arm_q15_to_q31.c
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00001 /* ---------------------------------------------------------------------------- 00002 * Copyright (C) 2011 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. December 2011 00005 * $Revision: V2.0.0 00006 * 00007 * Project: Cortex-R DSP Library 00008 * Title: arm_q15_to_q31.c 00009 * 00010 * Description: Converts the elements of the Q15 vector to Q31 vector. 00011 * 00012 * Target Processor: Cortex-R4/R5 00013 * 00014 * Version 1.0.0 2011/03/08 00015 * Alpha release. 00016 * 00017 * Version 1.0.1 2011/09/30 00018 * Beta release. 00019 * 00020 * Version 2.0.0 2011/12/15 00021 * Final release. 00022 * 00023 * ---------------------------------------------------------------------------- */ 00024 #include "arm_math.h" 00025 00057 void arm_q15_to_q31( 00058 q15_t * pSrc, 00059 q31_t * pDst, 00060 uint32_t blockSize) 00061 { 00062 q15_t *pIn = pSrc; /* Src pointer */ 00063 uint32_t blkCnt; /* loop counter */ 00064 q31_t out1, out2, out3, out4; 00065 q31_t in1, in2, in3, in4; 00066 00067 /*loop Unrolling */ 00068 blkCnt = blockSize >> 3u; 00069 00070 /* First part of the processing with loop unrolling. Compute 8 outputs at a time. 00071 ** a second loop below computes the remaining 1 to 7 samples. */ 00072 while(blkCnt > 0u) 00073 { 00074 /* C = (q31_t)A << 16 */ 00075 /* convert from q15 to q31 and then store the results in the destination buffer */ 00076 /* read two samples at a time */ 00077 in1 = _SIMD32_OFFSET(pIn); 00078 in2 = _SIMD32_OFFSET(pIn + 2); 00079 in3 = _SIMD32_OFFSET(pIn + 4); 00080 in4 = _SIMD32_OFFSET(pIn + 6); 00081 00082 #ifndef ARM_MATH_BIG_ENDIAN 00083 00084 /* extract lower 16 bits to 32 bit result */ 00085 out1 = in1 << 16u; 00086 /* extract upper 16 bits to 32 bit result */ 00087 out2 = in1 & 0xFFFF0000; 00088 00089 #else 00090 00091 /* extract upper 16 bits to 32 bit result */ 00092 out1 = in1 & 0xFFFF0000; 00093 /* extract lower 16 bits to 32 bit result */ 00094 out2 = in1 << 16u; 00095 00096 #endif // #ifndef ARM_MATH_BIG_ENDIAN 00097 00098 /* store result to destination */ 00099 pDst[0] = out1; 00100 00101 #ifndef ARM_MATH_BIG_ENDIAN 00102 00103 /* extract lower 16 bits to 32 bit result */ 00104 out3 = in2 << 16u; 00105 00106 /* store result to destination */ 00107 pDst[1] = out2; 00108 00109 /* extract upper 16 bits to 32 bit result */ 00110 out4 = in2 & 0xFFFF0000; 00111 00112 #else 00113 00114 /* extract upper 16 bits to 32 bit result */ 00115 out3 = in2 & 0xFFFF0000; 00116 00117 /* store result to destination */ 00118 pDst[1] = out2; 00119 00120 /* extract lower 16 bits to 32 bit result */ 00121 out4 = in2 << 16u; 00122 00123 #endif // #ifndef ARM_MATH_BIG_ENDIAN 00124 00125 pDst[2] = out3; 00126 00127 #ifndef ARM_MATH_BIG_ENDIAN 00128 00129 /* extract lower 16 bits to 32 bit result */ 00130 out1 = in3 << 16u; 00131 00132 /* store result to destination */ 00133 pDst[3] = out4; 00134 00135 /* extract upper 16 bits to 32 bit result */ 00136 out2 = in3 & 0xFFFF0000; 00137 00138 #else 00139 00140 /* extract upper 16 bits to 32 bit result */ 00141 out1 = in3 & 0xFFFF0000; 00142 00143 /* store result to destination */ 00144 pDst[3] = out4; 00145 00146 /* extract lower 16 bits to 32 bit result */ 00147 out2 = in3 << 16u; 00148 00149 #endif // #ifndef ARM_MATH_BIG_ENDIAN 00150 00151 /* store result to destination */ 00152 pDst[4] = out1; 00153 00154 /* extract upper 16 bits to 32 bit result */ 00155 out3 = in4 & 0xFFFF0000; 00156 00157 pDst[5] = out2; 00158 00159 /* extract lower 16 bits to 32 bit result */ 00160 out4 = in4 << 16u; 00161 00162 #ifndef ARM_MATH_BIG_ENDIAN 00163 00164 /* store result to destination */ 00165 pDst[7] = out3; 00166 00167 /* increment input pointer */ 00168 pIn += 8u; 00169 00170 /* store result to destination */ 00171 pDst[6] = out4; 00172 00173 #else 00174 00175 /* store result to destination */ 00176 pDst[6] = out3; 00177 00178 /* increment input pointer */ 00179 pIn += 8u; 00180 00181 /* store result to destination */ 00182 pDst[7] = out4; 00183 00184 #endif // #ifndef ARM_MATH_BIG_ENDIAN 00185 00186 /* increment destination pointer */ 00187 pDst += 8u; 00188 00189 /* Decrement the loop counter */ 00190 blkCnt--; 00191 } 00192 00193 /* If the blockSize is not a multiple of 8, compute any remaining output samples here. 00194 ** No loop unrolling is used. */ 00195 blkCnt = blockSize % 0x8u; 00196 00197 while(blkCnt > 0u) 00198 { 00199 /* C = (q31_t)A << 16 */ 00200 /* convert from q15 to q31 and then store the results in the destination buffer */ 00201 *pDst++ = (q31_t) * pIn++ << 16; 00202 00203 /* Decrement the loop counter */ 00204 blkCnt--; 00205 } 00206 00207 } 00208
