1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010 ARM Limited. All rights reserved.
7 * Project: CMSIS DSP Library
8 * Title: arm_fill_q15.c
10 * Description: Fills a constant value into a Q15 vector.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Version 1.0.10 2011/7/15
15 * Big Endian support added and Merged M0 and M3/M4 Source code.
17 * Version 1.0.3 2010/11/29
18 * Re-organized the CMSIS folders and updated documentation.
20 * Version 1.0.2 2010/11/11
21 * Documentation updated.
23 * Version 1.0.1 2010/10/05
24 * Production release and review comments incorporated.
26 * Version 1.0.0 2010/09/20
27 * Production release and review comments incorporated.
29 * Version 0.0.7 2010/06/10
30 * Misra-C changes done
31 * -------------------------------------------------------------------- */
36 * @ingroup groupSupport
45 * @brief Fills a constant value into a Q15 vector.
46 * @param[in] value input value to be filled
47 * @param[out] *pDst points to output vector
48 * @param[in] blockSize length of the output vector
58 uint32_t blkCnt; /* loop counter */
62 /* Run the below code for Cortex-M4 and Cortex-M3 */
64 q31_t packedValue; /* value packed to 32 bits */
68 blkCnt = blockSize >> 2u;
70 /* Packing two 16 bit values to 32 bit value in order to use SIMD */
71 packedValue = __PKHBT(value, value, 16u);
73 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
74 ** a second loop below computes the remaining 1 to 3 samples. */
78 /* Fill the value in the destination buffer */
79 *__SIMD32(pDst)++ = packedValue;
80 *__SIMD32(pDst)++ = packedValue;
82 /* Decrement the loop counter */
86 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
87 ** No loop unrolling is used. */
88 blkCnt = blockSize % 0x4u;
92 /* Run the below code for Cortex-M0 */
94 /* Loop over blockSize number of values */
97 #endif /* #ifndef ARM_MATH_CM0 */
102 /* Fill the value in the destination buffer */
105 /* Decrement the loop counter */
111 * @} end of Fill group