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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_sub_f32.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_sub_f32.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_sub_f32.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_sub_f32.c b/apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_sub_f32.c new file mode 100644 index 000000000..4a660db49 --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_sub_f32.c @@ -0,0 +1,145 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_sub_f32.c
+*
+* Description: Floating-point vector subtraction.
+*
+* 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
+ */
+
+/**
+ * @defgroup BasicSub Vector Subtraction
+ *
+ * Element-by-element subtraction of two vectors.
+ *
+ * <pre>
+ * pDst[n] = pSrcA[n] - pSrcB[n], 0 <= n < blockSize.
+ * </pre>
+ *
+ * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
+ */
+
+/**
+ * @addtogroup BasicSub
+ * @{
+ */
+
+
+/**
+ * @brief Floating-point vector subtraction.
+ * @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.
+ */
+
+void arm_sub_f32(
+ float32_t * pSrcA,
+ float32_t * pSrcB,
+ float32_t * pDst,
+ uint32_t blockSize)
+{
+ uint32_t blkCnt; /* loop counter */
+
+#ifndef ARM_MATH_CM0
+
+/* Run the below code for Cortex-M4 and Cortex-M3 */
+ float32_t inA1, inA2, inA3, inA4; /* temporary variables */
+ float32_t inB1, inB2, inB3, inB4; /* temporary 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 */
+ /* Subtract and then store the results in the destination buffer. */
+ /* Read 4 input samples from sourceA and sourceB */
+ inA1 = *pSrcA;
+ inB1 = *pSrcB;
+ inA2 = *(pSrcA + 1);
+ inB2 = *(pSrcB + 1);
+ inA3 = *(pSrcA + 2);
+ inB3 = *(pSrcB + 2);
+ inA4 = *(pSrcA + 3);
+ inB4 = *(pSrcB + 3);
+
+ /* dst = srcA - srcB */
+ /* subtract and store the result */
+ *pDst = inA1 - inB1;
+ *(pDst + 1) = inA2 - inB2;
+ *(pDst + 2) = inA3 - inB3;
+ *(pDst + 3) = inA4 - inB4;
+
+
+ /* Update pointers to process next sampels */
+ pSrcA += 4u;
+ pSrcB += 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 - B */
+ /* Subtract and then store the results in the destination buffer. */
+ *pDst++ = (*pSrcA++) - (*pSrcB++);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+}
+
+/**
+ * @} end of BasicSub group
+ */
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