00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. July 2011 00005 * $Revision: V1.0.10 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_offset_q31.c 00009 * 00010 * Description: Q31 vector offset. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Version 1.0.10 2011/7/15 00015 * Big Endian support added and Merged M0 and M3/M4 Source code. 00016 * 00017 * Version 1.0.3 2010/11/29 00018 * Re-organized the CMSIS folders and updated documentation. 00019 * 00020 * Version 1.0.2 2010/11/11 00021 * Documentation updated. 00022 * 00023 * Version 1.0.1 2010/10/05 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 1.0.0 2010/09/20 00027 * Production release and review comments incorporated. 00028 * 00029 * Version 0.0.7 2010/06/10 00030 * Misra-C changes done 00031 * -------------------------------------------------------------------- */ 00032 00033 #include "arm_math.h" 00034 00058 void arm_offset_q31( 00059 q31_t * pSrc, 00060 q31_t offset, 00061 q31_t * pDst, 00062 uint32_t blockSize) 00063 { 00064 uint32_t blkCnt; /* loop counter */ 00065 00066 #ifndef ARM_MATH_CM0 00067 00068 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00069 00070 00071 /*loop Unrolling */ 00072 blkCnt = blockSize >> 2u; 00073 00074 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00075 ** a second loop below computes the remaining 1 to 3 samples. */ 00076 while(blkCnt > 0u) 00077 { 00078 /* C = A + offset */ 00079 /* Add offset and then store the results in the destination buffer. */ 00080 *pDst++ = __QADD(*pSrc++, offset); 00081 *pDst++ = __QADD(*pSrc++, offset); 00082 *pDst++ = __QADD(*pSrc++, offset); 00083 *pDst++ = __QADD(*pSrc++, offset); 00084 00085 /* Decrement the loop counter */ 00086 blkCnt--; 00087 } 00088 00089 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00090 ** No loop unrolling is used. */ 00091 blkCnt = blockSize % 0x4u; 00092 00093 while(blkCnt > 0u) 00094 { 00095 /* C = A + offset */ 00096 /* Add offset and then store the result in the destination buffer. */ 00097 *pDst++ = __QADD(*pSrc++, offset); 00098 00099 /* Decrement the loop counter */ 00100 blkCnt--; 00101 } 00102 00103 #else 00104 00105 /* Run the below code for Cortex-M0 */ 00106 00107 /* Initialize blkCnt with number of samples */ 00108 blkCnt = blockSize; 00109 00110 while(blkCnt > 0u) 00111 { 00112 /* C = A + offset */ 00113 /* Add offset and then store the result in the destination buffer. */ 00114 *pDst++ = (q31_t) clip_q63_to_q31((q63_t) * pSrc++ + offset); 00115 00116 /* Decrement the loop counter */ 00117 blkCnt--; 00118 } 00119 00120 #endif /* #ifndef ARM_MATH_CM0 */ 00121 00122 } 00123