78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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/// OpenGL Mathematics (glm.g-truc.net)
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///
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/// Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net)
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/// Permission is hereby granted, free of charge, to any person obtaining a copy
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/// of this software and associated documentation files (the "Software"), to deal
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/// in the Software without restriction, including without limitation the rights
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/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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/// copies of the Software, and to permit persons to whom the Software is
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/// furnished to do so, subject to the following conditions:
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///
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/// The above copyright notice and this permission notice shall be included in
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/// all copies or substantial portions of the Software.
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///
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/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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/// THE SOFTWARE.
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///
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/// @ref core
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/// @file glm/core/intrinsic_exponential.hpp
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/// @date 2009-05-11 / 2011-06-15
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/// @author Christophe Riccio
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///////////////////////////////////////////////////////////////////////////////////
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#pragma once
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#include "setup.hpp"
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#if(!(GLM_ARCH & 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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GLM_FUNC_QUALIFIER __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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GLM_FUNC_QUALIFIER __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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