CMSIS DSP Software Library: arm_mat_sub_f32.c Source File
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arm_mat_sub_f32.c
Go to the documentation of this file.00001 /* ----------------------------------------------------------------------
00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
00003 *
00004 * $Date: 29. November 2010
00005 * $Revision: V1.0.3
00006 *
00007 * Project: CMSIS DSP Library
00008 * Title: arm_mat_sub_f32.c
00009 *
00010 * Description: Floating-point matrix subtraction.
00011 *
00012 * Target Processor: Cortex-M4/Cortex-M3
00013 *
00014 * Version 1.0.3 2010/11/29
00015 * Re-organized the CMSIS folders and updated documentation.
00016 *
00017 * Version 1.0.2 2010/11/11
00018 * Documentation updated.
00019 *
00020 * Version 1.0.1 2010/10/05
00021 * Production release and review comments incorporated.
00022 *
00023 * Version 1.0.0 2010/09/20
00024 * Production release and review comments incorporated.
00025 *
00026 * Version 0.0.5 2010/04/26
00027 * incorporated review comments and updated with latest CMSIS layer
00028 *
00029 * Version 0.0.3 2010/03/10
00030 * Initial version
00031 * -------------------------------------------------------------------- */
00032
00033 #include "arm_math.h"
00034
00064 arm_status arm_mat_sub_f32(
00065 const arm_matrix_instance_f32 * pSrcA,
00066 const arm_matrix_instance_f32 * pSrcB,
00067 arm_matrix_instance_f32 * pDst)
00068 {
00069 float32_t *pIn1 = pSrcA->pData; /* input data matrix pointer A */
00070 float32_t *pIn2 = pSrcB->pData; /* input data matrix pointer B */
00071 float32_t *pOut = pDst->pData; /* output data matrix pointer */
00072 uint32_t numSamples; /* total number of elements in the matrix */
00073 uint32_t blkCnt; /* loop counters */
00074 arm_status status; /* status of matrix subtraction */
00075
00076 #ifdef ARM_MATH_MATRIX_CHECK
00077 /* Check for matrix mismatch condition */
00078 if((pSrcA->numRows != pSrcB->numRows) ||
00079 (pSrcA->numCols != pSrcB->numCols) ||
00080 (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
00081 {
00082 /* Set status as ARM_MATH_SIZE_MISMATCH */
00083 status = ARM_MATH_SIZE_MISMATCH;
00084 }
00085 else
00086 #endif
00087 {
00088 /* Total number of samples in the input matrix */
00089 numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
00090
00091 /* Loop Unrolling */
00092 blkCnt = numSamples >> 2u;
00093
00094 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
00095 ** a second loop below computes the remaining 1 to 3 samples. */
00096 while(blkCnt > 0u)
00097 {
00098 /* C(m,n) = A(m,n) - B(m,n) */
00099 /* Subtract and then store the results in the destination buffer. */
00100 *pOut++ = (*pIn1++) - (*pIn2++);
00101 *pOut++ = (*pIn1++) - (*pIn2++);
00102 *pOut++ = (*pIn1++) - (*pIn2++);
00103 *pOut++ = (*pIn1++) - (*pIn2++);
00104
00105 /* Decrement the loop counter */
00106 blkCnt--;
00107 }
00108
00109 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
00110 ** No loop unrolling is used. */
00111 blkCnt = numSamples % 0x4u;
00112
00113 while(blkCnt > 0u)
00114 {
00115 /* C(m,n) = A(m,n) - B(m,n) */
00116 /* Subtract and then store the results in the destination buffer. */
00117 *pOut++ = (*pIn1++) - (*pIn2++);
00118
00119 /* Decrement the loop counter */
00120 blkCnt--;
00121 }
00122
00123 /* Set status as ARM_MATH_SUCCESS */
00124 status = ARM_MATH_SUCCESS;
00125 }
00126
00127 /* Return to application */
00128 return (status);
00129 }
00130
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