Home | History | Annotate | Download | only in detail 
      1 ///////////////////////////////////////////////////////////////////////////////////
      2 /// OpenGL Mathematics (glm.g-truc.net)
      3 ///
      4 /// Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net)
      5 /// Permission is hereby granted, free of charge, to any person obtaining a copy
      6 /// of this software and associated documentation files (the "Software"), to deal
      7 /// in the Software without restriction, including without limitation the rights
      8 /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      9 /// copies of the Software, and to permit persons to whom the Software is
     10 /// furnished to do so, subject to the following conditions:
     11 ///
     12 /// The above copyright notice and this permission notice shall be included in
     13 /// all copies or substantial portions of the Software.
     14 ///
     15 /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16 /// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17 /// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     18 /// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19 /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     20 /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     21 /// THE SOFTWARE.
     22 ///
     23 /// @ref core
     24 /// @file glm/core/intrinsic_exponential.hpp
     25 /// @date 2009-05-11 / 2011-06-15
     26 /// @author Christophe Riccio
     27 ///////////////////////////////////////////////////////////////////////////////////
     28 
     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
     80