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79 lines
2.9 KiB
79 lines
2.9 KiB
/////////////////////////////////////////////////////////////////////////////////// |
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/// OpenGL Mathematics (glm.g-truc.net) |
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/// |
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/// Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net) |
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/// Permission is hereby granted, free of charge, to any person obtaining a copy |
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/// of this software and associated documentation files (the "Software"), to deal |
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/// in the Software without restriction, including without limitation the rights |
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/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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/// copies of the Software, and to permit persons to whom the Software is |
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/// furnished to do so, subject to the following conditions: |
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/// |
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/// The above copyright notice and this permission notice shall be included in |
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/// all copies or substantial portions of the Software. |
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/// |
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/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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/// THE SOFTWARE. |
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/// |
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/// @ref core |
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/// @file glm/core/intrinsic_exponential.hpp |
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/// @date 2009-05-11 / 2011-06-15 |
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/// @author Christophe Riccio |
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/////////////////////////////////////////////////////////////////////////////////// |
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#ifndef glm_detail_intrinsic_exponential |
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#define glm_detail_intrinsic_exponential |
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#include "setup.hpp" |
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#if(!(GLM_ARCH & GLM_ARCH_SSE2)) |
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# error "SSE2 instructions not supported or enabled" |
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#else |
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namespace glm{ |
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namespace detail |
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{ |
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/* |
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GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x) |
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{ |
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__m128 recip = _mm_rsqrt_ss( x ); // "estimate" opcode |
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const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load |
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const static __m128 half = { 0.5,0.5,0.5,0.5 }; |
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__m128 halfrecip = _mm_mul_ss( half, recip ); |
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__m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) ); |
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return _mm_mul_ss( halfrecip, threeminus_xrr ); |
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} |
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GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps( float * RESTRICT vOut, float * RESTRICT vIn ) |
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{ |
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__m128 x = _mm_load_ss(&vIn[0]); |
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__m128 y = _mm_load_ss(&vIn[1]); |
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__m128 z = _mm_load_ss(&vIn[2]); |
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const __m128 l = // compute x*x + y*y + z*z |
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_mm_add_ss( |
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_mm_add_ss( _mm_mul_ss(x,x), |
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_mm_mul_ss(y,y) |
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), |
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_mm_mul_ss( z, z ) |
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); |
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const __m128 rsqt = _mm_rsqrt_nr_ss( l ); |
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_mm_store_ss( &vOut[0] , _mm_mul_ss( rsqt, x ) ); |
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_mm_store_ss( &vOut[1] , _mm_mul_ss( rsqt, y ) ); |
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_mm_store_ss( &vOut[2] , _mm_mul_ss( rsqt, z ) ); |
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return _mm_mul_ss( l , rsqt ); |
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} |
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*/ |
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}//namespace detail |
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}//namespace glm |
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#endif//GLM_ARCH |
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#endif//glm_detail_intrinsic_exponential
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