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Diffstat (limited to 'DSP_Lib/Source/SupportFunctions/arm_q31_to_q15.c')
| -rw-r--r-- | DSP_Lib/Source/SupportFunctions/arm_q31_to_q15.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/DSP_Lib/Source/SupportFunctions/arm_q31_to_q15.c b/DSP_Lib/Source/SupportFunctions/arm_q31_to_q15.c deleted file mode 100644 index 33222bc..0000000 --- a/DSP_Lib/Source/SupportFunctions/arm_q31_to_q15.c +++ /dev/null @@ -1,145 +0,0 @@ -/* ---------------------------------------------------------------------------- -* Copyright (C) 2010-2014 ARM Limited. All rights reserved. -* -* $Date: 19. March 2015 -* $Revision: V.1.4.5 -* -* Project: CMSIS DSP Library -* Title: arm_q31_to_q15.c -* -* Description: Converts the elements of the Q31 vector to Q15 vector. -* -* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 -* -* Redistribution and use in source and binary forms, with or without -* modification, are permitted provided that the following conditions -* are met: -* - Redistributions of source code must retain the above copyright -* notice, this list of conditions and the following disclaimer. -* - Redistributions in binary form must reproduce the above copyright -* notice, this list of conditions and the following disclaimer in -* the documentation and/or other materials provided with the -* distribution. -* - Neither the name of ARM LIMITED nor the names of its contributors -* may be used to endorse or promote products derived from this -* software without specific prior written permission. -* -* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -* POSSIBILITY OF SUCH DAMAGE. -* ---------------------------------------------------------------------------- */ - -#include "arm_math.h" - -/** - * @ingroup groupSupport - */ - -/** - * @addtogroup q31_to_x - * @{ - */ - -/** - * @brief Converts the elements of the Q31 vector to Q15 vector. - * @param[in] *pSrc points to the Q31 input vector - * @param[out] *pDst points to the Q15 output vector - * @param[in] blockSize length of the input vector - * @return none. - * - * \par Description: - * - * The equation used for the conversion process is: - * - * <pre> - * pDst[n] = (q15_t) pSrc[n] >> 16; 0 <= n < blockSize. - * </pre> - * - */ - - -void arm_q31_to_q15( - q31_t * pSrc, - q15_t * pDst, - uint32_t blockSize) -{ - q31_t *pIn = pSrc; /* Src pointer */ - uint32_t blkCnt; /* loop counter */ - -#ifndef ARM_MATH_CM0_FAMILY - - /* Run the below code for Cortex-M4 and Cortex-M3 */ - q31_t in1, in2, in3, in4; - q31_t out1, out2; - - /*loop Unrolling */ - 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 = (q15_t) A >> 16 */ - /* convert from q31 to q15 and then store the results in the destination buffer */ - in1 = *pIn++; - in2 = *pIn++; - in3 = *pIn++; - in4 = *pIn++; - - /* pack two higher 16-bit values from two 32-bit values */ -#ifndef ARM_MATH_BIG_ENDIAN - - out1 = __PKHTB(in2, in1, 16); - out2 = __PKHTB(in4, in3, 16); - -#else - - out1 = __PKHTB(in1, in2, 16); - out2 = __PKHTB(in3, in4, 16); - -#endif // #ifdef ARM_MATH_BIG_ENDIAN - - *__SIMD32(pDst)++ = out1; - *__SIMD32(pDst)++ = out2; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* If the blockSize is not a multiple of 4, compute any remaining output samples here. - ** No loop unrolling is used. */ - blkCnt = blockSize % 0x4u; - -#else - - /* Run the below code for Cortex-M0 */ - - /* Loop over blockSize number of values */ - blkCnt = blockSize; - -#endif /* #ifndef ARM_MATH_CM0_FAMILY */ - - while(blkCnt > 0u) - { - /* C = (q15_t) A >> 16 */ - /* convert from q31 to q15 and then store the results in the destination buffer */ - *pDst++ = (q15_t) (*pIn++ >> 16); - - /* Decrement the loop counter */ - blkCnt--; - } - -} - -/** - * @} end of q31_to_x group - */ |