61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2009-05-11
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// Updated : 2009-05-11
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// Licence : This source is under MIT License
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// File : glm/core/intrinsic_exponential.hpp
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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) != 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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inline __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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inline __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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