initial commit

1 files changed, 244 insertions, 0 deletions

diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c
new file mode 100644
index 0000000..4e28441
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c
@@ -0,0 +1,244 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_scale_q31.c
+ * Description:  Multiplies a Q31 vector by a scalar
+ *
+ * $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 BasicScale
+  @{
+ */
+
+/**
+  @brief         Multiplies a Q31 vector by a scalar.
+  @param[in]     pSrc       points to the input vector
+  @param[in]     scaleFract fractional portion of the scale value
+  @param[in]     shift      number of bits to shift the result by
+  @param[out]    pDst       points to the output vector
+  @param[in]     blockSize  number of samples in each vector
+  @return        none
+
+  @par           Scaling and Overflow Behavior
+                   The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format.
+                   These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format.
+ */
+
+#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+
+void arm_scale_q31(
+    const q31_t * pSrc,
+    q31_t   scaleFract,
+    int8_t  shift,
+    q31_t * pDst,
+    uint32_t blockSize)
+{
+    uint32_t  blkCnt;           /* loop counters */
+    q31x4_t vecSrc;
+    q31x4_t vecDst;
+
+    /* Compute 4 outputs at a time */
+    blkCnt = blockSize >> 2;
+    while (blkCnt > 0U)
+    {
+        /*
+         * C = A * scale
+         * Scale the input and then store the result in the destination buffer.
+         */
+        vecSrc = vld1q(pSrc);
+        vecDst = vmulhq(vecSrc, vdupq_n_s32(scaleFract));
+        vecDst = vqshlq_r(vecDst, shift + 1);
+        vst1q(pDst, vecDst);
+        /*
+         * Decrement the blockSize loop counter
+         */
+        blkCnt--;
+        /*
+         * advance vector source and destination pointers
+         */
+        pSrc += 4;
+        pDst += 4;
+    }
+    /*
+     * tail
+     */
+    blkCnt = blockSize & 3;
+    if (blkCnt > 0U)
+    {
+        mve_pred16_t p0 = vctp32q(blkCnt);
+        vecSrc = vld1q(pSrc);
+        vecDst = vmulhq(vecSrc, vdupq_n_s32(scaleFract));
+        vecDst = vqshlq_r(vecDst, shift + 1);
+        vstrwq_p(pDst, vecDst, p0);
+    }
+}
+
+#else
+void arm_scale_q31(
+  const q31_t *pSrc,
+        q31_t scaleFract,
+        int8_t shift,
+        q31_t *pDst,
+        uint32_t blockSize)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+        q31_t in, out;                                 /* Temporary variables */
+        int8_t kShift = shift + 1;                     /* Shift to apply after scaling */
+        int8_t sign = (kShift & 0x80);
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  if (sign == 0U)
+  {
+    while (blkCnt > 0U)
+    {
+      /* C = A * scale */
+
+      /* Scale input and store result in destination buffer. */
+      in = *pSrc++;                                /* read input from source */
+      in = ((q63_t) in * scaleFract) >> 32;        /* multiply input with scaler value */
+      out = in << kShift;                          /* apply shifting */
+      if (in != (out >> kShift))                   /* saturate the result */
+        out = 0x7FFFFFFF ^ (in >> 31);
+      *pDst++ = out;                               /* Store result destination */
+
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in << kShift;
+      if (in != (out >> kShift))
+        out = 0x7FFFFFFF ^ (in >> 31);
+      *pDst++ = out;
+
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in << kShift;
+      if (in != (out >> kShift))
+        out = 0x7FFFFFFF ^ (in >> 31);
+      *pDst++ = out;
+
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in << kShift;
+      if (in != (out >> kShift))
+        out = 0x7FFFFFFF ^ (in >> 31);
+      *pDst++ = out;
+
+      /* Decrement loop counter */
+      blkCnt--;
+    }
+  }
+  else
+  {
+    while (blkCnt > 0U)
+    {
+      /* C = A * scale */
+
+      /* Scale input and store result in destination buffer. */
+      in = *pSrc++;                                /* read four inputs from source */
+      in = ((q63_t) in * scaleFract) >> 32;        /* multiply input with scaler value */
+      out = in >> -kShift;                         /* apply shifting */
+      *pDst++ = out;                               /* Store result destination */
+
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in >> -kShift;
+      *pDst++ = out;
+
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in >> -kShift;
+      *pDst++ = out;
+
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in >> -kShift;
+      *pDst++ = out;
+
+      /* 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) */
+
+  if (sign == 0U)
+  {
+    while (blkCnt > 0U)
+    {
+      /* C = A * scale */
+
+      /* Scale input and store result in destination buffer. */
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in << kShift;
+      if (in != (out >> kShift))
+          out = 0x7FFFFFFF ^ (in >> 31);
+      *pDst++ = out;
+
+      /* Decrement loop counter */
+      blkCnt--;
+    }
+  }
+  else
+  {
+    while (blkCnt > 0U)
+    {
+      /* C = A * scale */
+
+      /* Scale input and store result in destination buffer. */
+      in = *pSrc++;
+      in = ((q63_t) in * scaleFract) >> 32;
+      out = in >> -kShift;
+      *pDst++ = out;
+
+      /* Decrement loop counter */
+      blkCnt--;
+    }
+  }
+
+}
+#endif /* defined(ARM_MATH_MVEI) */
+
+/**
+  @} end of BasicScale group
+ */