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Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FilteringFunctions/arm_conv_opt_q7.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FilteringFunctions/arm_conv_opt_q7.c | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FilteringFunctions/arm_conv_opt_q7.c b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FilteringFunctions/arm_conv_opt_q7.c new file mode 100644 index 0000000000..e3dc97ea78 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FilteringFunctions/arm_conv_opt_q7.c @@ -0,0 +1,435 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2013 ARM Limited. All rights reserved. +* +* $Date: 17. January 2013 +* $Revision: V1.4.1 +* +* Project: CMSIS DSP Library +* Title: arm_conv_opt_q7.c +* +* Description: Convolution of Q7 sequences. +* +* 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 groupFilters + */ + +/** + * @addtogroup Conv + * @{ + */ + +/** + * @brief Convolution of Q7 sequences. + * @param[in] *pSrcA points to the first input sequence. + * @param[in] srcALen length of the first input sequence. + * @param[in] *pSrcB points to the second input sequence. + * @param[in] srcBLen length of the second input sequence. + * @param[out] *pDst points to the location where the output result is written. Length srcALen+srcBLen-1. + * @param[in] *pScratch1 points to scratch buffer(of type q15_t) of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2. + * @param[in] *pScratch2 points to scratch buffer (of type q15_t) of size min(srcALen, srcBLen). + * @return none. + * + * \par Restrictions + * If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE + * In this case input, output, scratch1 and scratch2 buffers should be aligned by 32-bit + * + * @details + * <b>Scaling and Overflow Behavior:</b> + * + * \par + * The function is implemented using a 32-bit internal accumulator. + * Both the inputs are represented in 1.7 format and multiplications yield a 2.14 result. + * The 2.14 intermediate results are accumulated in a 32-bit accumulator in 18.14 format. + * This approach provides 17 guard bits and there is no risk of overflow as long as <code>max(srcALen, srcBLen)<131072</code>. + * The 18.14 result is then truncated to 18.7 format by discarding the low 7 bits and then saturated to 1.7 format. + * + */ + +void arm_conv_opt_q7( + q7_t * pSrcA, + uint32_t srcALen, + q7_t * pSrcB, + uint32_t srcBLen, + q7_t * pDst, + q15_t * pScratch1, + q15_t * pScratch2) +{ + + q15_t *pScr2, *pScr1; /* Intermediate pointers for scratch pointers */ + q15_t x4; /* Temporary input variable */ + q7_t *pIn1, *pIn2; /* inputA and inputB pointer */ + uint32_t j, k, blkCnt, tapCnt; /* loop counter */ + q7_t *px; /* Temporary input1 pointer */ + q15_t *py; /* Temporary input2 pointer */ + q31_t acc0, acc1, acc2, acc3; /* Accumulator */ + q31_t x1, x2, x3, y1; /* Temporary input variables */ + q7_t *pOut = pDst; /* output pointer */ + q7_t out0, out1, out2, out3; /* temporary variables */ + + /* The algorithm implementation is based on the lengths of the inputs. */ + /* srcB is always made to slide across srcA. */ + /* So srcBLen is always considered as shorter or equal to srcALen */ + if(srcALen >= srcBLen) + { + /* Initialization of inputA pointer */ + pIn1 = pSrcA; + + /* Initialization of inputB pointer */ + pIn2 = pSrcB; + } + else + { + /* Initialization of inputA pointer */ + pIn1 = pSrcB; + + /* Initialization of inputB pointer */ + pIn2 = pSrcA; + + /* srcBLen is always considered as shorter or equal to srcALen */ + j = srcBLen; + srcBLen = srcALen; + srcALen = j; + } + + /* pointer to take end of scratch2 buffer */ + pScr2 = pScratch2; + + /* points to smaller length sequence */ + px = pIn2 + srcBLen - 1; + + /* Apply loop unrolling and do 4 Copies simultaneously. */ + k = srcBLen >> 2u; + + /* First part of the processing with loop unrolling copies 4 data points at a time. + ** a second loop below copies for the remaining 1 to 3 samples. */ + while(k > 0u) + { + /* copy second buffer in reversal manner */ + x4 = (q15_t) * px--; + *pScr2++ = x4; + x4 = (q15_t) * px--; + *pScr2++ = x4; + x4 = (q15_t) * px--; + *pScr2++ = x4; + x4 = (q15_t) * px--; + *pScr2++ = x4; + + /* Decrement the loop counter */ + k--; + } + + /* If the count is not a multiple of 4, copy remaining samples here. + ** No loop unrolling is used. */ + k = srcBLen % 0x4u; + + while(k > 0u) + { + /* copy second buffer in reversal manner for remaining samples */ + x4 = (q15_t) * px--; + *pScr2++ = x4; + + /* Decrement the loop counter */ + k--; + } + + /* Initialze temporary scratch pointer */ + pScr1 = pScratch1; + + /* Fill (srcBLen - 1u) zeros in scratch buffer */ + arm_fill_q15(0, pScr1, (srcBLen - 1u)); + + /* Update temporary scratch pointer */ + pScr1 += (srcBLen - 1u); + + /* Copy (srcALen) samples in scratch buffer */ + /* Apply loop unrolling and do 4 Copies simultaneously. */ + k = srcALen >> 2u; + + /* First part of the processing with loop unrolling copies 4 data points at a time. + ** a second loop below copies for the remaining 1 to 3 samples. */ + while(k > 0u) + { + /* copy second buffer in reversal manner */ + x4 = (q15_t) * pIn1++; + *pScr1++ = x4; + x4 = (q15_t) * pIn1++; + *pScr1++ = x4; + x4 = (q15_t) * pIn1++; + *pScr1++ = x4; + x4 = (q15_t) * pIn1++; + *pScr1++ = x4; + + /* Decrement the loop counter */ + k--; + } + + /* If the count is not a multiple of 4, copy remaining samples here. + ** No loop unrolling is used. */ + k = srcALen % 0x4u; + + while(k > 0u) + { + /* copy second buffer in reversal manner for remaining samples */ + x4 = (q15_t) * pIn1++; + *pScr1++ = x4; + + /* Decrement the loop counter */ + k--; + } + +#ifndef UNALIGNED_SUPPORT_DISABLE + + /* Fill (srcBLen - 1u) zeros at end of scratch buffer */ + arm_fill_q15(0, pScr1, (srcBLen - 1u)); + + /* Update pointer */ + pScr1 += (srcBLen - 1u); + +#else + + /* Apply loop unrolling and do 4 Copies simultaneously. */ + k = (srcBLen - 1u) >> 2u; + + /* First part of the processing with loop unrolling copies 4 data points at a time. + ** a second loop below copies for the remaining 1 to 3 samples. */ + while(k > 0u) + { + /* copy second buffer in reversal manner */ + *pScr1++ = 0; + *pScr1++ = 0; + *pScr1++ = 0; + *pScr1++ = 0; + + /* Decrement the loop counter */ + k--; + } + + /* If the count is not a multiple of 4, copy remaining samples here. + ** No loop unrolling is used. */ + k = (srcBLen - 1u) % 0x4u; + + while(k > 0u) + { + /* copy second buffer in reversal manner for remaining samples */ + *pScr1++ = 0; + + /* Decrement the loop counter */ + k--; + } + +#endif + + /* Temporary pointer for scratch2 */ + py = pScratch2; + + /* Initialization of pIn2 pointer */ + pIn2 = (q7_t *) py; + + pScr2 = py; + + /* Actual convolution process starts here */ + blkCnt = (srcALen + srcBLen - 1u) >> 2; + + while(blkCnt > 0) + { + /* Initialze temporary scratch pointer as scratch1 */ + pScr1 = pScratch1; + + /* Clear Accumlators */ + acc0 = 0; + acc1 = 0; + acc2 = 0; + acc3 = 0; + + /* Read two samples from scratch1 buffer */ + x1 = *__SIMD32(pScr1)++; + + /* Read next two samples from scratch1 buffer */ + x2 = *__SIMD32(pScr1)++; + + tapCnt = (srcBLen) >> 2u; + + while(tapCnt > 0u) + { + + /* Read four samples from smaller buffer */ + y1 = _SIMD32_OFFSET(pScr2); + + /* multiply and accumlate */ + acc0 = __SMLAD(x1, y1, acc0); + acc2 = __SMLAD(x2, y1, acc2); + + /* pack input data */ +#ifndef ARM_MATH_BIG_ENDIAN + x3 = __PKHBT(x2, x1, 0); +#else + x3 = __PKHBT(x1, x2, 0); +#endif + + /* multiply and accumlate */ + acc1 = __SMLADX(x3, y1, acc1); + + /* Read next two samples from scratch1 buffer */ + x1 = *__SIMD32(pScr1)++; + + /* pack input data */ +#ifndef ARM_MATH_BIG_ENDIAN + x3 = __PKHBT(x1, x2, 0); +#else + x3 = __PKHBT(x2, x1, 0); +#endif + + acc3 = __SMLADX(x3, y1, acc3); + + /* Read four samples from smaller buffer */ + y1 = _SIMD32_OFFSET(pScr2 + 2u); + + acc0 = __SMLAD(x2, y1, acc0); + + acc2 = __SMLAD(x1, y1, acc2); + + acc1 = __SMLADX(x3, y1, acc1); + + x2 = *__SIMD32(pScr1)++; + +#ifndef ARM_MATH_BIG_ENDIAN + x3 = __PKHBT(x2, x1, 0); +#else + x3 = __PKHBT(x1, x2, 0); +#endif + + acc3 = __SMLADX(x3, y1, acc3); + + pScr2 += 4u; + + + /* Decrement the loop counter */ + tapCnt--; + } + + + + /* Update scratch pointer for remaining samples of smaller length sequence */ + pScr1 -= 4u; + + + /* apply same above for remaining samples of smaller length sequence */ + tapCnt = (srcBLen) & 3u; + + while(tapCnt > 0u) + { + + /* accumlate the results */ + acc0 += (*pScr1++ * *pScr2); + acc1 += (*pScr1++ * *pScr2); + acc2 += (*pScr1++ * *pScr2); + acc3 += (*pScr1++ * *pScr2++); + + pScr1 -= 3u; + + /* Decrement the loop counter */ + tapCnt--; + } + + blkCnt--; + + /* Store the result in the accumulator in the destination buffer. */ + out0 = (q7_t) (__SSAT(acc0 >> 7u, 8)); + out1 = (q7_t) (__SSAT(acc1 >> 7u, 8)); + out2 = (q7_t) (__SSAT(acc2 >> 7u, 8)); + out3 = (q7_t) (__SSAT(acc3 >> 7u, 8)); + + *__SIMD32(pOut)++ = __PACKq7(out0, out1, out2, out3); + + /* Initialization of inputB pointer */ + pScr2 = py; + + pScratch1 += 4u; + + } + + + blkCnt = (srcALen + srcBLen - 1u) & 0x3; + + /* Calculate convolution for remaining samples of Bigger length sequence */ + while(blkCnt > 0) + { + /* Initialze temporary scratch pointer as scratch1 */ + pScr1 = pScratch1; + + /* Clear Accumlators */ + acc0 = 0; + + tapCnt = (srcBLen) >> 1u; + + while(tapCnt > 0u) + { + acc0 += (*pScr1++ * *pScr2++); + acc0 += (*pScr1++ * *pScr2++); + + /* Decrement the loop counter */ + tapCnt--; + } + + tapCnt = (srcBLen) & 1u; + + /* apply same above for remaining samples of smaller length sequence */ + while(tapCnt > 0u) + { + + /* accumlate the results */ + acc0 += (*pScr1++ * *pScr2++); + + /* Decrement the loop counter */ + tapCnt--; + } + + blkCnt--; + + /* Store the result in the accumulator in the destination buffer. */ + *pOut++ = (q7_t) (__SSAT(acc0 >> 7u, 8)); + + /* Initialization of inputB pointer */ + pScr2 = py; + + pScratch1 += 1u; + + } + +} + + +/** + * @} end of Conv group + */ |