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  1. /*
  2.  * Copyright (C) 2010-2018 Arm Limited or its affiliates. All rights reserved.
  3.  *
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  *
  6.  * Licensed under the Apache License, Version 2.0 (the License); you may
  7.  * not use this file except in compliance with the License.
  8.  * You may obtain a copy of the License at
  9.  *
  10.  * www.apache.org/licenses/LICENSE-2.0
  11.  *
  12.  * Unless required by applicable law or agreed to in writing, software
  13.  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  14.  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15.  * See the License for the specific language governing permissions and
  16.  * limitations under the License.
  17.  */
  18.  
  19. /* ----------------------------------------------------------------------
  20.  * Project:      CMSIS NN Library
  21.  * Title:        arm_q7_to_q15_no_shift.c
  22.  * Description:  Converts the elements of the Q7 vector to Q15 vector without left-shift
  23.  *
  24.  * $Date:        17. January 2018
  25.  * $Revision:    V.1.0.0
  26.  *
  27.  * Target Processor:  Cortex-M cores
  28.  *
  29.  * -------------------------------------------------------------------- */
  30.  
  31. #include "arm_nnsupportfunctions.h"
  32.  
  33. /**    
  34.  * @ingroup groupSupport    
  35.  */
  36.  
  37. /**    
  38.  * @addtogroup nndata_convert    
  39.  * @{    
  40.  */
  41.  
  42. /**    
  43.  * @brief Converts the elements of the Q7 vector to Q15 vector without left-shift
  44.  * @param[in]       *pSrc points to the Q7 input vector    
  45.  * @param[out]      *pDst points to the Q15 output vector  
  46.  * @param[in]       blockSize length of the input vector    
  47.  * @return none.    
  48.  *    
  49.  * \par Description:    
  50.  *    
  51.  * The equation used for the conversion process is:    
  52.  *  
  53.  * <pre>    
  54.  *      pDst[n] = (q15_t) pSrc[n];   0 <= n < blockSize.    
  55.  * </pre>    
  56.  *  
  57.  */
  58.  
  59. void arm_q7_to_q15_no_shift(const q7_t * pSrc, q15_t * pDst, uint32_t blockSize)
  60. {
  61.     const q7_t *pIn = pSrc;     /* Src pointer */
  62.     uint32_t  blkCnt;           /* loop counter */
  63.  
  64. #ifndef ARM_MATH_CM0_FAMILY
  65.     q31_t     in;
  66.     q31_t     in1, in2;
  67.     q31_t     out1, out2;
  68.  
  69.     /* Run the below code for Cortex-M4 and Cortex-M3 */
  70.  
  71.     /*loop Unrolling */
  72.     blkCnt = blockSize >> 2u;
  73.  
  74.     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
  75.      ** a second loop below computes the remaining 1 to 3 samples. */
  76.     while (blkCnt > 0u)
  77.     {
  78.         /* C = (q15_t) A << 8 */
  79.         /* convert from q7 to q15 and then store the results in the destination buffer */
  80.         in = *__SIMD32(pIn)++;
  81.  
  82.         /* rotatate in by 8 and extend two q7_t values to q15_t values */
  83.         in1 = __SXTB16(__ROR(in, 8));
  84.  
  85.         /* extend remainig two q7_t values to q15_t values */
  86.         in2 = __SXTB16(in);
  87.  
  88. #ifndef ARM_MATH_BIG_ENDIAN
  89.  
  90.         out2 = __PKHTB(in1, in2, 16);
  91.         out1 = __PKHBT(in2, in1, 16);
  92.  
  93. #else
  94.  
  95.         out1 = __PKHTB(in1, in2, 16);
  96.         out2 = __PKHBT(in2, in1, 16);
  97.  
  98. #endif
  99.  
  100.         *__SIMD32(pDst)++ = out1;
  101.         *__SIMD32(pDst)++ = out2;
  102.  
  103.         /* Decrement the loop counter */
  104.         blkCnt--;
  105.     }
  106.  
  107.     /* If the blockSize is not a multiple of 4, compute any remaining output samples here.    
  108.      ** No loop unrolling is used. */
  109.     blkCnt = blockSize % 0x4u;
  110.  
  111. #else
  112.  
  113.     /* Run the below code for Cortex-M0 */
  114.  
  115.     /* Loop over blockSize number of values */
  116.     blkCnt = blockSize;
  117.  
  118. #endif                          /* #ifndef ARM_MATH_CM0_FAMILY */
  119.  
  120.     while (blkCnt > 0u)
  121.     {
  122.         /* C = (q15_t) A << 8 */
  123.         /* convert from q7 to q15 and then store the results in the destination buffer */
  124.         *pDst++ = (q15_t) * pIn++;
  125.  
  126.         /* Decrement the loop counter */
  127.         blkCnt--;
  128.     }
  129.  
  130. }
  131.  
  132. /**    
  133.  * @} end of nndata_convert group  
  134.  */
  135.