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49 <div class="headertitle">
50 <h1>arm_cmplx_mult_cmplx_f32.c</h1> </div>
52 <div class="contents">
53 <a href="arm__cmplx__mult__cmplx__f32_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_mult_cmplx_f32.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Floating-point complex-by-complex multiplication </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="l00073"></a><a class="code" href="group___cmplx_by_cmplx_mult.html#ga14b47080054a1ba1250a86805be1ff6b">00073</a> <span class="keywordtype">void</span> <a class="code" href="group___cmplx_by_cmplx_mult.html#ga14b47080054a1ba1250a86805be1ff6b" title="Floating-point complex-by-complex multiplication.">arm_cmplx_mult_cmplx_f32</a>(
85 <a name="l00074"></a>00074 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrcA,
86 <a name="l00075"></a>00075 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrcB,
87 <a name="l00076"></a>00076 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pDst,
88 <a name="l00077"></a>00077 uint32_t numSamples)
89 <a name="l00078"></a>00078 {
90 <a name="l00079"></a>00079 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> a, b, c, d; <span class="comment">/* Temporary variables to store real and imaginary values */</span>
91 <a name="l00080"></a>00080
92 <a name="l00081"></a>00081 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
93 <a name="l00082"></a>00082 <span class="preprocessor"></span>
94 <a name="l00083"></a>00083 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
95 <a name="l00084"></a>00084 uint32_t blkCnt; <span class="comment">/* loop counters */</span>
96 <a name="l00085"></a>00085
97 <a name="l00086"></a>00086 <span class="comment">/* loop Unrolling */</span>
98 <a name="l00087"></a>00087 blkCnt = numSamples >> 2u;
99 <a name="l00088"></a>00088
100 <a name="l00089"></a>00089 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
101 <a name="l00090"></a>00090 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
102 <a name="l00091"></a>00091 <span class="keywordflow">while</span>(blkCnt > 0u)
103 <a name="l00092"></a>00092 {
104 <a name="l00093"></a>00093 <span class="comment">/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */</span>
105 <a name="l00094"></a>00094 <span class="comment">/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */</span>
106 <a name="l00095"></a>00095 a = *pSrcA++;
107 <a name="l00096"></a>00096 b = *pSrcA++;
108 <a name="l00097"></a>00097 c = *pSrcB++;
109 <a name="l00098"></a>00098 d = *pSrcB++;
110 <a name="l00099"></a>00099
111 <a name="l00100"></a>00100 <span class="comment">/* store the result in the destination buffer. */</span>
112 <a name="l00101"></a>00101 *pDst++ = (a * c) - (b * d);
113 <a name="l00102"></a>00102 *pDst++ = (a * d) + (b * c);
114 <a name="l00103"></a>00103
115 <a name="l00104"></a>00104 a = *pSrcA++;
116 <a name="l00105"></a>00105 b = *pSrcA++;
117 <a name="l00106"></a>00106 c = *pSrcB++;
118 <a name="l00107"></a>00107 d = *pSrcB++;
119 <a name="l00108"></a>00108
120 <a name="l00109"></a>00109 *pDst++ = (a * c) - (b * d);
121 <a name="l00110"></a>00110 *pDst++ = (a * d) + (b * c);
122 <a name="l00111"></a>00111
123 <a name="l00112"></a>00112 a = *pSrcA++;
124 <a name="l00113"></a>00113 b = *pSrcA++;
125 <a name="l00114"></a>00114 c = *pSrcB++;
126 <a name="l00115"></a>00115 d = *pSrcB++;
127 <a name="l00116"></a>00116
128 <a name="l00117"></a>00117 *pDst++ = (a * c) - (b * d);
129 <a name="l00118"></a>00118 *pDst++ = (a * d) + (b * c);
130 <a name="l00119"></a>00119
131 <a name="l00120"></a>00120 a = *pSrcA++;
132 <a name="l00121"></a>00121 b = *pSrcA++;
133 <a name="l00122"></a>00122 c = *pSrcB++;
134 <a name="l00123"></a>00123 d = *pSrcB++;
135 <a name="l00124"></a>00124
136 <a name="l00125"></a>00125 *pDst++ = (a * c) - (b * d);
137 <a name="l00126"></a>00126 *pDst++ = (a * d) + (b * c);
138 <a name="l00127"></a>00127
139 <a name="l00128"></a>00128 <span class="comment">/* Decrement the numSamples loop counter */</span>
140 <a name="l00129"></a>00129 blkCnt--;
141 <a name="l00130"></a>00130 }
142 <a name="l00131"></a>00131
143 <a name="l00132"></a>00132 <span class="comment">/* If the numSamples is not a multiple of 4, compute any remaining output samples here. </span>
144 <a name="l00133"></a>00133 <span class="comment"> ** No loop unrolling is used. */</span>
145 <a name="l00134"></a>00134 blkCnt = numSamples % 0x4u;
146 <a name="l00135"></a>00135
147 <a name="l00136"></a>00136 <span class="keywordflow">while</span>(blkCnt > 0u)
148 <a name="l00137"></a>00137 {
149 <a name="l00138"></a>00138 <span class="comment">/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */</span>
150 <a name="l00139"></a>00139 <span class="comment">/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */</span>
151 <a name="l00140"></a>00140 a = *pSrcA++;
152 <a name="l00141"></a>00141 b = *pSrcA++;
153 <a name="l00142"></a>00142 c = *pSrcB++;
154 <a name="l00143"></a>00143 d = *pSrcB++;
155 <a name="l00144"></a>00144
156 <a name="l00145"></a>00145 <span class="comment">/* store the result in the destination buffer. */</span>
157 <a name="l00146"></a>00146 *pDst++ = (a * c) - (b * d);
158 <a name="l00147"></a>00147 *pDst++ = (a * d) + (b * c);
159 <a name="l00148"></a>00148
160 <a name="l00149"></a>00149 <span class="comment">/* Decrement the numSamples loop counter */</span>
161 <a name="l00150"></a>00150 blkCnt--;
162 <a name="l00151"></a>00151 }
163 <a name="l00152"></a>00152
164 <a name="l00153"></a>00153 <span class="preprocessor">#else</span>
165 <a name="l00154"></a>00154 <span class="preprocessor"></span>
166 <a name="l00155"></a>00155 <span class="comment">/* Run the below code for Cortex-M0 */</span>
167 <a name="l00156"></a>00156
168 <a name="l00157"></a>00157 <span class="keywordflow">while</span>(numSamples > 0u)
169 <a name="l00158"></a>00158 {
170 <a name="l00159"></a>00159 <span class="comment">/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */</span>
171 <a name="l00160"></a>00160 <span class="comment">/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */</span>
172 <a name="l00161"></a>00161 a = *pSrcA++;
173 <a name="l00162"></a>00162 b = *pSrcA++;
174 <a name="l00163"></a>00163 c = *pSrcB++;
175 <a name="l00164"></a>00164 d = *pSrcB++;
176 <a name="l00165"></a>00165
177 <a name="l00166"></a>00166 <span class="comment">/* store the result in the destination buffer. */</span>
178 <a name="l00167"></a>00167 *pDst++ = (a * c) - (b * d);
179 <a name="l00168"></a>00168 *pDst++ = (a * d) + (b * c);
180 <a name="l00169"></a>00169
181 <a name="l00170"></a>00170 <span class="comment">/* Decrement the numSamples loop counter */</span>
182 <a name="l00171"></a>00171 numSamples--;
183 <a name="l00172"></a>00172 }
184 <a name="l00173"></a>00173
185 <a name="l00174"></a>00174 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
186 <a name="l00175"></a>00175
187 <a name="l00176"></a>00176 }
188 <a name="l00177"></a>00177
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