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Diffstat (limited to 'src/modules/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_f32.c')
| -rw-r--r-- | src/modules/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_f32.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/modules/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_f32.c b/src/modules/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_f32.c new file mode 100644 index 000000000..e64cfd1d1 --- /dev/null +++ b/src/modules/mathlib/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_f32.c @@ -0,0 +1,179 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_mat_scale_f32.c
+*
+* Description: Multiplies a floating-point 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
+ */
+
+/**
+ * @defgroup MatrixScale Matrix Scale
+ *
+ * Multiplies a matrix by a scalar. This is accomplished by multiplying each element in the
+ * matrix by the scalar. For example:
+ * \image html MatrixScale.gif "Matrix Scaling of a 3 x 3 matrix"
+ *
+ * The function checks to make sure that the input and output matrices are of the same size.
+ *
+ * In the fixed-point Q15 and Q31 functions, <code>scale</code> is represented by
+ * a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>.
+ * The shift allows the gain of the scaling operation to exceed 1.0.
+ * The overall scale factor applied to the fixed-point data is
+ * <pre>
+ * scale = scaleFract * 2^shift.
+ * </pre>
+ */
+
+/**
+ * @addtogroup MatrixScale
+ * @{
+ */
+
+/**
+ * @brief Floating-point matrix scaling.
+ * @param[in] *pSrc points to input matrix structure
+ * @param[in] scale scale factor to be applied
+ * @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.
+ *
+ */
+
+arm_status arm_mat_scale_f32(
+ const arm_matrix_instance_f32 * pSrc,
+ float32_t scale,
+ arm_matrix_instance_f32 * pDst)
+{
+ float32_t *pIn = pSrc->pData; /* input data matrix pointer */
+ float32_t *pOut = pDst->pData; /* output data matrix pointer */
+ uint32_t numSamples; /* total number of elements in the matrix */
+ uint32_t blkCnt; /* loop counters */
+ arm_status status; /* status of matrix scaling */
+
+#ifndef ARM_MATH_CM0
+
+ float32_t in1, in2, in3, in4; /* temporary variables */
+ float32_t out1, out2, out3, out4; /* temporary variables */
+
+#endif // #ifndef ARM_MATH_CM0
+
+#ifdef ARM_MATH_MATRIX_CHECK
+ /* Check for matrix mismatch condition */
+ 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 >> 2;
+
+ /* 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) * scale */
+ /* Scaling and results are stored in the destination buffer. */
+ in1 = pIn[0];
+ in2 = pIn[1];
+ in3 = pIn[2];
+ in4 = pIn[3];
+
+ out1 = in1 * scale;
+ out2 = in2 * scale;
+ out3 = in3 * scale;
+ out4 = in4 * scale;
+
+
+ pOut[0] = out1;
+ pOut[1] = out2;
+ 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) * scale */
+ /* The results are stored in the destination buffer. */
+ *pOut++ = (*pIn++) * scale;
+
+ /* Decrement the 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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