From 96d6da4e252b06dcfdc041e7df23e86161c33007 Mon Sep 17 00:00:00 2001
From: rihab kouki <rihab.kouki@st.com>
Date: Tue, 28 Jul 2020 11:24:49 +0100
Subject: Official ARM version: v5.6.0

---
 DSP/Source/BasicMathFunctions/arm_negate_q7.c | 101 +++++++++++++++-----------
 1 file changed, 57 insertions(+), 44 deletions(-)

(limited to 'DSP/Source/BasicMathFunctions/arm_negate_q7.c')

diff --git a/DSP/Source/BasicMathFunctions/arm_negate_q7.c b/DSP/Source/BasicMathFunctions/arm_negate_q7.c
index d72c317..40a373e 100644
--- a/DSP/Source/BasicMathFunctions/arm_negate_q7.c
+++ b/DSP/Source/BasicMathFunctions/arm_negate_q7.c
@@ -3,13 +3,13 @@
  * Title:        arm_negate_q7.c
  * Description:  Negates Q7 vectors
  *
- * $Date:        27. January 2017
- * $Revision:    V.1.5.1
+ * $Date:        18. March 2019
+ * $Revision:    V1.6.0
  *
  * Target Processor: Cortex-M cores
  * -------------------------------------------------------------------- */
 /*
- * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
+ * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -29,85 +29,98 @@
 #include "arm_math.h"
 
 /**
- * @ingroup groupMath
+  @ingroup groupMath
  */
 
 /**
- * @addtogroup negate
- * @{
+  @addtogroup BasicNegate
+  @{
  */
 
 /**
- * @brief  Negates the elements of a Q7 vector.
- * @param[in]  *pSrc points to the input vector
- * @param[out]  *pDst points to the output vector
- * @param[in]  blockSize number of samples in the vector
- * @return none.
- *
- * <b>Scaling and Overflow Behavior:</b>
- * \par
- * The function uses saturating arithmetic.
- * The Q7 value -1 (0x80) will be saturated to the maximum allowable positive value 0x7F.
+  @brief         Negates the elements of a Q7 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           Scaling and Overflow Behavior
+                   The function uses saturating arithmetic.
+                   The Q7 value -1 (0x80) is saturated to the maximum allowable positive value 0x7F.
  */
 
 void arm_negate_q7(
-  q7_t * pSrc,
-  q7_t * pDst,
-  uint32_t blockSize)
+  const q7_t * pSrc,
+        q7_t * pDst,
+        uint32_t blockSize)
 {
-  uint32_t blkCnt;                               /* loop counter */
-  q7_t in;
-
-#if defined (ARM_MATH_DSP)
+        uint32_t blkCnt;                               /* Loop counter */
+        q7_t in;                                       /* Temporary input variable */
 
-/* Run the below code for Cortex-M4 and Cortex-M3 */
-  q31_t input;                                   /* Input values1-4 */
-  q31_t zero = 0x00000000;
+#if defined (ARM_MATH_LOOPUNROLL)
 
+#if defined (ARM_MATH_DSP)
+  q31_t in1;                                    /* Temporary input variable */
+#endif
 
-  /*loop Unrolling */
+  /* Loop unrolling: Compute 4 outputs at a time */
   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 */
-    /* Read four inputs */
-    input = *__SIMD32(pSrc)++;
 
-    /* Store the Negated results in the destination buffer in a single cycle by packing the results */
-    *__SIMD32(pDst)++ = __QSUB8(zero, input);
+#if defined (ARM_MATH_DSP)
+    /* Negate and store result in destination buffer (4 samples at a time). */
+    in1 = read_q7x4_ia ((q7_t **) &pSrc);
+    write_q7x4_ia (&pDst, __QSUB8(0, in1));
+#else
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
 
-    /* Decrement the loop counter */
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+#endif
+
+    /* Decrement loop counter */
     blkCnt--;
   }
 
-  /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
-   ** No loop unrolling is used. */
+  /* Loop unrolling: Compute remaining outputs */
   blkCnt = blockSize % 0x4U;
 
 #else
 
-  /* Run the below code for Cortex-M0 */
-
   /* Initialize blkCnt with number of samples */
   blkCnt = blockSize;
 
-#endif /* #if defined (ARM_MATH_DSP) */
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
 
   while (blkCnt > 0U)
   {
     /* C = -A */
-    /* Negate and then store the results in the destination buffer. */ \
-      in = *pSrc++;
-    *pDst++ = (in == (q7_t) 0x80) ? 0x7f : -in;
 
-    /* Decrement the loop counter */
+    /* Negate and store result in destination buffer. */
+    in = *pSrc++;
+
+#if defined (ARM_MATH_DSP)
+    *pDst++ = (q7_t) __QSUB(0, in);
+#else
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+#endif
+
+    /* Decrement loop counter */
     blkCnt--;
   }
+
 }
 
 /**
- * @} end of negate group
+  @} end of BasicNegate group
  */
-- 
cgit