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| 2 | mjames | 1 | /* ---------------------------------------------------------------------- |
| 2 | * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
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| 3 | * |
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| 4 | * $Date: 19. March 2015 |
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| 5 | * $Revision: V.1.4.5 |
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| 6 | * |
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| 7 | * Project: CMSIS DSP Library |
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| 8 | * Title: arm_mat_sub_q15.c |
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| 9 | * |
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| 10 | * Description: Q15 Matrix subtraction |
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| 11 | * |
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| 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
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| 13 | * |
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| 14 | * Redistribution and use in source and binary forms, with or without |
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| 15 | * modification, are permitted provided that the following conditions |
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| 16 | * are met: |
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| 17 | * - Redistributions of source code must retain the above copyright |
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| 18 | * notice, this list of conditions and the following disclaimer. |
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| 19 | * - Redistributions in binary form must reproduce the above copyright |
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| 20 | * notice, this list of conditions and the following disclaimer in |
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| 21 | * the documentation and/or other materials provided with the |
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| 22 | * distribution. |
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| 23 | * - Neither the name of ARM LIMITED nor the names of its contributors |
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| 24 | * may be used to endorse or promote products derived from this |
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| 25 | * software without specific prior written permission. |
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| 26 | * |
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| 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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| 30 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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| 31 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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| 33 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 34 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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| 35 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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| 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 38 | * POSSIBILITY OF SUCH DAMAGE. |
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| 39 | * -------------------------------------------------------------------- */ |
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| 40 | |||
| 41 | #include "arm_math.h" |
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| 42 | |||
| 43 | /** |
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| 44 | * @ingroup groupMatrix |
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| 45 | */ |
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| 46 | |||
| 47 | /** |
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| 48 | * @addtogroup MatrixSub |
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| 49 | * @{ |
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| 50 | */ |
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| 51 | |||
| 52 | /** |
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| 53 | * @brief Q15 matrix subtraction. |
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| 54 | * @param[in] *pSrcA points to the first input matrix structure |
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| 55 | * @param[in] *pSrcB points to the second input matrix structure |
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| 56 | * @param[out] *pDst points to output matrix structure |
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| 57 | * @return The function returns either |
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| 58 | * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking. |
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| 59 | * |
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| 60 | * <b>Scaling and Overflow Behavior:</b> |
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| 61 | * \par |
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| 62 | * The function uses saturating arithmetic. |
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| 63 | * Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated. |
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| 64 | */ |
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| 65 | |||
| 66 | arm_status arm_mat_sub_q15( |
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| 67 | const arm_matrix_instance_q15 * pSrcA, |
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| 68 | const arm_matrix_instance_q15 * pSrcB, |
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| 69 | arm_matrix_instance_q15 * pDst) |
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| 70 | { |
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| 71 | q15_t *pInA = pSrcA->pData; /* input data matrix pointer A */ |
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| 72 | q15_t *pInB = pSrcB->pData; /* input data matrix pointer B */ |
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| 73 | q15_t *pOut = pDst->pData; /* output data matrix pointer */ |
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| 74 | uint32_t numSamples; /* total number of elements in the matrix */ |
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| 75 | uint32_t blkCnt; /* loop counters */ |
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| 76 | arm_status status; /* status of matrix subtraction */ |
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| 77 | |||
| 78 | |||
| 79 | #ifdef ARM_MATH_MATRIX_CHECK |
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| 80 | |||
| 81 | |||
| 82 | /* Check for matrix mismatch condition */ |
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| 83 | if((pSrcA->numRows != pSrcB->numRows) || |
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| 84 | (pSrcA->numCols != pSrcB->numCols) || |
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| 85 | (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols)) |
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| 86 | { |
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| 87 | /* Set status as ARM_MATH_SIZE_MISMATCH */ |
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| 88 | status = ARM_MATH_SIZE_MISMATCH; |
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| 89 | } |
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| 90 | else |
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| 91 | #endif /* #ifdef ARM_MATH_MATRIX_CHECK */ |
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| 92 | |||
| 93 | { |
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| 94 | /* Total number of samples in the input matrix */ |
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| 95 | numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols; |
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| 96 | |||
| 97 | #ifndef ARM_MATH_CM0_FAMILY |
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| 98 | |||
| 99 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
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| 100 | |||
| 101 | /* Apply loop unrolling */ |
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| 102 | blkCnt = numSamples >> 2u; |
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| 103 | |||
| 104 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
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| 105 | ** a second loop below computes the remaining 1 to 3 samples. */ |
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| 106 | while(blkCnt > 0u) |
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| 107 | { |
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| 108 | /* C(m,n) = A(m,n) - B(m,n) */ |
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| 109 | /* Subtract, Saturate and then store the results in the destination buffer. */ |
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| 110 | *__SIMD32(pOut)++ = __QSUB16(*__SIMD32(pInA)++, *__SIMD32(pInB)++); |
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| 111 | *__SIMD32(pOut)++ = __QSUB16(*__SIMD32(pInA)++, *__SIMD32(pInB)++); |
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| 112 | |||
| 113 | /* Decrement the loop counter */ |
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| 114 | blkCnt--; |
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| 115 | } |
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| 116 | |||
| 117 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
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| 118 | ** No loop unrolling is used. */ |
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| 119 | blkCnt = numSamples % 0x4u; |
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| 120 | |||
| 121 | while(blkCnt > 0u) |
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| 122 | { |
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| 123 | /* C(m,n) = A(m,n) - B(m,n) */ |
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| 124 | /* Subtract and then store the results in the destination buffer. */ |
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| 125 | *pOut++ = (q15_t) __QSUB16(*pInA++, *pInB++); |
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| 126 | |||
| 127 | /* Decrement the loop counter */ |
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| 128 | blkCnt--; |
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| 129 | } |
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| 130 | |||
| 131 | #else |
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| 132 | |||
| 133 | /* Run the below code for Cortex-M0 */ |
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| 134 | |||
| 135 | /* Initialize blkCnt with number of samples */ |
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| 136 | blkCnt = numSamples; |
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| 137 | |||
| 138 | while(blkCnt > 0u) |
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| 139 | { |
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| 140 | /* C(m,n) = A(m,n) - B(m,n) */ |
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| 141 | /* Subtract and then store the results in the destination buffer. */ |
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| 142 | *pOut++ = (q15_t) __SSAT(((q31_t) * pInA++ - *pInB++), 16); |
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| 143 | |||
| 144 | /* Decrement the loop counter */ |
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| 145 | blkCnt--; |
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| 146 | } |
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| 147 | |||
| 148 | #endif /* #ifndef ARM_MATH_CM0_FAMILY */ |
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| 149 | |||
| 150 | /* Set status as ARM_MATH_SUCCESS */ |
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| 151 | status = ARM_MATH_SUCCESS; |
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| 152 | } |
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| 153 | |||
| 154 | /* Return to application */ |
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| 155 | return (status); |
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| 156 | } |
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| 157 | |||
| 158 | /** |
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| 159 | * @} end of MatrixSub group |
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| 160 | */ |