You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
60 lines
2.0 KiB
60 lines
2.0 KiB
/////////////////////////////////////////////////////////////////////////////////////////////////// |
|
// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net) |
|
/////////////////////////////////////////////////////////////////////////////////////////////////// |
|
// Created : 2009-05-11 |
|
// Updated : 2009-05-11 |
|
// Licence : This source is under MIT License |
|
// File : glm/core/intrinsic_exponential.hpp |
|
/////////////////////////////////////////////////////////////////////////////////////////////////// |
|
|
|
#ifndef glm_detail_intrinsic_exponential |
|
#define glm_detail_intrinsic_exponential |
|
|
|
#include "setup.hpp" |
|
|
|
#if((GLM_ARCH & GLM_ARCH_SSE2) != GLM_ARCH_SSE2) |
|
# error "SSE2 instructions not supported or enabled" |
|
#else |
|
|
|
namespace glm{ |
|
namespace detail |
|
{ |
|
/* |
|
inline __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 ); |
|
} |
|
|
|
inline __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
|
|
|