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49 <div class="headertitle">
50 <h1>arm_cmplx_mag_squared_q31.c</h1> </div>
52 <div class="contents">
53 <a href="arm__cmplx__mag__squared__q31_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* ---------------------------------------------------------------------- </span>
54 <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span>
55 <a name="l00003"></a>00003 <span class="comment">* </span>
56 <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span>
57 <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span>
58 <a name="l00006"></a>00006 <span class="comment">* </span>
59 <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span>
60 <a name="l00008"></a>00008 <span class="comment">* Title: arm_cmplx_mag_squared_q31.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Q31 complex magnitude squared. </span>
63 <a name="l00011"></a>00011 <span class="comment">* </span>
64 <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
65 <a name="l00013"></a>00013 <span class="comment">* </span>
66 <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span>
67 <a name="l00015"></a>00015 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span>
68 <a name="l00016"></a>00016 <span class="comment">* </span>
69 <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29 </span>
70 <a name="l00018"></a>00018 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span>
71 <a name="l00019"></a>00019 <span class="comment">* </span>
72 <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11 </span>
73 <a name="l00021"></a>00021 <span class="comment">* Documentation updated. </span>
74 <a name="l00022"></a>00022 <span class="comment">* </span>
75 <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05 </span>
76 <a name="l00024"></a>00024 <span class="comment">* Production release and review comments incorporated. </span>
77 <a name="l00025"></a>00025 <span class="comment">* </span>
78 <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20 </span>
79 <a name="l00027"></a>00027 <span class="comment">* Production release and review comments incorporated. </span>
80 <a name="l00028"></a>00028 <span class="comment">* ---------------------------------------------------------------------------- */</span>
81 <a name="l00029"></a>00029
82 <a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
83 <a name="l00031"></a>00031
84 <a name="l00055"></a><a class="code" href="group__cmplx__mag__squared.html#ga384b0538101e8c03fa4fa14271e63b04">00055</a> <span class="keywordtype">void</span> <a class="code" href="group__cmplx__mag__squared.html#ga384b0538101e8c03fa4fa14271e63b04" title="Q31 complex magnitude squared.">arm_cmplx_mag_squared_q31</a>(
85 <a name="l00056"></a>00056 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc,
86 <a name="l00057"></a>00057 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst,
87 <a name="l00058"></a>00058 uint32_t numSamples)
88 <a name="l00059"></a>00059 {
89 <a name="l00060"></a>00060 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> real, imag; <span class="comment">/* Temporary variables to store real and imaginary values */</span>
90 <a name="l00061"></a>00061 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> acc0, acc1; <span class="comment">/* Accumulators */</span>
91 <a name="l00062"></a>00062
92 <a name="l00063"></a>00063 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
93 <a name="l00064"></a>00064 <span class="preprocessor"></span>
94 <a name="l00065"></a>00065 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
95 <a name="l00066"></a>00066 uint32_t blkCnt; <span class="comment">/* loop counter */</span>
96 <a name="l00067"></a>00067
97 <a name="l00068"></a>00068 <span class="comment">/* loop Unrolling */</span>
98 <a name="l00069"></a>00069 blkCnt = numSamples >> 2u;
99 <a name="l00070"></a>00070
100 <a name="l00071"></a>00071 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
101 <a name="l00072"></a>00072 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
102 <a name="l00073"></a>00073 <span class="keywordflow">while</span>(blkCnt > 0u)
103 <a name="l00074"></a>00074 {
104 <a name="l00075"></a>00075 <span class="comment">/* C[0] = (A[0] * A[0] + A[1] * A[1]) */</span>
105 <a name="l00076"></a>00076 real = *pSrc++;
106 <a name="l00077"></a>00077 imag = *pSrc++;
107 <a name="l00078"></a>00078 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) real * real) >> 33);
108 <a name="l00079"></a>00079 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) imag * imag) >> 33);
109 <a name="l00080"></a>00080 <span class="comment">/* store the result in 3.29 format in the destination buffer. */</span>
110 <a name="l00081"></a>00081 *pDst++ = acc0 + acc1;
111 <a name="l00082"></a>00082
112 <a name="l00083"></a>00083 real = *pSrc++;
113 <a name="l00084"></a>00084 imag = *pSrc++;
114 <a name="l00085"></a>00085 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) real * real) >> 33);
115 <a name="l00086"></a>00086 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) imag * imag) >> 33);
116 <a name="l00087"></a>00087 <span class="comment">/* store the result in 3.29 format in the destination buffer. */</span>
117 <a name="l00088"></a>00088 *pDst++ = acc0 + acc1;
118 <a name="l00089"></a>00089
119 <a name="l00090"></a>00090 real = *pSrc++;
120 <a name="l00091"></a>00091 imag = *pSrc++;
121 <a name="l00092"></a>00092 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) real * real) >> 33);
122 <a name="l00093"></a>00093 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) imag * imag) >> 33);
123 <a name="l00094"></a>00094 <span class="comment">/* store the result in 3.29 format in the destination buffer. */</span>
124 <a name="l00095"></a>00095 *pDst++ = acc0 + acc1;
125 <a name="l00096"></a>00096
126 <a name="l00097"></a>00097 real = *pSrc++;
127 <a name="l00098"></a>00098 imag = *pSrc++;
128 <a name="l00099"></a>00099 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) real * real) >> 33);
129 <a name="l00100"></a>00100 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) imag * imag) >> 33);
130 <a name="l00101"></a>00101 <span class="comment">/* store the result in 3.29 format in the destination buffer. */</span>
131 <a name="l00102"></a>00102 *pDst++ = acc0 + acc1;
132 <a name="l00103"></a>00103
133 <a name="l00104"></a>00104 <span class="comment">/* Decrement the loop counter */</span>
134 <a name="l00105"></a>00105 blkCnt--;
135 <a name="l00106"></a>00106 }
136 <a name="l00107"></a>00107
137 <a name="l00108"></a>00108 <span class="comment">/* If the numSamples is not a multiple of 4, compute any remaining output samples here. </span>
138 <a name="l00109"></a>00109 <span class="comment"> ** No loop unrolling is used. */</span>
139 <a name="l00110"></a>00110 blkCnt = numSamples % 0x4u;
140 <a name="l00111"></a>00111
141 <a name="l00112"></a>00112 <span class="keywordflow">while</span>(blkCnt > 0u)
142 <a name="l00113"></a>00113 {
143 <a name="l00114"></a>00114 <span class="comment">/* C[0] = (A[0] * A[0] + A[1] * A[1]) */</span>
144 <a name="l00115"></a>00115 real = *pSrc++;
145 <a name="l00116"></a>00116 imag = *pSrc++;
146 <a name="l00117"></a>00117 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) real * real) >> 33);
147 <a name="l00118"></a>00118 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) imag * imag) >> 33);
148 <a name="l00119"></a>00119 <span class="comment">/* store the result in 3.29 format in the destination buffer. */</span>
149 <a name="l00120"></a>00120 *pDst++ = acc0 + acc1;
150 <a name="l00121"></a>00121
151 <a name="l00122"></a>00122 <span class="comment">/* Decrement the loop counter */</span>
152 <a name="l00123"></a>00123 blkCnt--;
153 <a name="l00124"></a>00124 }
154 <a name="l00125"></a>00125
155 <a name="l00126"></a>00126 <span class="preprocessor">#else</span>
156 <a name="l00127"></a>00127 <span class="preprocessor"></span>
157 <a name="l00128"></a>00128 <span class="comment">/* Run the below code for Cortex-M0 */</span>
158 <a name="l00129"></a>00129
159 <a name="l00130"></a>00130 <span class="keywordflow">while</span>(numSamples > 0u)
160 <a name="l00131"></a>00131 {
161 <a name="l00132"></a>00132 <span class="comment">/* out = ((real * real) + (imag * imag)) */</span>
162 <a name="l00133"></a>00133 real = *pSrc++;
163 <a name="l00134"></a>00134 imag = *pSrc++;
164 <a name="l00135"></a>00135 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) real * real) >> 33);
165 <a name="l00136"></a>00136 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) imag * imag) >> 33);
166 <a name="l00137"></a>00137 <span class="comment">/* store the result in 3.29 format in the destination buffer. */</span>
167 <a name="l00138"></a>00138 *pDst++ = acc0 + acc1;
168 <a name="l00139"></a>00139
169 <a name="l00140"></a>00140 <span class="comment">/* Decrement the loop counter */</span>
170 <a name="l00141"></a>00141 numSamples--;
171 <a name="l00142"></a>00142 }
172 <a name="l00143"></a>00143
173 <a name="l00144"></a>00144 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
174 <a name="l00145"></a>00145
175 <a name="l00146"></a>00146 }
176 <a name="l00147"></a>00147
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