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_fill_q7.c 00009 * 00010 * Description: Fills a constant value into a Q7 vector. 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 00053 void arm_fill_q7( 00054 q7_t value, 00055 q7_t * pDst, 00056 uint32_t blockSize) 00057 { 00058 uint32_t blkCnt; /* loop counter */ 00059 00060 #ifndef ARM_MATH_CM0 00061 00062 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00063 00064 q31_t packedValue; /* value packed to 32 bits */ 00065 00066 /*loop Unrolling */ 00067 blkCnt = blockSize >> 2u; 00068 00069 /* Packing four 8 bit values to 32 bit value in order to use SIMD */ 00070 packedValue = __PACKq7(value, value, value, value); 00071 00072 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00073 ** a second loop below computes the remaining 1 to 3 samples. */ 00074 while(blkCnt > 0u) 00075 { 00076 /* C = value */ 00077 /* Fill the value in the destination buffer */ 00078 *__SIMD32(pDst)++ = packedValue; 00079 00080 /* Decrement the loop counter */ 00081 blkCnt--; 00082 } 00083 00084 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00085 ** No loop unrolling is used. */ 00086 blkCnt = blockSize % 0x4u; 00087 00088 #else 00089 00090 /* Run the below code for Cortex-M0 */ 00091 00092 /* Loop over blockSize number of values */ 00093 blkCnt = blockSize; 00094 00095 #endif /* #ifndef ARM_MATH_CM0 */ 00096 00097 while(blkCnt > 0u) 00098 { 00099 /* C = value */ 00100 /* Fill the value in the destination buffer */ 00101 *pDst++ = value; 00102 00103 /* Decrement the loop counter */ 00104 blkCnt--; 00105 } 00106 } 00107