1 files changed, 171 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q15.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q15.c
new file mode 100644
index 0000000..43d5b0d
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+++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q15.c
@@ -0,0 +1,171 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_negate_q15.c
+ * Description:  Negates Q15 vectors
+ *
+ * $Date:        23 April 2021
+ * $Revision:    V1.9.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 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 "dsp/basic_math_functions.h"
+
+/**
+  @ingroup groupMath
+ */
+
+/**
+  @addtogroup BasicNegate
+  @{
+ */
+
+/**
+  @brief         Negates the elements of a Q15 vector.
+  @param[in]     pSrc       points to the input vector.
+  @param[out]    pDst       points to the output vector.
+  @param[in]     blockSize  number of samples in each vector.
+  @return        none
+
+  @par           Conditions for optimum performance
+                   Input and output buffers should be aligned by 32-bit
+  @par           Scaling and Overflow Behavior
+                   The function uses saturating arithmetic.
+                   The Q15 value -1 (0x8000) is saturated to the maximum allowable positive value 0x7FFF.
+ */
+#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+
+void arm_negate_q15(
+    const q15_t  * pSrc,
+    q15_t  * pDst,
+    uint32_t blockSize)
+{
+    uint32_t  blkCnt;           /* loop counters */
+    q15x8_t vecSrc;
+
+    /* Compute 8 outputs at a time */
+    blkCnt = blockSize >> 3;
+    while (blkCnt > 0U)
+    {
+        /*
+         * C = -A
+         * Negate and then store the results in the destination buffer.
+         */
+        vecSrc = vld1q(pSrc);
+        vst1q(pDst, vqnegq(vecSrc));
+        /*
+         * Decrement the blockSize loop counter
+         */
+        blkCnt--;
+        /*
+         * advance vector source and destination pointers
+         */
+        pSrc += 8;
+        pDst += 8;
+    }
+    /*
+     * tail
+     */
+    blkCnt = blockSize & 7;
+    if (blkCnt > 0U)
+    {
+        mve_pred16_t p0 = vctp16q(blkCnt);
+        vecSrc = vld1q(pSrc);
+        vstrhq_p(pDst, vqnegq(vecSrc), p0);
+    }
+}
+
+#else
+void arm_negate_q15(
+  const q15_t * pSrc,
+        q15_t * pDst,
+        uint32_t blockSize)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+        q15_t in;                                      /* Temporary input variable */
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+#if defined (ARM_MATH_DSP)
+  q31_t in1;                                    /* Temporary input variables */
+#endif
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C = -A */
+
+#if defined (ARM_MATH_DSP)
+    /* Negate and store result in destination buffer (2 samples at a time). */
+    in1 = read_q15x2_ia (&pSrc);
+    write_q15x2_ia (&pDst, __QSUB16(0, in1));
+
+    in1 = read_q15x2_ia (&pSrc);
+    write_q15x2_ia (&pDst, __QSUB16(0, in1));
+#else
+    in = *pSrc++;
+    *pDst++ = (in == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in;
+#endif
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = blockSize % 0x4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+  while (blkCnt > 0U)
+  {
+    /* C = -A */
+
+    /* Negate and store result in destination buffer. */
+    in = *pSrc++;
+    *pDst++ = (in == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+#endif /* defined(ARM_MATH_MVEI) */
+
+/**
+  @} end of BasicNegate group
+ */