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<div class="title">intrinsic_exponential.hpp</div> </div>
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<div class="contents">
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<a href="a00045.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
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<a name="l00028"></a>00028
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<a name="l00029"></a>00029 <span class="preprocessor">#ifndef glm_detail_intrinsic_exponential</span>
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<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#define glm_detail_intrinsic_exponential</span>
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<a name="l00031"></a>00031 <span class="preprocessor"></span>
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<a name="l00032"></a>00032 <span class="preprocessor">#include "<a class="code" href="a00083.html" title="OpenGL Mathematics (glm.g-truc.net)">setup.hpp</a>"</span>
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<a name="l00033"></a>00033
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<a name="l00034"></a>00034 <span class="preprocessor">#if((GLM_ARCH & GLM_ARCH_SSE2) != GLM_ARCH_SSE2)</span>
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<a name="l00035"></a>00035 <span class="preprocessor"></span><span class="preprocessor"># error "SSE2 instructions not supported or enabled"</span>
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<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#else</span>
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<a name="l00037"></a>00037 <span class="preprocessor"></span>
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<a name="l00038"></a>00038 <span class="keyword">namespace </span>glm{
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<a name="l00039"></a>00039 <span class="keyword">namespace </span>detail
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<a name="l00040"></a>00040 {
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<a name="l00041"></a>00041 <span class="comment">/*</span>
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<a name="l00042"></a>00042 <span class="comment">GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x)</span>
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<a name="l00043"></a>00043 <span class="comment">{</span>
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<a name="l00044"></a>00044 <span class="comment"> __m128 recip = _mm_rsqrt_ss( x ); // "estimate" opcode</span>
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<a name="l00045"></a>00045 <span class="comment"> const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load</span>
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<a name="l00046"></a>00046 <span class="comment"> const static __m128 half = { 0.5,0.5,0.5,0.5 };</span>
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<a name="l00047"></a>00047 <span class="comment"> __m128 halfrecip = _mm_mul_ss( half, recip );</span>
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<a name="l00048"></a>00048 <span class="comment"> __m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) );</span>
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<a name="l00049"></a>00049 <span class="comment"> return _mm_mul_ss( halfrecip, threeminus_xrr );</span>
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<a name="l00050"></a>00050 <span class="comment">}</span>
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<a name="l00051"></a>00051 <span class="comment"> </span>
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<a name="l00052"></a>00052 <span class="comment">GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps( float * RESTRICT vOut, float * RESTRICT vIn )</span>
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<a name="l00053"></a>00053 <span class="comment">{</span>
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<a name="l00054"></a>00054 <span class="comment"> __m128 x = _mm_load_ss(&vIn[0]);</span>
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<a name="l00055"></a>00055 <span class="comment"> __m128 y = _mm_load_ss(&vIn[1]);</span>
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<a name="l00056"></a>00056 <span class="comment"> __m128 z = _mm_load_ss(&vIn[2]);</span>
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<a name="l00057"></a>00057 <span class="comment"> </span>
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<a name="l00058"></a>00058 <span class="comment"> const __m128 l = // compute x*x + y*y + z*z</span>
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<a name="l00059"></a>00059 <span class="comment"> _mm_add_ss(</span>
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<a name="l00060"></a>00060 <span class="comment"> _mm_add_ss( _mm_mul_ss(x,x),</span>
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<a name="l00061"></a>00061 <span class="comment"> _mm_mul_ss(y,y)</span>
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<a name="l00062"></a>00062 <span class="comment"> ),</span>
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<a name="l00063"></a>00063 <span class="comment"> _mm_mul_ss( z, z )</span>
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<a name="l00064"></a>00064 <span class="comment"> );</span>
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<a name="l00065"></a>00065 <span class="comment"> </span>
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<a name="l00066"></a>00066 <span class="comment"> </span>
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<a name="l00067"></a>00067 <span class="comment"> const __m128 rsqt = _mm_rsqrt_nr_ss( l );</span>
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<a name="l00068"></a>00068 <span class="comment"> _mm_store_ss( &vOut[0] , _mm_mul_ss( rsqt, x ) );</span>
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<a name="l00069"></a>00069 <span class="comment"> _mm_store_ss( &vOut[1] , _mm_mul_ss( rsqt, y ) );</span>
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<a name="l00070"></a>00070 <span class="comment"> _mm_store_ss( &vOut[2] , _mm_mul_ss( rsqt, z ) );</span>
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<a name="l00071"></a>00071 <span class="comment"> </span>
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<a name="l00072"></a>00072 <span class="comment"> return _mm_mul_ss( l , rsqt );</span>
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<a name="l00073"></a>00073 <span class="comment">}</span>
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<a name="l00074"></a>00074 <span class="comment">*/</span>
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<a name="l00075"></a>00075 }<span class="comment">//namespace detail</span>
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<a name="l00076"></a>00076 }<span class="comment">//namespace glm</span>
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<a name="l00077"></a>00077
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<a name="l00078"></a>00078 <span class="preprocessor">#endif//GLM_ARCH</span>
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<a name="l00079"></a>00079 <span class="preprocessor"></span><span class="preprocessor">#endif//glm_detail_intrinsic_exponential</span>
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</pre></div></div>
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