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04d092e7d5
RV64G supports MIN & MAX instructions natively only on floating point registers, not general purpose ones. The later would require the Zbb extension. Due to that, it is actually faster to perform the clipping "properly" in FPU. Benchmarks on SiFive U74-MC (courtesy of Shanghai StarFive Tech): audiodsp.vector_clipf_c: 29551.5 audiodsp.vector_clipf_rvf: 17871.0 Also tried unrolling with 2 or 8 elements but it gets worse either way.
62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_AUDIODSP_H
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#define AVCODEC_AUDIODSP_H
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#include <stdint.h>
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typedef struct AudioDSPContext {
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/**
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* Calculate scalar product of two vectors.
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* @param len length of vectors, should be multiple of 16
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*/
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int32_t (*scalarproduct_int16)(const int16_t *v1,
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const int16_t *v2 /* align 16 */, int len);
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/**
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* Clip each element in an array of int32_t to a given minimum and
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* maximum value.
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* @param dst destination array
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* constraints: 16-byte aligned
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* @param src source array
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* constraints: 16-byte aligned
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* @param min minimum value
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* constraints: must be in the range [-(1 << 24), 1 << 24]
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* @param max maximum value
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* constraints: must be in the range [-(1 << 24), 1 << 24]
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* @param len number of elements in the array
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* constraints: multiple of 32 greater than zero
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*/
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void (*vector_clip_int32)(int32_t *dst, const int32_t *src, int32_t min,
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int32_t max, unsigned int len);
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/* assume len is a multiple of 16, and arrays are 16-byte aligned */
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void (*vector_clipf)(float *dst /* align 16 */,
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const float *src /* align 16 */,
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int len /* align 16 */,
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float min, float max);
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} AudioDSPContext;
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void ff_audiodsp_init(AudioDSPContext *c);
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void ff_audiodsp_init_arm(AudioDSPContext *c);
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void ff_audiodsp_init_ppc(AudioDSPContext *c);
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void ff_audiodsp_init_riscv(AudioDSPContext *c);
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void ff_audiodsp_init_x86(AudioDSPContext *c);
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#endif /* AVCODEC_AUDIODSP_H */
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