Robert Lopez
Aded CMSIS5 DSP and NN folder. Needs some work
Diff: DSP/source/BasicMathFunctions/arm_shift_q7.c
- Revision:
- 0:eedb7d567a5d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/DSP/source/BasicMathFunctions/arm_shift_q7.c Thu Apr 12 01:31:58 2018 +0000
@@ -0,0 +1,209 @@
+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_shift_q7.c
+ * Description: Processing function for the Q7 Shifting
+ *
+ * $Date: 27. January 2017
+ * $Revision: V.1.5.1
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupMath
+ */
+
+/**
+ * @addtogroup shift
+ * @{
+ */
+
+
+/**
+ * @brief Shifts the elements of a Q7 vector a specified number of bits.
+ * @param[in] *pSrc points to the input vector
+ * @param[in] shiftBits number of bits to shift. A positive value shifts left; a negative value shifts right.
+ * @param[out] *pDst points to the output vector
+ * @param[in] blockSize number of samples in the vector
+ * @return none.
+ *
+ * \par Conditions for optimum performance
+ * Input and output buffers should be aligned by 32-bit
+ *
+ *
+ * <b>Scaling and Overflow Behavior:</b>
+ * \par
+ * The function uses saturating arithmetic.
+ * Results outside of the allowable Q7 range [0x8 0x7F] will be saturated.
+ */
+
+void arm_shift_q7(
+ q7_t * pSrc,
+ int8_t shiftBits,
+ q7_t * pDst,
+ uint32_t blockSize)
+{
+ uint32_t blkCnt; /* loop counter */
+ uint8_t sign; /* Sign of shiftBits */
+
+#if defined (ARM_MATH_DSP)
+
+/* Run the below code for Cortex-M4 and Cortex-M3 */
+ q7_t in1; /* Input value1 */
+ q7_t in2; /* Input value2 */
+ q7_t in3; /* Input value3 */
+ q7_t in4; /* Input value4 */
+
+
+ /*loop Unrolling */
+ blkCnt = blockSize >> 2U;
+
+ /* Getting the sign of shiftBits */
+ sign = (shiftBits & 0x80);
+
+ /* If the shift value is positive then do right shift else left shift */
+ 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)
+ {
+ /* C = A << shiftBits */
+ /* Read 4 inputs */
+ in1 = *pSrc;
+ in2 = *(pSrc + 1);
+ in3 = *(pSrc + 2);
+ in4 = *(pSrc + 3);
+
+ /* Store the Shifted result in the destination buffer in single cycle by packing the outputs */
+ *__SIMD32(pDst)++ = __PACKq7(__SSAT((in1 << shiftBits), 8),
+ __SSAT((in2 << shiftBits), 8),
+ __SSAT((in3 << shiftBits), 8),
+ __SSAT((in4 << shiftBits), 8));
+ /* Update source pointer to process next sampels */
+ pSrc += 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;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A << shiftBits */
+ /* Shift the input and then store the result in the destination buffer. */
+ *pDst++ = (q7_t) __SSAT((*pSrc++ << shiftBits), 8);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+ }
+ else
+ {
+ shiftBits = -shiftBits;
+ /* 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 >> shiftBits */
+ /* Read 4 inputs */
+ in1 = *pSrc;
+ in2 = *(pSrc + 1);
+ in3 = *(pSrc + 2);
+ in4 = *(pSrc + 3);
+
+ /* Store the Shifted result in the destination buffer in single cycle by packing the outputs */
+ *__SIMD32(pDst)++ = __PACKq7((in1 >> shiftBits), (in2 >> shiftBits),
+ (in3 >> shiftBits), (in4 >> shiftBits));
+
+
+ pSrc += 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;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A >> shiftBits */
+ /* Shift the input and then store the result in the destination buffer. */
+ in1 = *pSrc++;
+ *pDst++ = (in1 >> shiftBits);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+ }
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+
+ /* Getting the sign of shiftBits */
+ sign = (shiftBits & 0x80);
+
+ /* If the shift value is positive then do right shift else left shift */
+ if (sign == 0U)
+ {
+ /* Initialize blkCnt with number of samples */
+ blkCnt = blockSize;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A << shiftBits */
+ /* Shift the input and then store the result in the destination buffer. */
+ *pDst++ = (q7_t) __SSAT(((q15_t) * pSrc++ << shiftBits), 8);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+ }
+ else
+ {
+ /* Initialize blkCnt with number of samples */
+ blkCnt = blockSize;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A >> shiftBits */
+ /* Shift the input and then store the result in the destination buffer. */
+ *pDst++ = (*pSrc++ >> -shiftBits);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+ }
+
+#endif /* #if defined (ARM_MATH_DSP) */
+}
+
+/**
+ * @} end of shift group
+ */
+