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_q7.c 00009 * 00010 * Description: Q7 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_q7( 00059 q7_t * pSrc, 00060 q7_t offset, 00061 q7_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 q31_t offset_packed; /* Offset packed to 32 bit */ 00070 00071 00072 /*loop Unrolling */ 00073 blkCnt = blockSize >> 2u; 00074 00075 /* Offset is packed to 32 bit in order to use SIMD32 for addition */ 00076 offset_packed = __PACKq7(offset, offset, offset, offset); 00077 00078 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00079 ** a second loop below computes the remaining 1 to 3 samples. */ 00080 while(blkCnt > 0u) 00081 { 00082 /* C = A + offset */ 00083 /* Add offset and then store the results in the destination bufferfor 4 samples at a time. */ 00084 *__SIMD32(pDst)++ = __QADD8(*__SIMD32(pSrc)++, offset_packed); 00085 00086 /* Decrement the loop counter */ 00087 blkCnt--; 00088 } 00089 00090 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00091 ** No loop unrolling is used. */ 00092 blkCnt = blockSize % 0x4u; 00093 00094 while(blkCnt > 0u) 00095 { 00096 /* C = A + offset */ 00097 /* Add offset and then store the result in the destination buffer. */ 00098 *pDst++ = (q7_t) __SSAT(*pSrc++ + offset, 8); 00099 00100 /* Decrement the loop counter */ 00101 blkCnt--; 00102 } 00103 00104 #else 00105 00106 /* Run the below code for Cortex-M0 */ 00107 00108 /* Initialize blkCnt with number of samples */ 00109 blkCnt = blockSize; 00110 00111 while(blkCnt > 0u) 00112 { 00113 /* C = A + offset */ 00114 /* Add offset and then store the result in the destination buffer. */ 00115 *pDst++ = (q7_t) __SSAT((q15_t) * pSrc++ + offset, 8); 00116 00117 /* Decrement the loop counter */ 00118 blkCnt--; 00119 } 00120 00121 #endif /* #ifndef ARM_MATH_CM0 */ 00122 00123 } 00124