00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. July 2011 00005 * $Revision: V1.0.10 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/Cortex-M0 00013 * 00014 * Version 1.0.10 2011/7/15 00015 * Big Endian support added and Merged M0 and M3/M4 Source code. 00016 * 00017 * Version 1.0.3 2010/11/29 00018 * Re-organized the CMSIS folders and updated documentation. 00019 * 00020 * Version 1.0.2 2010/11/11 00021 * Documentation updated. 00022 * 00023 * Version 1.0.1 2010/10/05 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 1.0.0 2010/09/20 00027 * Production release and review comments incorporated. 00028 * 00029 * Version 0.0.5 2010/04/26 00030 * incorporated review comments and updated with latest CMSIS layer 00031 * 00032 * Version 0.0.3 2010/03/10 00033 * Initial version 00034 * -------------------------------------------------------------------- */ 00035 00036 #include "arm_math.h" 00037 00067 arm_status arm_mat_sub_f32( 00068 const arm_matrix_instance_f32 * pSrcA, 00069 const arm_matrix_instance_f32 * pSrcB, 00070 arm_matrix_instance_f32 * pDst) 00071 { 00072 float32_t *pIn1 = pSrcA->pData; /* input data matrix pointer A */ 00073 float32_t *pIn2 = pSrcB->pData; /* input data matrix pointer B */ 00074 float32_t *pOut = pDst->pData; /* output data matrix pointer */ 00075 uint32_t numSamples; /* total number of elements in the matrix */ 00076 uint32_t blkCnt; /* loop counters */ 00077 arm_status status; /* status of matrix subtraction */ 00078 00079 #ifdef ARM_MATH_MATRIX_CHECK 00080 00081 00082 /* Check for matrix mismatch condition */ 00083 if((pSrcA->numRows != pSrcB->numRows) || 00084 (pSrcA->numCols != pSrcB->numCols) || 00085 (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols)) 00086 { 00087 /* Set status as ARM_MATH_SIZE_MISMATCH */ 00088 status = ARM_MATH_SIZE_MISMATCH; 00089 } 00090 else 00091 #endif /* #ifdef ARM_MATH_MATRIX_CHECK */ 00092 00093 { 00094 /* Total number of samples in the input matrix */ 00095 numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols; 00096 00097 #ifndef ARM_MATH_CM0 00098 00099 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00100 00101 /* Loop Unrolling */ 00102 blkCnt = numSamples >> 2u; 00103 00104 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00105 ** a second loop below computes the remaining 1 to 3 samples. */ 00106 while(blkCnt > 0u) 00107 { 00108 /* C(m,n) = A(m,n) - B(m,n) */ 00109 /* Subtract and then store the results in the destination buffer. */ 00110 *pOut++ = (*pIn1++) - (*pIn2++); 00111 *pOut++ = (*pIn1++) - (*pIn2++); 00112 *pOut++ = (*pIn1++) - (*pIn2++); 00113 *pOut++ = (*pIn1++) - (*pIn2++); 00114 00115 /* Decrement the loop counter */ 00116 blkCnt--; 00117 } 00118 00119 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00120 ** No loop unrolling is used. */ 00121 blkCnt = numSamples % 0x4u; 00122 00123 #else 00124 00125 /* Run the below code for Cortex-M0 */ 00126 00127 /* Initialize blkCnt with number of samples */ 00128 blkCnt = numSamples; 00129 00130 #endif /* #ifndef ARM_MATH_CM0 */ 00131 00132 while(blkCnt > 0u) 00133 { 00134 /* C(m,n) = A(m,n) - B(m,n) */ 00135 /* Subtract and then store the results in the destination buffer. */ 00136 *pOut++ = (*pIn1++) - (*pIn2++); 00137 00138 /* Decrement the loop counter */ 00139 blkCnt--; 00140 } 00141 /* Set status as ARM_MATH_SUCCESS */ 00142 status = ARM_MATH_SUCCESS; 00143 } 00144 00145 /* Return to application */ 00146 return (status); 00147 } 00148