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_q31.c 00009 * 00010 * Description: Q31 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 00062 arm_status arm_mat_sub_q31( 00063 const arm_matrix_instance_q31 * pSrcA, 00064 const arm_matrix_instance_q31 * pSrcB, 00065 arm_matrix_instance_q31 * pDst) 00066 { 00067 q31_t *pIn1 = pSrcA->pData; /* input data matrix pointer A */ 00068 q31_t *pIn2 = pSrcB->pData; /* input data matrix pointer B */ 00069 q31_t *pOut = pDst->pData; /* output data matrix pointer */ 00070 uint32_t numSamples; /* total number of elements in the matrix */ 00071 uint32_t blkCnt; /* loop counters */ 00072 arm_status status; /* status of matrix subtraction */ 00073 00074 00075 #ifdef ARM_MATH_MATRIX_CHECK 00076 00077 00078 /* Check for matrix mismatch condition */ 00079 if((pSrcA->numRows != pSrcB->numRows) || 00080 (pSrcA->numCols != pSrcB->numCols) || 00081 (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols)) 00082 { 00083 /* Set status as ARM_MATH_SIZE_MISMATCH */ 00084 status = ARM_MATH_SIZE_MISMATCH; 00085 } 00086 else 00087 #endif /* #ifdef ARM_MATH_MATRIX_CHECK */ 00088 00089 { 00090 /* Total number of samples in the input matrix */ 00091 numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols; 00092 00093 #ifndef ARM_MATH_CM0 00094 00095 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00096 00097 /* Loop Unrolling */ 00098 blkCnt = numSamples >> 2u; 00099 00100 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00101 ** a second loop below computes the remaining 1 to 3 samples. */ 00102 while(blkCnt > 0u) 00103 { 00104 /* C(m,n) = A(m,n) - B(m,n) */ 00105 /* Subtract, saturate and then store the results in the destination buffer. */ 00106 *pOut++ = __QSUB(*pIn1++, *pIn2++); 00107 *pOut++ = __QSUB(*pIn1++, *pIn2++); 00108 *pOut++ = __QSUB(*pIn1++, *pIn2++); 00109 *pOut++ = __QSUB(*pIn1++, *pIn2++); 00110 00111 /* Decrement the loop counter */ 00112 blkCnt--; 00113 } 00114 00115 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00116 ** No loop unrolling is used. */ 00117 blkCnt = numSamples % 0x4u; 00118 00119 while(blkCnt > 0u) 00120 { 00121 /* C(m,n) = A(m,n) - B(m,n) */ 00122 /* Subtract, saturate and then store the results in the destination buffer. */ 00123 *pOut++ = __QSUB(*pIn1++, *pIn2++); 00124 00125 /* Decrement the loop counter */ 00126 blkCnt--; 00127 } 00128 00129 #else 00130 00131 /* Run the below code for Cortex-M0 */ 00132 00133 /* Initialize blkCnt with number of samples */ 00134 blkCnt = numSamples; 00135 00136 while(blkCnt > 0u) 00137 { 00138 /* C(m,n) = A(m,n) - B(m,n) */ 00139 /* Subtract, saturate and then store the results in the destination buffer. */ 00140 *pOut++ = clip_q63_to_q31(((q63_t) (*pIn1++)) - (*pIn2++)); 00141 00142 /* Decrement the loop counter */ 00143 blkCnt--; 00144 } 00145 00146 #endif /* #ifndef ARM_MATH_CM0 */ 00147 00148 /* Set status as ARM_MATH_SUCCESS */ 00149 status = ARM_MATH_SUCCESS; 00150 } 00151 00152 /* Return to application */ 00153 return (status); 00154 } 00155