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Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c b/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c new file mode 100644 index 000000000..a44158c4f --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c @@ -0,0 +1,195 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_cmplx_mult_real_q15.c
+*
+* Description: Q15 complex by real 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.
+* -------------------------------------------------------------------- */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupCmplxMath
+ */
+
+/**
+ * @addtogroup CmplxByRealMult
+ * @{
+ */
+
+
+/**
+ * @brief Q15 complex-by-real multiplication
+ * @param[in] *pSrcCmplx points to the complex input vector
+ * @param[in] *pSrcReal points to the real input vector
+ * @param[out] *pCmplxDst points to the complex output vector
+ * @param[in] numSamples 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 Q15 range [0x8000 0x7FFF] will be saturated.
+ */
+
+void arm_cmplx_mult_real_q15(
+ q15_t * pSrcCmplx,
+ q15_t * pSrcReal,
+ q15_t * pCmplxDst,
+ uint32_t numSamples)
+{
+ q15_t in; /* Temporary variable to store input value */
+
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+ uint32_t blkCnt; /* loop counters */
+ q31_t inA1, inA2; /* Temporary variables to hold input data */
+ q31_t inB1; /* Temporary variables to hold input data */
+ q15_t out1, out2, out3, out4; /* Temporary variables to hold output data */
+ q31_t mul1, mul2, mul3, mul4; /* Temporary variables to hold intermediate data */
+
+ /* 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[2 * i] = A[2 * i] * B[i]. */
+ /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
+ /* read complex number both real and imaginary from complex input buffer */
+ inA1 = *__SIMD32(pSrcCmplx)++;
+ /* read two real values at a time from real input buffer */
+ inB1 = *__SIMD32(pSrcReal)++;
+ /* read complex number both real and imaginary from complex input buffer */
+ inA2 = *__SIMD32(pSrcCmplx)++;
+
+ /* multiply complex number with real numbers */
+#ifndef ARM_MATH_BIG_ENDIAN
+
+ mul1 = (q31_t) ((q15_t) (inA1) * (q15_t) (inB1));
+ mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1));
+ mul3 = (q31_t) ((q15_t) (inA2) * (q15_t) (inB1 >> 16));
+ mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) (inB1 >> 16));
+
+#else
+
+ mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1 >> 16));
+ mul1 = (q31_t) ((q15_t) inA1 * (q15_t) (inB1 >> 16));
+ mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) inB1);
+ mul3 = (q31_t) ((q15_t) inA2 * (q15_t) inB1);
+
+#endif // #ifndef ARM_MATH_BIG_ENDIAN
+
+ /* saturate the result */
+ out1 = (q15_t) __SSAT(mul1 >> 15u, 16);
+ out2 = (q15_t) __SSAT(mul2 >> 15u, 16);
+ out3 = (q15_t) __SSAT(mul3 >> 15u, 16);
+ out4 = (q15_t) __SSAT(mul4 >> 15u, 16);
+
+ /* pack real and imaginary outputs and store them to destination */
+ *__SIMD32(pCmplxDst)++ = __PKHBT(out1, out2, 16);
+ *__SIMD32(pCmplxDst)++ = __PKHBT(out3, out4, 16);
+
+ inA1 = *__SIMD32(pSrcCmplx)++;
+ inB1 = *__SIMD32(pSrcReal)++;
+ inA2 = *__SIMD32(pSrcCmplx)++;
+
+#ifndef ARM_MATH_BIG_ENDIAN
+
+ mul1 = (q31_t) ((q15_t) (inA1) * (q15_t) (inB1));
+ mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1));
+ mul3 = (q31_t) ((q15_t) (inA2) * (q15_t) (inB1 >> 16));
+ mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) (inB1 >> 16));
+
+#else
+
+ mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1 >> 16));
+ mul1 = (q31_t) ((q15_t) inA1 * (q15_t) (inB1 >> 16));
+ mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) inB1);
+ mul3 = (q31_t) ((q15_t) inA2 * (q15_t) inB1);
+
+#endif // #ifndef ARM_MATH_BIG_ENDIAN
+
+ out1 = (q15_t) __SSAT(mul1 >> 15u, 16);
+ out2 = (q15_t) __SSAT(mul2 >> 15u, 16);
+ out3 = (q15_t) __SSAT(mul3 >> 15u, 16);
+ out4 = (q15_t) __SSAT(mul4 >> 15u, 16);
+
+ *__SIMD32(pCmplxDst)++ = __PKHBT(out1, out2, 16);
+ *__SIMD32(pCmplxDst)++ = __PKHBT(out3, out4, 16);
+
+ /* 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;
+
+ while(blkCnt > 0u)
+ {
+ /* C[2 * i] = A[2 * i] * B[i]. */
+ /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
+ in = *pSrcReal++;
+ /* store the result in the destination buffer. */
+ *pCmplxDst++ =
+ (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
+ *pCmplxDst++ =
+ (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
+
+ /* Decrement the numSamples loop counter */
+ blkCnt--;
+ }
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+
+ while(numSamples > 0u)
+ {
+ /* realOut = realA * realB. */
+ /* imagOut = imagA * realB. */
+ in = *pSrcReal++;
+ /* store the result in the destination buffer. */
+ *pCmplxDst++ =
+ (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
+ *pCmplxDst++ =
+ (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
+
+ /* Decrement the numSamples loop counter */
+ numSamples--;
+ }
+
+#endif /* #ifndef ARM_MATH_CM0 */
+
+}
+
+/**
+ * @} end of CmplxByRealMult group
+ */
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