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Diffstat (limited to 'src/modules/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_scale_q31.c')
| -rw-r--r-- | src/modules/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_scale_q31.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/src/modules/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_scale_q31.c b/src/modules/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_scale_q31.c new file mode 100644 index 000000000..8e9b50e72 --- /dev/null +++ b/src/modules/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_scale_q31.c @@ -0,0 +1,221 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_scale_q31.c
+*
+* Description: Multiplies a Q31 vector 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 0.0.7 2010/06/10
+* Misra-C changes done
+* -------------------------------------------------------------------- */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupMath
+ */
+
+/**
+ * @addtogroup scale
+ * @{
+ */
+
+/**
+ * @brief Multiplies a Q31 vector by a scalar.
+ * @param[in] *pSrc points to the input vector
+ * @param[in] scaleFract fractional portion of the scale value
+ * @param[in] shift number of bits to shift the result by
+ * @param[out] *pDst points to the output vector
+ * @param[in] blockSize number of samples in the vector
+ * @return none.
+ *
+ * <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.
+ */
+
+void arm_scale_q31(
+ q31_t * pSrc,
+ q31_t scaleFract,
+ int8_t shift,
+ q31_t * pDst,
+ uint32_t blockSize)
+{
+ int8_t kShift = shift + 1; /* Shift to apply after scaling */
+ int8_t sign = (kShift & 0x80);
+ uint32_t blkCnt; /* loop counter */
+ q31_t in, out;
+
+#ifndef ARM_MATH_CM0
+
+/* Run the below code for Cortex-M4 and Cortex-M3 */
+
+ q31_t in1, in2, in3, in4; /* temporary input variables */
+ q31_t out1, out2, out3, out4; /* temporary output variabels */
+
+
+ /*loop Unrolling */
+ blkCnt = blockSize >> 2u;
+
+ if(sign == 0u)
+ {
+ /* 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)
+ {
+ /* read four inputs from source */
+ in1 = *pSrc;
+ in2 = *(pSrc + 1);
+ in3 = *(pSrc + 2);
+ in4 = *(pSrc + 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 << kShift;
+ out2 = in2 << kShift;
+
+ /* saturate the results. */
+ if(in1 != (out1 >> kShift))
+ out1 = 0x7FFFFFFF ^ (in1 >> 31);
+
+ if(in2 != (out2 >> kShift))
+ out2 = 0x7FFFFFFF ^ (in2 >> 31);
+
+ out3 = in3 << kShift;
+ out4 = in4 << kShift;
+
+ *pDst = out1;
+ *(pDst + 1) = out2;
+
+ if(in3 != (out3 >> kShift))
+ out3 = 0x7FFFFFFF ^ (in3 >> 31);
+
+ if(in4 != (out4 >> kShift))
+ out4 = 0x7FFFFFFF ^ (in4 >> 31);
+
+ /* Store result destination */
+ *(pDst + 2) = out3;
+ *(pDst + 3) = out4;
+
+ /* Update pointers to process next sampels */
+ pSrc += 4u;
+ pDst += 4u;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ }
+ else
+ {
+ kShift = -kShift;
+
+ /* 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)
+ {
+ /* read four inputs from source */
+ in1 = *pSrc;
+ in2 = *(pSrc + 1);
+ in3 = *(pSrc + 2);
+ in4 = *(pSrc + 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 >> kShift;
+ out2 = in2 >> kShift;
+
+ out3 = in3 >> kShift;
+ out4 = in4 >> kShift;
+
+ /* Store result destination */
+ *pDst = out1;
+ *(pDst + 1) = out2;
+
+ *(pDst + 2) = out3;
+ *(pDst + 3) = out4;
+
+ /* Update pointers to process next sampels */
+ pSrc += 4u;
+ pDst += 4u;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+ }
+ /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = blockSize % 0x4u;
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+
+ /* Initialize blkCnt with number of samples */
+ blkCnt = blockSize;
+
+#endif /* #ifndef ARM_MATH_CM0 */
+
+ while(blkCnt > 0u)
+ {
+ /* C = A * scale */
+ /* Scale the input and then store the result in the destination buffer. */
+ in = *pSrc++;
+ in = ((q63_t) in * scaleFract) >> 32;
+
+ if(sign == 0)
+ {
+ out = in << kShift;
+ if(in != (out >> kShift))
+ out = 0x7FFFFFFF ^ (in >> 31);
+ }
+ else
+ {
+ out = in >> kShift;
+ }
+
+ *pDst++ = out;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+}
+
+/**
+ * @} end of scale group
+ */
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