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Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q31.c')
| -rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q31.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q31.c b/apps/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q31.c new file mode 100644 index 000000000..e5e124125 --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q31.c @@ -0,0 +1,201 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_mat_scale_q31.c
+*
+* Description: Multiplies a Q31 matrix by a scalar.
+*
+* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
+*
+* Version 1.1.0 2012/02/15
+* Updated with more optimizations, bug fixes and minor API changes.
+*
+* Version 1.0.10 2011/7/15
+* Big Endian support added and Merged M0 and M3/M4 Source code.
+*
+* Version 1.0.3 2010/11/29
+* Re-organized the CMSIS folders and updated documentation.
+*
+* Version 1.0.2 2010/11/11
+* Documentation updated.
+*
+* Version 1.0.1 2010/10/05
+* Production release and review comments incorporated.
+*
+* Version 1.0.0 2010/09/20
+* Production release and review comments incorporated.
+*
+* Version 0.0.5 2010/04/26
+* incorporated review comments and updated with latest CMSIS layer
+*
+* Version 0.0.3 2010/03/10
+* Initial version
+* -------------------------------------------------------------------- */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupMatrix
+ */
+
+/**
+ * @addtogroup MatrixScale
+ * @{
+ */
+
+/**
+ * @brief Q31 matrix scaling.
+ * @param[in] *pSrc points to input matrix
+ * @param[in] scaleFract fractional portion of the scale factor
+ * @param[in] shift number of bits to shift the result by
+ * @param[out] *pDst points to output matrix structure
+ * @return The function returns either
+ * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
+ *
+ * @details
+ * <b>Scaling and Overflow Behavior:</b>
+ * \par
+ * The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format.
+ * These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format.
+ */
+
+arm_status arm_mat_scale_q31(
+ const arm_matrix_instance_q31 * pSrc,
+ q31_t scaleFract,
+ int32_t shift,
+ arm_matrix_instance_q31 * pDst)
+{
+ q31_t *pIn = pSrc->pData; /* input data matrix pointer */
+ q31_t *pOut = pDst->pData; /* output data matrix pointer */
+ uint32_t numSamples; /* total number of elements in the matrix */
+ int32_t totShift = shift + 1; /* shift to apply after scaling */
+ uint32_t blkCnt; /* loop counters */
+ arm_status status; /* status of matrix scaling */
+ q31_t in1, in2, out1; /* temporary variabels */
+
+#ifndef ARM_MATH_CM0
+
+ q31_t in3, in4, out2, out3, out4; /* temporary variables */
+
+#endif // #ifndef ARM_MAT_CM0
+
+#ifdef ARM_MATH_MATRIX_CHECK
+ /* Check for matrix mismatch */
+ if((pSrc->numRows != pDst->numRows) || (pSrc->numCols != pDst->numCols))
+ {
+ /* Set status as ARM_MATH_SIZE_MISMATCH */
+ status = ARM_MATH_SIZE_MISMATCH;
+ }
+ else
+#endif // #ifdef ARM_MATH_MATRIX_CHECK
+ {
+ /* Total number of samples in the input matrix */
+ numSamples = (uint32_t) pSrc->numRows * pSrc->numCols;
+
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+
+ /* Loop Unrolling */
+ blkCnt = numSamples >> 2u;
+
+ /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
+ ** a second loop below computes the remaining 1 to 3 samples. */
+ while(blkCnt > 0u)
+ {
+ /* C(m,n) = A(m,n) * k */
+ /* Read values from input */
+ in1 = *pIn;
+ in2 = *(pIn + 1);
+ in3 = *(pIn + 2);
+ in4 = *(pIn + 3);
+
+ /* multiply input with scaler value */
+ in1 = ((q63_t) in1 * scaleFract) >> 32;
+ in2 = ((q63_t) in2 * scaleFract) >> 32;
+ in3 = ((q63_t) in3 * scaleFract) >> 32;
+ in4 = ((q63_t) in4 * scaleFract) >> 32;
+
+ /* apply shifting */
+ out1 = in1 << totShift;
+ out2 = in2 << totShift;
+
+ /* saturate the results. */
+ if(in1 != (out1 >> totShift))
+ out1 = 0x7FFFFFFF ^ (in1 >> 31);
+
+ if(in2 != (out2 >> totShift))
+ out2 = 0x7FFFFFFF ^ (in2 >> 31);
+
+ out3 = in3 << totShift;
+ out4 = in4 << totShift;
+
+ *pOut = out1;
+ *(pOut + 1) = out2;
+
+ if(in3 != (out3 >> totShift))
+ out3 = 0x7FFFFFFF ^ (in3 >> 31);
+
+ if(in4 != (out4 >> totShift))
+ out4 = 0x7FFFFFFF ^ (in4 >> 31);
+
+
+ *(pOut + 2) = out3;
+ *(pOut + 3) = out4;
+
+ /* update pointers to process next sampels */
+ pIn += 4u;
+ pOut += 4u;
+
+
+ /* Decrement the numSamples loop counter */
+ blkCnt--;
+ }
+
+ /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = numSamples % 0x4u;
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+
+ /* Initialize blkCnt with number of samples */
+ blkCnt = numSamples;
+
+#endif /* #ifndef ARM_MATH_CM0 */
+
+ while(blkCnt > 0u)
+ {
+ /* C(m,n) = A(m,n) * k */
+ /* Scale, saturate and then store the results in the destination buffer. */
+ in1 = *pIn++;
+
+ in2 = ((q63_t) in1 * scaleFract) >> 32;
+
+ out1 = in2 << totShift;
+
+ if(in2 != (out1 >> totShift))
+ out1 = 0x7FFFFFFF ^ (in2 >> 31);
+
+ *pOut++ = out1;
+
+ /* Decrement the numSamples loop counter */
+ blkCnt--;
+ }
+
+ /* Set status as ARM_MATH_SUCCESS */
+ status = ARM_MATH_SUCCESS;
+ }
+
+ /* Return to application */
+ return (status);
+}
+
+/**
+ * @} end of MatrixScale group
+ */
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