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intrinsic_exponential.hpp
1
29 #ifndef glm_detail_intrinsic_exponential
30 #define glm_detail_intrinsic_exponential
31
32 #include "setup.hpp"
33
34 #if(!(GLM_ARCH & GLM_ARCH_SSE2))
35 # error "SSE2 instructions not supported or enabled"
36 #else
37
38 namespace glm{
39 namespace detail
40 {
41 /*
42 GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x)
43 {
44 __m128 recip = _mm_rsqrt_ss( x ); // "estimate" opcode
45 const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load
46 const static __m128 half = { 0.5,0.5,0.5,0.5 };
47 __m128 halfrecip = _mm_mul_ss( half, recip );
48 __m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) );
49 return _mm_mul_ss( halfrecip, threeminus_xrr );
50 }
51
52 GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps( float * RESTRICT vOut, float * RESTRICT vIn )
53 {
54 __m128 x = _mm_load_ss(&vIn[0]);
55 __m128 y = _mm_load_ss(&vIn[1]);
56 __m128 z = _mm_load_ss(&vIn[2]);
57
58 const __m128 l = // compute x*x + y*y + z*z
59 _mm_add_ss(
60 _mm_add_ss( _mm_mul_ss(x,x),
61 _mm_mul_ss(y,y)
62 ),
63 _mm_mul_ss( z, z )
64 );
65
66
67 const __m128 rsqt = _mm_rsqrt_nr_ss( l );
68 _mm_store_ss( &vOut[0] , _mm_mul_ss( rsqt, x ) );
69 _mm_store_ss( &vOut[1] , _mm_mul_ss( rsqt, y ) );
70 _mm_store_ss( &vOut[2] , _mm_mul_ss( rsqt, z ) );
71
72 return _mm_mul_ss( l , rsqt );
73 }
74 */
75 }//namespace detail
76 }//namespace glm
77
78 #endif//GLM_ARCH
79 #endif//glm_detail_intrinsic_exponential