arm_copy_f32.c 3.0 KB

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  1. /* ----------------------------------------------------------------------
  2. * Project: CMSIS DSP Library
  3. * Title: arm_copy_f32.c
  4. * Description: Copies the elements of a floating-point vector
  5. *
  6. * $Date: 27. January 2017
  7. * $Revision: V.1.5.1
  8. *
  9. * Target Processor: Cortex-M cores
  10. * -------------------------------------------------------------------- */
  11. /*
  12. * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
  13. *
  14. * SPDX-License-Identifier: Apache-2.0
  15. *
  16. * Licensed under the Apache License, Version 2.0 (the License); you may
  17. * not use this file except in compliance with the License.
  18. * You may obtain a copy of the License at
  19. *
  20. * www.apache.org/licenses/LICENSE-2.0
  21. *
  22. * Unless required by applicable law or agreed to in writing, software
  23. * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  24. * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  25. * See the License for the specific language governing permissions and
  26. * limitations under the License.
  27. */
  28. #include "arm_math.h"
  29. /**
  30. * @ingroup groupSupport
  31. */
  32. /**
  33. * @defgroup copy Vector Copy
  34. *
  35. * Copies sample by sample from source vector to destination vector.
  36. *
  37. * <pre>
  38. * pDst[n] = pSrc[n]; 0 <= n < blockSize.
  39. * </pre>
  40. *
  41. * There are separate functions for floating point, Q31, Q15, and Q7 data types.
  42. */
  43. /**
  44. * @addtogroup copy
  45. * @{
  46. */
  47. /**
  48. * @brief Copies the elements of a floating-point vector.
  49. * @param[in] *pSrc points to input vector
  50. * @param[out] *pDst points to output vector
  51. * @param[in] blockSize length of the input vector
  52. * @return none.
  53. *
  54. */
  55. void arm_copy_f32(
  56. float32_t * pSrc,
  57. float32_t * pDst,
  58. uint32_t blockSize)
  59. {
  60. uint32_t blkCnt; /* loop counter */
  61. #if defined (ARM_MATH_DSP)
  62. /* Run the below code for Cortex-M4 and Cortex-M3 */
  63. float32_t in1, in2, in3, in4;
  64. /*loop Unrolling */
  65. blkCnt = blockSize >> 2U;
  66. /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
  67. ** a second loop below computes the remaining 1 to 3 samples. */
  68. while (blkCnt > 0U)
  69. {
  70. /* C = A */
  71. /* Copy and then store the results in the destination buffer */
  72. in1 = *pSrc++;
  73. in2 = *pSrc++;
  74. in3 = *pSrc++;
  75. in4 = *pSrc++;
  76. *pDst++ = in1;
  77. *pDst++ = in2;
  78. *pDst++ = in3;
  79. *pDst++ = in4;
  80. /* Decrement the loop counter */
  81. blkCnt--;
  82. }
  83. /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  84. ** No loop unrolling is used. */
  85. blkCnt = blockSize % 0x4U;
  86. #else
  87. /* Run the below code for Cortex-M0 */
  88. /* Loop over blockSize number of values */
  89. blkCnt = blockSize;
  90. #endif /* #if defined (ARM_MATH_DSP) */
  91. while (blkCnt > 0U)
  92. {
  93. /* C = A */
  94. /* Copy and then store the results in the destination buffer */
  95. *pDst++ = *pSrc++;
  96. /* Decrement the loop counter */
  97. blkCnt--;
  98. }
  99. }
  100. /**
  101. * @} end of BasicCopy group
  102. */