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arm_fill_q7.c
00001 /* ---------------------------------------------------------------------- 00002 * Project: CMSIS DSP Library 00003 * Title: arm_fill_q7.c 00004 * Description: Fills a constant value into a Q7 vector 00005 * 00006 * $Date: 27. January 2017 00007 * $Revision: V.1.5.1 00008 * 00009 * Target Processor: Cortex-M cores 00010 * -------------------------------------------------------------------- */ 00011 /* 00012 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. 00013 * 00014 * SPDX-License-Identifier: Apache-2.0 00015 * 00016 * Licensed under the Apache License, Version 2.0 (the License); you may 00017 * not use this file except in compliance with the License. 00018 * You may obtain a copy of the License at 00019 * 00020 * www.apache.org/licenses/LICENSE-2.0 00021 * 00022 * Unless required by applicable law or agreed to in writing, software 00023 * distributed under the License is distributed on an AS IS BASIS, WITHOUT 00024 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00025 * See the License for the specific language governing permissions and 00026 * limitations under the License. 00027 */ 00028 00029 #include "arm_math.h" 00030 00031 /** 00032 * @ingroup groupSupport 00033 */ 00034 00035 /** 00036 * @addtogroup Fill 00037 * @{ 00038 */ 00039 00040 /** 00041 * @brief Fills a constant value into a Q7 vector. 00042 * @param[in] value input value to be filled 00043 * @param[out] *pDst points to output vector 00044 * @param[in] blockSize length of the output vector 00045 * @return none. 00046 * 00047 */ 00048 00049 void arm_fill_q7( 00050 q7_t value, 00051 q7_t * pDst, 00052 uint32_t blockSize) 00053 { 00054 uint32_t blkCnt; /* loop counter */ 00055 00056 #if defined (ARM_MATH_DSP) 00057 00058 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00059 00060 q31_t packedValue; /* value packed to 32 bits */ 00061 00062 /*loop Unrolling */ 00063 blkCnt = blockSize >> 2U; 00064 00065 /* Packing four 8 bit values to 32 bit value in order to use SIMD */ 00066 packedValue = __PACKq7(value, value, value, value); 00067 00068 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00069 ** a second loop below computes the remaining 1 to 3 samples. */ 00070 while (blkCnt > 0U) 00071 { 00072 /* C = value */ 00073 /* Fill the value in the destination buffer */ 00074 *__SIMD32(pDst)++ = packedValue; 00075 00076 /* Decrement the loop counter */ 00077 blkCnt--; 00078 } 00079 00080 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00081 ** No loop unrolling is used. */ 00082 blkCnt = blockSize % 0x4U; 00083 00084 #else 00085 00086 /* Run the below code for Cortex-M0 */ 00087 00088 /* Loop over blockSize number of values */ 00089 blkCnt = blockSize; 00090 00091 #endif /* #if defined (ARM_MATH_DSP) */ 00092 00093 while (blkCnt > 0U) 00094 { 00095 /* C = value */ 00096 /* Fill the value in the destination buffer */ 00097 *pDst++ = value; 00098 00099 /* Decrement the loop counter */ 00100 blkCnt--; 00101 } 00102 } 00103 00104 /** 00105 * @} end of Fill group 00106 */ 00107
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