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author | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
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committer | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
commit | 4447282260be0780eb6e36f5e953bf56888a5688 (patch) | |
tree | 3ba1e976d998d433397343b79a0612af52075aef /apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_mult_q31.c | |
parent | 659543f852d18197f68fafee5db5671567b74f4b (diff) | |
download | px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.gz px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.bz2 px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.zip |
Integrate the interesting parts of the CMSIS 3.01 (r3p1) DSP library
Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_mult_q31.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_mult_q31.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_mult_q31.c b/apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_mult_q31.c new file mode 100644 index 000000000..37ec8e25e --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_mult_q31.c @@ -0,0 +1,143 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_mult_q31.c
+*
+* Description: Q31 vector multiplication.
+*
+* 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 groupMath
+ */
+
+/**
+ * @addtogroup BasicMult
+ * @{
+ */
+
+/**
+ * @brief Q31 vector multiplication.
+ * @param[in] *pSrcA points to the first input vector
+ * @param[in] *pSrcB points to the second input vector
+ * @param[out] *pDst points to the output vector
+ * @param[in] blockSize number of samples in each vector
+ * @return none.
+ *
+ * <b>Scaling and Overflow Behavior:</b>
+ * \par
+ * The function uses saturating arithmetic.
+ * Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.
+ */
+
+void arm_mult_q31(
+ q31_t * pSrcA,
+ q31_t * pSrcB,
+ q31_t * pDst,
+ uint32_t blockSize)
+{
+ uint32_t blkCnt; /* loop counters */
+
+#ifndef ARM_MATH_CM0
+
+/* Run the below code for Cortex-M4 and Cortex-M3 */
+ q31_t inA1, inA2, inA3, inA4; /* temporary input variables */
+ q31_t inB1, inB2, inB3, inB4; /* temporary input variables */
+ q31_t out1, out2, out3, out4; /* temporary output variables */
+
+ /* loop Unrolling */
+ blkCnt = blockSize >> 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 = A * B */
+ /* Multiply the inputs and then store the results in the destination buffer. */
+ inA1 = *pSrcA++;
+ inA2 = *pSrcA++;
+ inA3 = *pSrcA++;
+ inA4 = *pSrcA++;
+ inB1 = *pSrcB++;
+ inB2 = *pSrcB++;
+ inB3 = *pSrcB++;
+ inB4 = *pSrcB++;
+
+ out1 = ((q63_t) inA1 * inB1) >> 32;
+ out2 = ((q63_t) inA2 * inB2) >> 32;
+ out3 = ((q63_t) inA3 * inB3) >> 32;
+ out4 = ((q63_t) inA4 * inB4) >> 32;
+
+ out1 = __SSAT(out1, 31);
+ out2 = __SSAT(out2, 31);
+ out3 = __SSAT(out3, 31);
+ out4 = __SSAT(out4, 31);
+
+ *pDst++ = out1 << 1u;
+ *pDst++ = out2 << 1u;
+ *pDst++ = out3 << 1u;
+ *pDst++ = out4 << 1u;
+
+ /* Decrement the blockSize 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 * B */
+ /* Multiply the inputs and then store the results in the destination buffer. */
+ *pDst++ =
+ (q31_t) clip_q63_to_q31(((q63_t) (*pSrcA++) * (*pSrcB++)) >> 31);
+
+ /* Decrement the blockSize loop counter */
+ blkCnt--;
+ }
+}
+
+/**
+ * @} end of BasicMult group
+ */
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