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  51. <div class="title">intrinsic_exponential.hpp</div>  </div>
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  53. <div class="contents">
    54. 

  54. <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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  81. <a name="l00028"></a>00028 
    82. 

  82. <a name="l00029"></a>00029 <span class="preprocessor">#ifndef glm_detail_intrinsic_exponential</span>
    83. 

  83. <a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#define glm_detail_intrinsic_exponential</span>
    84. 

  84. <a name="l00031"></a>00031 <span class="preprocessor"></span>
    85. 

  85. <a name="l00032"></a>00032 <span class="preprocessor">#include &quot;<a class="code" href="a00083.html" title="OpenGL Mathematics (glm.g-truc.net)">setup.hpp</a>&quot;</span>
    86. 

  86. <a name="l00033"></a>00033 
    87. 

  87. <a name="l00034"></a>00034 <span class="preprocessor">#if((GLM_ARCH &amp; GLM_ARCH_SSE2) != GLM_ARCH_SSE2)</span>
    88. 

  88. <a name="l00035"></a>00035 <span class="preprocessor"></span><span class="preprocessor">#       error &quot;SSE2 instructions not supported or enabled&quot;</span>
    89. 

  89. <a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    90. 

  90. <a name="l00037"></a>00037 <span class="preprocessor"></span>
    91. 

  91. <a name="l00038"></a>00038 <span class="keyword">namespace </span>glm{
    92. 

  92. <a name="l00039"></a>00039 <span class="keyword">namespace </span>detail
    93. 

  93. <a name="l00040"></a>00040 {
    94. 

  94. <a name="l00041"></a>00041 <span class="comment">/*</span>
    95. 

  95. <a name="l00042"></a>00042 <span class="comment">GLM_FUNC_QUALIFIER __m128 sse_rsqrt_nr_ss(__m128 const x)</span>
    96. 

  96. <a name="l00043"></a>00043 <span class="comment">{</span>
    97. 

  97. <a name="l00044"></a>00044 <span class="comment">        __m128 recip = _mm_rsqrt_ss( x );  // &quot;estimate&quot; opcode</span>
    98. 

  98. <a name="l00045"></a>00045 <span class="comment">        const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load</span>
    99. 

  99. <a name="l00046"></a>00046 <span class="comment">        const static __m128 half = { 0.5,0.5,0.5,0.5 };</span>
    100. 

  100. <a name="l00047"></a>00047 <span class="comment">        __m128 halfrecip = _mm_mul_ss( half, recip );</span>
    101. 

  101. <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>
    102. 

  102. <a name="l00049"></a>00049 <span class="comment">        return _mm_mul_ss( halfrecip, threeminus_xrr );</span>
    103. 

  103. <a name="l00050"></a>00050 <span class="comment">}</span>
    104. 

  104. <a name="l00051"></a>00051 <span class="comment"> </span>
    105. 

  105. <a name="l00052"></a>00052 <span class="comment">GLM_FUNC_QUALIFIER __m128 sse_normalize_fast_ps(  float * RESTRICT vOut, float * RESTRICT vIn )</span>
    106. 

  106. <a name="l00053"></a>00053 <span class="comment">{</span>
    107. 

  107. <a name="l00054"></a>00054 <span class="comment">        __m128 x = _mm_load_ss(&amp;vIn[0]);</span>
    108. 

  108. <a name="l00055"></a>00055 <span class="comment">        __m128 y = _mm_load_ss(&amp;vIn[1]);</span>
    109. 

  109. <a name="l00056"></a>00056 <span class="comment">        __m128 z = _mm_load_ss(&amp;vIn[2]);</span>
    110. 

  110. <a name="l00057"></a>00057 <span class="comment"> </span>
    111. 

  111. <a name="l00058"></a>00058 <span class="comment">        const __m128 l =  // compute x*x + y*y + z*z</span>
    112. 

  112. <a name="l00059"></a>00059 <span class="comment">                _mm_add_ss(</span>
    113. 

  113. <a name="l00060"></a>00060 <span class="comment">                 _mm_add_ss( _mm_mul_ss(x,x),</span>
    114. 

  114. <a name="l00061"></a>00061 <span class="comment">                             _mm_mul_ss(y,y)</span>
    115. 

  115. <a name="l00062"></a>00062 <span class="comment">                            ),</span>
    116. 

  116. <a name="l00063"></a>00063 <span class="comment">                 _mm_mul_ss( z, z )</span>
    117. 

  117. <a name="l00064"></a>00064 <span class="comment">                );</span>
    118. 

  118. <a name="l00065"></a>00065 <span class="comment"> </span>
    119. 

  119. <a name="l00066"></a>00066 <span class="comment"> </span>
    120. 

  120. <a name="l00067"></a>00067 <span class="comment">        const __m128 rsqt = _mm_rsqrt_nr_ss( l );</span>
    121. 

  121. <a name="l00068"></a>00068 <span class="comment">        _mm_store_ss( &amp;vOut[0] , _mm_mul_ss( rsqt, x ) );</span>
    122. 

  122. <a name="l00069"></a>00069 <span class="comment">        _mm_store_ss( &amp;vOut[1] , _mm_mul_ss( rsqt, y ) );</span>
    123. 

  123. <a name="l00070"></a>00070 <span class="comment">        _mm_store_ss( &amp;vOut[2] , _mm_mul_ss( rsqt, z ) );</span>
    124. 

  124. <a name="l00071"></a>00071 <span class="comment"> </span>
    125. 

  125. <a name="l00072"></a>00072 <span class="comment">        return _mm_mul_ss( l , rsqt );</span>
    126. 

  126. <a name="l00073"></a>00073 <span class="comment">}</span>
    127. 

  127. <a name="l00074"></a>00074 <span class="comment">*/</span>
    128. 

  128. <a name="l00075"></a>00075 }<span class="comment">//namespace detail</span>
    129. 

  129. <a name="l00076"></a>00076 }<span class="comment">//namespace glm</span>
    130. 

  130. <a name="l00077"></a>00077 
    131. 

  131. <a name="l00078"></a>00078 <span class="preprocessor">#endif//GLM_ARCH</span>
    132. 

  132. <a name="l00079"></a>00079 <span class="preprocessor"></span><span class="preprocessor">#endif//glm_detail_intrinsic_exponential</span>
    133. 

  133. </pre></div></div>
    134. 

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