| /////////////////////////////////////////////////////////////////////////////////// |
| /// OpenGL Mathematics (glm.g-truc.net) |
| /// |
| /// Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) |
| /// Permission is hereby granted, free of charge, to any person obtaining a copy |
| /// of this software and associated documentation files (the "Software"), to deal |
| /// in the Software without restriction, including without limitation the rights |
| /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| /// copies of the Software, and to permit persons to whom the Software is |
| /// furnished to do so, subject to the following conditions: |
| /// |
| /// The above copyright notice and this permission notice shall be included in |
| /// all copies or substantial portions of the Software. |
| /// |
| /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| /// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| /// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| /// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| /// THE SOFTWARE. |
| /// |
| /// @ref core |
| /// @file glm/core/intrinsic_exponential.hpp |
| /// @date 2009-05-11 / 2011-06-15 |
| /// @author Christophe Riccio |
| /////////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef glm_detail_intrinsic_exponential |
| #define glm_detail_intrinsic_exponential |
| |
| #include "setup.hpp" |
| |
| #if(!(GLM_ARCH & GLM_ARCH_SSE2)) |
| # error "SSE2 instructions not supported or enabled" |
| #else |
| |
| namespace glm{ |
| namespace detail |
| { |
| /* |
| GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x) |
| { |
| __m128 recip = _mm_rsqrt_ss( x ); // "estimate" opcode |
| const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load |
| const static __m128 half = { 0.5,0.5,0.5,0.5 }; |
| __m128 halfrecip = _mm_mul_ss( half, recip ); |
| __m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) ); |
| return _mm_mul_ss( halfrecip, threeminus_xrr ); |
| } |
| |
| GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps( float * RESTRICT vOut, float * RESTRICT vIn ) |
| { |
| __m128 x = _mm_load_ss(&vIn[0]); |
| __m128 y = _mm_load_ss(&vIn[1]); |
| __m128 z = _mm_load_ss(&vIn[2]); |
| |
| const __m128 l = // compute x*x + y*y + z*z |
| _mm_add_ss( |
| _mm_add_ss( _mm_mul_ss(x,x), |
| _mm_mul_ss(y,y) |
| ), |
| _mm_mul_ss( z, z ) |
| ); |
| |
| |
| const __m128 rsqt = _mm_rsqrt_nr_ss( l ); |
| _mm_store_ss( &vOut[0] , _mm_mul_ss( rsqt, x ) ); |
| _mm_store_ss( &vOut[1] , _mm_mul_ss( rsqt, y ) ); |
| _mm_store_ss( &vOut[2] , _mm_mul_ss( rsqt, z ) ); |
| |
| return _mm_mul_ss( l , rsqt ); |
| } |
| */ |
| }//namespace detail |
| }//namespace glm |
| |
| #endif//GLM_ARCH |
| #endif//glm_detail_intrinsic_exponential |