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