arm_q7_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_q7_to_q31.c 00009 * 00010 * Description: Converts the elements of the Q7 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_q7_to_q31( 00058 q7_t * pSrc, 00059 q31_t * pDst, 00060 uint32_t blockSize) 00061 { 00062 q7_t *pIn = pSrc; /* Src pointer */ 00063 uint32_t blkCnt; /* loop counter */ 00064 q31_t out1, out2, out3, out4; 00065 q31_t input1, input2; 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 << 24 */ 00075 /* convert from q7 to q31 and then store the results in the destination buffer */ 00076 00077 /* read 4 samples at a time */ 00078 input1 = *__SIMD32(pIn)++; 00079 input2 = *__SIMD32(pIn)++; 00080 00081 /* extract q7_t value and convert it to q31_t value */ 00082 out1 = (input1 >> 24) << 24; 00083 out2 = (input1 >> 16) << 24; 00084 out3 = (input1 >> 8) << 24; 00085 out4 = (input1 << 24); 00086 00087 /* store result samples to destination */ 00088 #ifndef ARM_MATH_BIG_ENDIAN 00089 00090 pDst[3] = out1; 00091 pDst[2] = out2; 00092 pDst[1] = out3; 00093 pDst[0] = out4; 00094 00095 #else 00096 00097 pDst[0] = out1; 00098 pDst[1] = out2; 00099 pDst[2] = out3; 00100 pDst[3] = out4; 00101 00102 #endif // #ifndef ARM_MATH_BIG_ENDIAN 00103 00104 /* extract q7_t value and convert it to q31_t value */ 00105 out1 = (input2 >> 24) << 24; 00106 out2 = (input2 >> 16) << 24; 00107 out3 = (input2 >> 8) << 24; 00108 out4 = (input2 << 24); 00109 00110 /* store result samples to destination */ 00111 #ifndef ARM_MATH_BIG_ENDIAN 00112 00113 pDst[7] = out1; 00114 pDst[6] = out2; 00115 pDst[5] = out3; 00116 pDst[4] = out4; 00117 00118 #else 00119 00120 pDst[4] = out1; 00121 pDst[5] = out2; 00122 pDst[6] = out3; 00123 pDst[7] = out4; 00124 00125 #endif // #ifndef ARM_MATH_BIG_ENDIAN 00126 00127 pDst += 8u; 00128 00129 /* Decrement the loop counter */ 00130 blkCnt--; 00131 } 00132 00133 /* If the blockSize is not a multiple of 8, compute any remaining output samples here. 00134 ** No loop unrolling is used. */ 00135 blkCnt = blockSize % 0x8u; 00136 00137 while(blkCnt > 0u) 00138 { 00139 /* C = (q31_t) A << 24 */ 00140 /* convert from q7 to q31 and then store the results in the destination buffer */ 00141 *pDst++ = (q31_t) * pIn++ << 24; 00142 00143 /* Decrement the loop counter */ 00144 blkCnt--; 00145 } 00146 00147 } 00148
