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_q15.c 00009 * 00010 * Description: Fills a constant value into a Q15 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_q15( 00054 q15_t value, 00055 q15_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 00067 /*loop Unrolling */ 00068 blkCnt = blockSize >> 2u; 00069 00070 /* Packing two 16 bit values to 32 bit value in order to use SIMD */ 00071 packedValue = __PKHBT(value, value, 16u); 00072 00073 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00074 ** a second loop below computes the remaining 1 to 3 samples. */ 00075 while(blkCnt > 0u) 00076 { 00077 /* C = value */ 00078 /* Fill the value in the destination buffer */ 00079 *__SIMD32(pDst)++ = packedValue; 00080 *__SIMD32(pDst)++ = packedValue; 00081 00082 /* Decrement the loop counter */ 00083 blkCnt--; 00084 } 00085 00086 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00087 ** No loop unrolling is used. */ 00088 blkCnt = blockSize % 0x4u; 00089 00090 #else 00091 00092 /* Run the below code for Cortex-M0 */ 00093 00094 /* Loop over blockSize number of values */ 00095 blkCnt = blockSize; 00096 00097 #endif /* #ifndef ARM_MATH_CM0 */ 00098 00099 while(blkCnt > 0u) 00100 { 00101 /* C = value */ 00102 /* Fill the value in the destination buffer */ 00103 *pDst++ = value; 00104 00105 /* Decrement the loop counter */ 00106 blkCnt--; 00107 } 00108 } 00109