mbed-os 6.10 versione
cmsis_dsp/SupportFunctions/arm_q7_to_q15.c@2:da51fb522205, 2013-05-30 (annotated)
- Committer:
- emilmont
- Date:
- Thu May 30 17:10:11 2013 +0100
- Revision:
- 2:da51fb522205
- Parent:
- 1:fdd22bb7aa52
- Child:
- 3:7a284390b0ce
Keep "cmsis-dsp" module in synch with its source
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:fdd22bb7aa52 | 1 | /* ---------------------------------------------------------------------------- |
emilmont | 1:fdd22bb7aa52 | 2 | * Copyright (C) 2010 ARM Limited. All rights reserved. |
emilmont | 1:fdd22bb7aa52 | 3 | * |
emilmont | 1:fdd22bb7aa52 | 4 | * $Date: 15. February 2012 |
emilmont | 2:da51fb522205 | 5 | * $Revision: V1.1.0 |
emilmont | 1:fdd22bb7aa52 | 6 | * |
emilmont | 2:da51fb522205 | 7 | * Project: CMSIS DSP Library |
emilmont | 2:da51fb522205 | 8 | * Title: arm_q7_to_q15.c |
emilmont | 1:fdd22bb7aa52 | 9 | * |
emilmont | 2:da51fb522205 | 10 | * Description: Converts the elements of the Q7 vector to Q15 vector. |
emilmont | 1:fdd22bb7aa52 | 11 | * |
emilmont | 1:fdd22bb7aa52 | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emilmont | 1:fdd22bb7aa52 | 13 | * |
emilmont | 1:fdd22bb7aa52 | 14 | * Version 1.1.0 2012/02/15 |
emilmont | 1:fdd22bb7aa52 | 15 | * Updated with more optimizations, bug fixes and minor API changes. |
emilmont | 1:fdd22bb7aa52 | 16 | * |
emilmont | 1:fdd22bb7aa52 | 17 | * Version 1.0.10 2011/7/15 |
emilmont | 1:fdd22bb7aa52 | 18 | * Big Endian support added and Merged M0 and M3/M4 Source code. |
emilmont | 1:fdd22bb7aa52 | 19 | * |
emilmont | 1:fdd22bb7aa52 | 20 | * Version 1.0.3 2010/11/29 |
emilmont | 1:fdd22bb7aa52 | 21 | * Re-organized the CMSIS folders and updated documentation. |
emilmont | 1:fdd22bb7aa52 | 22 | * |
emilmont | 1:fdd22bb7aa52 | 23 | * Version 1.0.2 2010/11/11 |
emilmont | 1:fdd22bb7aa52 | 24 | * Documentation updated. |
emilmont | 1:fdd22bb7aa52 | 25 | * |
emilmont | 1:fdd22bb7aa52 | 26 | * Version 1.0.1 2010/10/05 |
emilmont | 1:fdd22bb7aa52 | 27 | * Production release and review comments incorporated. |
emilmont | 1:fdd22bb7aa52 | 28 | * |
emilmont | 1:fdd22bb7aa52 | 29 | * Version 1.0.0 2010/09/20 |
emilmont | 1:fdd22bb7aa52 | 30 | * Production release and review comments incorporated. |
emilmont | 1:fdd22bb7aa52 | 31 | * ---------------------------------------------------------------------------- */ |
emilmont | 1:fdd22bb7aa52 | 32 | |
emilmont | 1:fdd22bb7aa52 | 33 | #include "arm_math.h" |
emilmont | 1:fdd22bb7aa52 | 34 | |
emilmont | 1:fdd22bb7aa52 | 35 | /** |
emilmont | 1:fdd22bb7aa52 | 36 | * @ingroup groupSupport |
emilmont | 1:fdd22bb7aa52 | 37 | */ |
emilmont | 1:fdd22bb7aa52 | 38 | |
emilmont | 1:fdd22bb7aa52 | 39 | /** |
emilmont | 1:fdd22bb7aa52 | 40 | * @addtogroup q7_to_x |
emilmont | 1:fdd22bb7aa52 | 41 | * @{ |
emilmont | 1:fdd22bb7aa52 | 42 | */ |
emilmont | 1:fdd22bb7aa52 | 43 | |
emilmont | 1:fdd22bb7aa52 | 44 | |
emilmont | 1:fdd22bb7aa52 | 45 | |
emilmont | 1:fdd22bb7aa52 | 46 | |
emilmont | 1:fdd22bb7aa52 | 47 | /** |
emilmont | 1:fdd22bb7aa52 | 48 | * @brief Converts the elements of the Q7 vector to Q15 vector. |
emilmont | 1:fdd22bb7aa52 | 49 | * @param[in] *pSrc points to the Q7 input vector |
emilmont | 1:fdd22bb7aa52 | 50 | * @param[out] *pDst points to the Q15 output vector |
emilmont | 1:fdd22bb7aa52 | 51 | * @param[in] blockSize length of the input vector |
emilmont | 1:fdd22bb7aa52 | 52 | * @return none. |
emilmont | 1:fdd22bb7aa52 | 53 | * |
emilmont | 1:fdd22bb7aa52 | 54 | * \par Description: |
emilmont | 1:fdd22bb7aa52 | 55 | * |
emilmont | 1:fdd22bb7aa52 | 56 | * The equation used for the conversion process is: |
emilmont | 1:fdd22bb7aa52 | 57 | * |
emilmont | 1:fdd22bb7aa52 | 58 | * <pre> |
emilmont | 2:da51fb522205 | 59 | * pDst[n] = (q15_t) pSrc[n] << 8; 0 <= n < blockSize. |
emilmont | 1:fdd22bb7aa52 | 60 | * </pre> |
emilmont | 1:fdd22bb7aa52 | 61 | * |
emilmont | 1:fdd22bb7aa52 | 62 | */ |
emilmont | 1:fdd22bb7aa52 | 63 | |
emilmont | 1:fdd22bb7aa52 | 64 | |
emilmont | 1:fdd22bb7aa52 | 65 | void arm_q7_to_q15( |
emilmont | 1:fdd22bb7aa52 | 66 | q7_t * pSrc, |
emilmont | 1:fdd22bb7aa52 | 67 | q15_t * pDst, |
emilmont | 1:fdd22bb7aa52 | 68 | uint32_t blockSize) |
emilmont | 1:fdd22bb7aa52 | 69 | { |
emilmont | 1:fdd22bb7aa52 | 70 | q7_t *pIn = pSrc; /* Src pointer */ |
emilmont | 1:fdd22bb7aa52 | 71 | uint32_t blkCnt; /* loop counter */ |
emilmont | 1:fdd22bb7aa52 | 72 | |
emilmont | 1:fdd22bb7aa52 | 73 | #ifndef ARM_MATH_CM0 |
emilmont | 1:fdd22bb7aa52 | 74 | q31_t in; |
emilmont | 1:fdd22bb7aa52 | 75 | q31_t in1, in2; |
emilmont | 1:fdd22bb7aa52 | 76 | q31_t out1, out2; |
emilmont | 1:fdd22bb7aa52 | 77 | |
emilmont | 1:fdd22bb7aa52 | 78 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
emilmont | 1:fdd22bb7aa52 | 79 | |
emilmont | 1:fdd22bb7aa52 | 80 | /*loop Unrolling */ |
emilmont | 1:fdd22bb7aa52 | 81 | blkCnt = blockSize >> 2u; |
emilmont | 1:fdd22bb7aa52 | 82 | |
emilmont | 1:fdd22bb7aa52 | 83 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
emilmont | 1:fdd22bb7aa52 | 84 | ** a second loop below computes the remaining 1 to 3 samples. */ |
emilmont | 1:fdd22bb7aa52 | 85 | while(blkCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 86 | { |
emilmont | 1:fdd22bb7aa52 | 87 | /* C = (q15_t) A << 8 */ |
emilmont | 1:fdd22bb7aa52 | 88 | /* convert from q7 to q15 and then store the results in the destination buffer */ |
emilmont | 1:fdd22bb7aa52 | 89 | in = *__SIMD32(pIn)++; |
emilmont | 1:fdd22bb7aa52 | 90 | |
emilmont | 1:fdd22bb7aa52 | 91 | /* rotatate in by 8 and extend two q7_t values to q15_t values */ |
emilmont | 1:fdd22bb7aa52 | 92 | in1 = __SXTB16(__ROR(in, 8)); |
emilmont | 1:fdd22bb7aa52 | 93 | |
emilmont | 1:fdd22bb7aa52 | 94 | /* extend remainig two q7_t values to q15_t values */ |
emilmont | 1:fdd22bb7aa52 | 95 | in2 = __SXTB16(in); |
emilmont | 1:fdd22bb7aa52 | 96 | |
emilmont | 1:fdd22bb7aa52 | 97 | in1 = in1 << 8u; |
emilmont | 1:fdd22bb7aa52 | 98 | in2 = in2 << 8u; |
emilmont | 1:fdd22bb7aa52 | 99 | |
emilmont | 1:fdd22bb7aa52 | 100 | in1 = in1 & 0xFF00FF00; |
emilmont | 1:fdd22bb7aa52 | 101 | in2 = in2 & 0xFF00FF00; |
emilmont | 1:fdd22bb7aa52 | 102 | |
emilmont | 1:fdd22bb7aa52 | 103 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 104 | |
emilmont | 1:fdd22bb7aa52 | 105 | out2 = __PKHTB(in1, in2, 16); |
emilmont | 1:fdd22bb7aa52 | 106 | out1 = __PKHBT(in2, in1, 16); |
emilmont | 1:fdd22bb7aa52 | 107 | |
emilmont | 1:fdd22bb7aa52 | 108 | #else |
emilmont | 1:fdd22bb7aa52 | 109 | |
emilmont | 1:fdd22bb7aa52 | 110 | out1 = __PKHTB(in1, in2, 16); |
emilmont | 1:fdd22bb7aa52 | 111 | out2 = __PKHBT(in2, in1, 16); |
emilmont | 1:fdd22bb7aa52 | 112 | |
emilmont | 1:fdd22bb7aa52 | 113 | #endif |
emilmont | 1:fdd22bb7aa52 | 114 | |
emilmont | 1:fdd22bb7aa52 | 115 | *__SIMD32(pDst)++ = out1; |
emilmont | 1:fdd22bb7aa52 | 116 | *__SIMD32(pDst)++ = out2; |
emilmont | 1:fdd22bb7aa52 | 117 | |
emilmont | 1:fdd22bb7aa52 | 118 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 119 | blkCnt--; |
emilmont | 1:fdd22bb7aa52 | 120 | } |
emilmont | 1:fdd22bb7aa52 | 121 | |
emilmont | 1:fdd22bb7aa52 | 122 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
emilmont | 1:fdd22bb7aa52 | 123 | ** No loop unrolling is used. */ |
emilmont | 1:fdd22bb7aa52 | 124 | blkCnt = blockSize % 0x4u; |
emilmont | 1:fdd22bb7aa52 | 125 | |
emilmont | 1:fdd22bb7aa52 | 126 | #else |
emilmont | 1:fdd22bb7aa52 | 127 | |
emilmont | 1:fdd22bb7aa52 | 128 | /* Run the below code for Cortex-M0 */ |
emilmont | 1:fdd22bb7aa52 | 129 | |
emilmont | 1:fdd22bb7aa52 | 130 | /* Loop over blockSize number of values */ |
emilmont | 1:fdd22bb7aa52 | 131 | blkCnt = blockSize; |
emilmont | 1:fdd22bb7aa52 | 132 | |
emilmont | 1:fdd22bb7aa52 | 133 | #endif /* #ifndef ARM_MATH_CM0 */ |
emilmont | 1:fdd22bb7aa52 | 134 | |
emilmont | 1:fdd22bb7aa52 | 135 | while(blkCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 136 | { |
emilmont | 1:fdd22bb7aa52 | 137 | /* C = (q15_t) A << 8 */ |
emilmont | 1:fdd22bb7aa52 | 138 | /* convert from q7 to q15 and then store the results in the destination buffer */ |
emilmont | 1:fdd22bb7aa52 | 139 | *pDst++ = (q15_t) * pIn++ << 8; |
emilmont | 1:fdd22bb7aa52 | 140 | |
emilmont | 1:fdd22bb7aa52 | 141 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 142 | blkCnt--; |
emilmont | 1:fdd22bb7aa52 | 143 | } |
emilmont | 1:fdd22bb7aa52 | 144 | |
emilmont | 1:fdd22bb7aa52 | 145 | } |
emilmont | 1:fdd22bb7aa52 | 146 | |
emilmont | 1:fdd22bb7aa52 | 147 | /** |
emilmont | 1:fdd22bb7aa52 | 148 | * @} end of q7_to_x group |
emilmont | 1:fdd22bb7aa52 | 149 | */ |