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< title > intrinsic_exponential.hpp Source File< / title >
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< div class = "title" > intrinsic_exponential.hpp< / div > < / div >
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< a href = "a00044.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < pre class = "fragment" > < a name = "l00001" > < / a > 00001
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< a name = "l00029" > < / a > 00029 < span class = "preprocessor" > #ifndef glm_detail_intrinsic_exponential< / span >
< a name = "l00030" > < / a > 00030 < span class = "preprocessor" > < / span > < span class = "preprocessor" > #define glm_detail_intrinsic_exponential< / span >
< a name = "l00031" > < / a > 00031 < span class = "preprocessor" > < / span >
< a name = "l00032" > < / a > 00032 < span class = "preprocessor" > #include " < a class = "code" href = "a00082.html" title = "OpenGL Mathematics (glm.g-truc.net)" > setup.hpp< / a > " < / span >
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< a name = "l00033" > < / a > 00033
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< a name = "l00034" > < / a > 00034 < span class = "preprocessor" > #if((GLM_ARCH & GLM_ARCH_SSE2) != GLM_ARCH_SSE2)< / span >
< a name = "l00035" > < / a > 00035 < span class = "preprocessor" > < / span > < span class = "preprocessor" > # error " SSE2 instructions not supported or enabled" < / span >
< a name = "l00036" > < / a > 00036 < span class = "preprocessor" > < / span > < span class = "preprocessor" > #else< / span >
< a name = "l00037" > < / a > 00037 < span class = "preprocessor" > < / span >
< a name = "l00038" > < / a > 00038 < span class = "keyword" > namespace < / span > glm{
< a name = "l00039" > < / a > 00039 < span class = "keyword" > namespace < / span > detail
< a name = "l00040" > < / a > 00040 {
< a name = "l00041" > < / a > 00041 < span class = "comment" > /*< / span >
< a name = "l00042" > < / a > 00042 < span class = "comment" > GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x)< / span >
< a name = "l00043" > < / a > 00043 < span class = "comment" > {< / span >
< a name = "l00044" > < / a > 00044 < span class = "comment" > __m128 recip = _mm_rsqrt_ss( x ); // " estimate" opcode< / span >
< a name = "l00045" > < / a > 00045 < span class = "comment" > const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load< / span >
< a name = "l00046" > < / a > 00046 < span class = "comment" > const static __m128 half = { 0.5,0.5,0.5,0.5 };< / span >
< a name = "l00047" > < / a > 00047 < span class = "comment" > __m128 halfrecip = _mm_mul_ss( half, recip );< / span >
< a name = "l00048" > < / a > 00048 < span class = "comment" > __m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) );< / span >
< a name = "l00049" > < / a > 00049 < span class = "comment" > return _mm_mul_ss( halfrecip, threeminus_xrr );< / span >
< a name = "l00050" > < / a > 00050 < span class = "comment" > }< / span >
< a name = "l00051" > < / a > 00051 < span class = "comment" > < / span >
< a name = "l00052" > < / a > 00052 < span class = "comment" > GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps( float * RESTRICT vOut, float * RESTRICT vIn )< / span >
< a name = "l00053" > < / a > 00053 < span class = "comment" > {< / span >
< a name = "l00054" > < / a > 00054 < span class = "comment" > __m128 x = _mm_load_ss(& vIn[0]);< / span >
< a name = "l00055" > < / a > 00055 < span class = "comment" > __m128 y = _mm_load_ss(& vIn[1]);< / span >
< a name = "l00056" > < / a > 00056 < span class = "comment" > __m128 z = _mm_load_ss(& vIn[2]);< / span >
< a name = "l00057" > < / a > 00057 < span class = "comment" > < / span >
< a name = "l00058" > < / a > 00058 < span class = "comment" > const __m128 l = // compute x*x + y*y + z*z< / span >
< a name = "l00059" > < / a > 00059 < span class = "comment" > _mm_add_ss(< / span >
< a name = "l00060" > < / a > 00060 < span class = "comment" > _mm_add_ss( _mm_mul_ss(x,x),< / span >
< a name = "l00061" > < / a > 00061 < span class = "comment" > _mm_mul_ss(y,y)< / span >
< a name = "l00062" > < / a > 00062 < span class = "comment" > ),< / span >
< a name = "l00063" > < / a > 00063 < span class = "comment" > _mm_mul_ss( z, z )< / span >
< a name = "l00064" > < / a > 00064 < span class = "comment" > );< / span >
< a name = "l00065" > < / a > 00065 < span class = "comment" > < / span >
< a name = "l00066" > < / a > 00066 < span class = "comment" > < / span >
< a name = "l00067" > < / a > 00067 < span class = "comment" > const __m128 rsqt = _mm_rsqrt_nr_ss( l );< / span >
< a name = "l00068" > < / a > 00068 < span class = "comment" > _mm_store_ss( & vOut[0] , _mm_mul_ss( rsqt, x ) );< / span >
< a name = "l00069" > < / a > 00069 < span class = "comment" > _mm_store_ss( & vOut[1] , _mm_mul_ss( rsqt, y ) );< / span >
< a name = "l00070" > < / a > 00070 < span class = "comment" > _mm_store_ss( & vOut[2] , _mm_mul_ss( rsqt, z ) );< / span >
< a name = "l00071" > < / a > 00071 < span class = "comment" > < / span >
< a name = "l00072" > < / a > 00072 < span class = "comment" > return _mm_mul_ss( l , rsqt );< / span >
< a name = "l00073" > < / a > 00073 < span class = "comment" > }< / span >
< a name = "l00074" > < / a > 00074 < span class = "comment" > */< / span >
< a name = "l00075" > < / a > 00075 }< span class = "comment" > //namespace detail< / span >
< a name = "l00076" > < / a > 00076 }< span class = "comment" > //namespace glm< / span >
< a name = "l00077" > < / a > 00077
< a name = "l00078" > < / a > 00078 < span class = "preprocessor" > #endif//GLM_ARCH< / span >
< a name = "l00079" > < / a > 00079 < span class = "preprocessor" > < / span > < span class = "preprocessor" > #endif//glm_detail_intrinsic_exponential< / span >
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