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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/MatrixFunctions/arm_mat_mult_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_mult_f32.c
10 * Description: Floating-point matrix multiplication.
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 MatrixMult Matrix Multiplication
50 * Multiplies two matrices.
52 * \image html MatrixMultiplication.gif "Multiplication of two 3 x 3 matrices"
54 * Matrix multiplication is only defined if the number of columns of the
55 * first matrix equals the number of rows of the second matrix.
56 * Multiplying an <code>M x N</code> matrix with an <code>N x P</code> matrix results
57 * in an <code>M x P</code> matrix.
58 * When matrix size checking is enabled, the functions check: (1) that the inner dimensions of
59 * <code>pSrcA</code> and <code>pSrcB</code> are equal; and (2) that the size of the output
60 * matrix equals the outer dimensions of <code>pSrcA</code> and <code>pSrcB</code>.
65 * @addtogroup MatrixMult
70 * @brief Floating-point matrix multiplication.
71 * @param[in] *pSrcA points to the first input matrix structure
72 * @param[in] *pSrcB points to the second input matrix structure
73 * @param[out] *pDst points to output matrix structure
74 * @return The function returns either
75 * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
78 arm_status
arm_mat_mult_f32(
79 const arm_matrix_instance_f32
* pSrcA
,
80 const arm_matrix_instance_f32
* pSrcB
,
81 arm_matrix_instance_f32
* pDst
)
83 float32_t
*pIn1
= pSrcA
->pData
; /* input data matrix pointer A */
84 float32_t
*pIn2
= pSrcB
->pData
; /* input data matrix pointer B */
85 float32_t
*pInA
= pSrcA
->pData
; /* input data matrix pointer A */
86 float32_t
*pOut
= pDst
->pData
; /* output data matrix pointer */
87 float32_t
*px
; /* Temporary output data matrix pointer */
88 float32_t sum
; /* Accumulator */
89 uint16_t numRowsA
= pSrcA
->numRows
; /* number of rows of input matrix A */
90 uint16_t numColsB
= pSrcB
->numCols
; /* number of columns of input matrix B */
91 uint16_t numColsA
= pSrcA
->numCols
; /* number of columns of input matrix A */
93 #ifndef ARM_MATH_CM0_FAMILY
95 /* Run the below code for Cortex-M4 and Cortex-M3 */
97 float32_t in1
, in2
, in3
, in4
;
98 uint16_t col
, i
= 0u, j
, row
= numRowsA
, colCnt
; /* loop counters */
99 arm_status status
; /* status of matrix multiplication */
101 #ifdef ARM_MATH_MATRIX_CHECK
104 /* Check for matrix mismatch condition */
105 if((pSrcA
->numCols
!= pSrcB
->numRows
) ||
106 (pSrcA
->numRows
!= pDst
->numRows
) || (pSrcB
->numCols
!= pDst
->numCols
))
109 /* Set status as ARM_MATH_SIZE_MISMATCH */
110 status
= ARM_MATH_SIZE_MISMATCH
;
113 #endif /* #ifdef ARM_MATH_MATRIX_CHECK */
116 /* The following loop performs the dot-product of each row in pSrcA with each column in pSrcB */
120 /* Output pointer is set to starting address of the row being processed */
123 /* For every row wise process, the column loop counter is to be initiated */
126 /* For every row wise process, the pIn2 pointer is set
127 ** to the starting address of the pSrcB data */
135 /* Set the variable sum, that acts as accumulator, to zero */
138 /* Initiate the pointer pIn1 to point to the starting address of the column being processed */
141 /* Apply loop unrolling and compute 4 MACs simultaneously. */
142 colCnt
= numColsA
>> 2u;
144 /* matrix multiplication */
147 /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */
167 /* Decrement the loop count */
171 /* If the columns of pSrcA is not a multiple of 4, compute any remaining MACs here.
172 ** No loop unrolling is used. */
173 colCnt
= numColsA
% 0x4u
;
177 /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */
178 sum
+= *pIn1
++ * (*pIn2
);
181 /* Decrement the loop counter */
185 /* Store the result in the destination buffer */
188 /* Update the pointer pIn2 to point to the starting address of the next column */
190 pIn2
= pSrcB
->pData
+ j
;
192 /* Decrement the column loop counter */
199 /* Run the below code for Cortex-M0 */
201 float32_t
*pInB
= pSrcB
->pData
; /* input data matrix pointer B */
202 uint16_t col
, i
= 0u, row
= numRowsA
, colCnt
; /* loop counters */
203 arm_status status
; /* status of matrix multiplication */
205 #ifdef ARM_MATH_MATRIX_CHECK
207 /* Check for matrix mismatch condition */
208 if((pSrcA
->numCols
!= pSrcB
->numRows
) ||
209 (pSrcA
->numRows
!= pDst
->numRows
) || (pSrcB
->numCols
!= pDst
->numCols
))
212 /* Set status as ARM_MATH_SIZE_MISMATCH */
213 status
= ARM_MATH_SIZE_MISMATCH
;
216 #endif /* #ifdef ARM_MATH_MATRIX_CHECK */
219 /* The following loop performs the dot-product of each row in pInA with each column in pInB */
223 /* Output pointer is set to starting address of the row being processed */
226 /* For every row wise process, the column loop counter is to be initiated */
229 /* For every row wise process, the pIn2 pointer is set
230 ** to the starting address of the pSrcB data */
236 /* Set the variable sum, that acts as accumulator, to zero */
239 /* Initialize the pointer pIn1 to point to the starting address of the row being processed */
242 /* Matrix A columns number of MAC operations are to be performed */
247 /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */
248 sum
+= *pIn1
++ * (*pIn2
);
251 /* Decrement the loop counter */
255 /* Store the result in the destination buffer */
258 /* Decrement the column loop counter */
261 /* Update the pointer pIn2 to point to the starting address of the next column */
262 pIn2
= pInB
+ (numColsB
- col
);
266 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
268 /* Update the pointer pInA to point to the starting address of the next row */
270 pInA
= pInA
+ numColsA
;
272 /* Decrement the row loop counter */
276 /* Set status as ARM_MATH_SUCCESS */
277 status
= ARM_MATH_SUCCESS
;
280 /* Return to application */
285 * @} end of MatrixMult group