1 files changed, 144 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_clip_f32.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_clip_f32.c
new file mode 100644
index 0000000..4cc2799
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_clip_f32.c
@@ -0,0 +1,144 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_clip_f32.c
+ * Description:  Floating-point vector addition
+ *
+ * $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
+ */
+
+/**
+  @defgroup BasicClip Elementwise clipping
+
+  Element-by-element clipping of a value.
+
+  The value is constrained between 2 bounds.
+
+  There are separate functions for floating-point, Q7, Q15, and Q31 data types.
+ */
+
+/**
+  @addtogroup BasicClip
+  @{
+ */
+
+/**
+  @brief         Elementwise floating-point clipping
+  @param[in]     pSrc          points to input values
+  @param[out]    pDst          points to output clipped values
+  @param[in]     low           lower bound
+  @param[in]     high          higher bound
+  @param[in]     numSamples    number of samples to clip
+  @return        none
+ */
+#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+
+void arm_clip_f32(const float32_t * pSrc, 
+  float32_t * pDst, 
+  float32_t low, 
+  float32_t high, 
+  uint32_t numSamples)
+{
+    uint32_t  blkCnt;
+    f32x4_t curVec0, curVec1;
+    f32x4_t vecLow, vecHigh;
+
+    vecLow = vdupq_n_f32(low);
+    vecHigh = vdupq_n_f32(high);
+
+    curVec0 = vld1q(pSrc);
+    pSrc += 4;
+    /*
+     * unrolled x 2 to allow
+     * vldr/vstr/vmin/vmax
+     * stall free interleaving
+     */
+    blkCnt = numSamples >> 3;
+    while (blkCnt--)
+    {
+        curVec0 = vmaxnmq(curVec0, vecLow);
+        curVec1 = vld1q(pSrc);
+        pSrc += 4;
+        curVec0 = vminnmq(curVec0, vecHigh);
+        vst1q(pDst, curVec0);
+        pDst += 4;
+        curVec1 = vmaxnmq(curVec1, vecLow);
+        curVec0 = vld1q(pSrc);
+        pSrc += 4;
+        curVec1 = vminnmq(curVec1, vecHigh);
+        vst1q(pDst, curVec1);
+        pDst += 4;
+    }
+    /*
+     * Tail handling
+     */
+    blkCnt = numSamples - ((numSamples >> 3) << 3);
+    if (blkCnt >= 4)
+    {
+        curVec0 = vmaxnmq(curVec0, vecLow);
+        curVec0 = vminnmq(curVec0, vecHigh);
+        vst1q(pDst, curVec0);
+        pDst += 4;
+        curVec0 = vld1q(pSrc);
+        pSrc += 4;
+    }
+
+    if (blkCnt > 0)
+    {
+        mve_pred16_t p0 = vctp32q(blkCnt & 3);
+        curVec0 = vmaxnmq(curVec0, vecLow);
+        curVec0 = vminnmq(curVec0, vecHigh);
+        vstrwq_p(pDst, curVec0, p0);
+    }
+}
+
+#else
+void arm_clip_f32(const float32_t * pSrc, 
+  float32_t * pDst, 
+  float32_t low, 
+  float32_t high, 
+  uint32_t numSamples)
+{
+    uint32_t i;
+    for (i = 0; i < numSamples; i++)
+    {                                        
+        if (pSrc[i] > high)                  
+            pDst[i] = high;                  
+        else if (pSrc[i] < low)              
+            pDst[i] = low;                   
+        else                                 
+            pDst[i] = pSrc[i];               
+    }
+}
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+
+/**
+  @} end of BasicClip group
+ */