intrinsic_exponential.hpp

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00029 #ifndef glm_detail_intrinsic_exponential
00030 #define glm_detail_intrinsic_exponential
00031 
00032 #include "setup.hpp"
00033 
00034 #if((GLM_ARCH & GLM_ARCH_SSE2) != GLM_ARCH_SSE2)
00035 #       error "SSE2 instructions not supported or enabled"
00036 #else
00037 
00038 namespace glm{
00039 namespace detail
00040 {
00041 /*
00042 GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x)
00043 {
00044         __m128 recip = _mm_rsqrt_ss( x );  // "estimate" opcode
00045         const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load
00046         const static __m128 half = { 0.5,0.5,0.5,0.5 };
00047         __m128 halfrecip = _mm_mul_ss( half, recip );
00048         __m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) );
00049         return _mm_mul_ss( halfrecip, threeminus_xrr );
00050 }
00051  
00052 GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps(  float * RESTRICT vOut, float * RESTRICT vIn )
00053 {
00054         __m128 x = _mm_load_ss(&vIn[0]);
00055         __m128 y = _mm_load_ss(&vIn[1]);
00056         __m128 z = _mm_load_ss(&vIn[2]);
00057  
00058         const __m128 l =  // compute x*x + y*y + z*z
00059                 _mm_add_ss(
00060                  _mm_add_ss( _mm_mul_ss(x,x),
00061                              _mm_mul_ss(y,y)
00062                             ),
00063                  _mm_mul_ss( z, z )
00064                 );
00065  
00066  
00067         const __m128 rsqt = _mm_rsqrt_nr_ss( l );
00068         _mm_store_ss( &vOut[0] , _mm_mul_ss( rsqt, x ) );
00069         _mm_store_ss( &vOut[1] , _mm_mul_ss( rsqt, y ) );
00070         _mm_store_ss( &vOut[2] , _mm_mul_ss( rsqt, z ) );
00071  
00072         return _mm_mul_ss( l , rsqt );
00073 }
00074 */
00075 }//namespace detail
00076 }//namespace glm
00077 
00078 #endif//GLM_ARCH
00079 #endif//glm_detail_intrinsic_exponential