm_xor_ps(_mm_mul_ps(ei_vec4f_swizzle1(a,3,3,3,1),
ei_vec4f_swizzle1(b,0,1,2,1)),mask);
ei_pstore(&res.x(),
_mm_add_ps(_mm_sub_ps(_mm_mul_ps(a,vec4f_swizzle(b,3,3,3,3)),
_mm_mul_ps(vec4f_swizzle(a,2,0,1,0),
vec4f_swizzle(b,1,2,0,0))),
_mm_add_ps(_mm_sub_ps(_mm_mul_ps(a,ei_vec4f_swizzle1(b,3,3,3,3)),
_mm_mul_ps(ei_vec4f_swizzle1(a,2,0,1,0),
ei_vec4f_swizzle1(b,1,2,0,0))),
_mm_add_ps(flip1,flip2)));
return res;
}