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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/MatrixFunctions/arm_mat_sub_f32.c
1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
8 * Title: arm_mat_sub_f32.c
10 * Description: Floating-point matrix subtraction.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the
23 * - Neither the name of ARM LIMITED nor the names of its contributors
24 * may be used to endorse or promote products derived from this
25 * software without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 * -------------------------------------------------------------------- */
44 * @ingroup groupMatrix
48 * @defgroup MatrixSub Matrix Subtraction
50 * Subtract two matrices.
51 * \image html MatrixSubtraction.gif "Subraction of two 3 x 3 matrices"
53 * The functions check to make sure that
54 * <code>pSrcA</code>, <code>pSrcB</code>, and <code>pDst</code> have the same
55 * number of rows and columns.
59 * @addtogroup MatrixSub
64 * @brief Floating-point matrix subtraction
65 * @param[in] *pSrcA points to the first input matrix structure
66 * @param[in] *pSrcB points to the second input matrix structure
67 * @param[out] *pDst points to output matrix structure
68 * @return The function returns either
69 * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
72 arm_status
arm_mat_sub_f32(
73 const arm_matrix_instance_f32
* pSrcA
,
74 const arm_matrix_instance_f32
* pSrcB
,
75 arm_matrix_instance_f32
* pDst
)
77 float32_t
*pIn1
= pSrcA
->pData
; /* input data matrix pointer A */
78 float32_t
*pIn2
= pSrcB
->pData
; /* input data matrix pointer B */
79 float32_t
*pOut
= pDst
->pData
; /* output data matrix pointer */
81 #ifndef ARM_MATH_CM0_FAMILY
83 float32_t inA1
, inA2
, inB1
, inB2
, out1
, out2
; /* temporary variables */
85 #endif // #ifndef ARM_MATH_CM0_FAMILY
87 uint32_t numSamples
; /* total number of elements in the matrix */
88 uint32_t blkCnt
; /* loop counters */
89 arm_status status
; /* status of matrix subtraction */
91 #ifdef ARM_MATH_MATRIX_CHECK
92 /* Check for matrix mismatch condition */
93 if((pSrcA
->numRows
!= pSrcB
->numRows
) ||
94 (pSrcA
->numCols
!= pSrcB
->numCols
) ||
95 (pSrcA
->numRows
!= pDst
->numRows
) || (pSrcA
->numCols
!= pDst
->numCols
))
97 /* Set status as ARM_MATH_SIZE_MISMATCH */
98 status
= ARM_MATH_SIZE_MISMATCH
;
101 #endif /* #ifdef ARM_MATH_MATRIX_CHECK */
103 /* Total number of samples in the input matrix */
104 numSamples
= (uint32_t) pSrcA
->numRows
* pSrcA
->numCols
;
106 #ifndef ARM_MATH_CM0_FAMILY
108 /* Run the below code for Cortex-M4 and Cortex-M3 */
111 blkCnt
= numSamples
>> 2u;
113 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
114 ** a second loop below computes the remaining 1 to 3 samples. */
117 /* C(m,n) = A(m,n) - B(m,n) */
118 /* Subtract and then store the results in the destination buffer. */
119 /* Read values from source A */
122 /* Read values from source B */
125 /* Read values from source A */
128 /* out = sourceA - sourceB */
131 /* Read values from source B */
134 /* Read values from source A */
137 /* out = sourceA - sourceB */
140 /* Read values from source B */
143 /* Store result in destination */
147 /* Read values from source A */
150 /* Read values from source B */
153 /* out = sourceA - sourceB */
157 /* out = sourceA - sourceB */
160 /* Store result in destination */
163 /* Store result in destination */
167 /* update pointers to process next sampels */
172 /* Decrement the loop counter */
176 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
177 ** No loop unrolling is used. */
178 blkCnt
= numSamples
% 0x4u
;
182 /* Run the below code for Cortex-M0 */
184 /* Initialize blkCnt with number of samples */
187 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
191 /* C(m,n) = A(m,n) - B(m,n) */
192 /* Subtract and then store the results in the destination buffer. */
193 *pOut
++ = (*pIn1
++) - (*pIn2
++);
195 /* Decrement the loop counter */
199 /* Set status as ARM_MATH_SUCCESS */
200 status
= ARM_MATH_SUCCESS
;
203 /* Return to application */
208 * @} end of MatrixSub group