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ffmpeg/libavcodec/mips/cabac.h

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avcodec: [loongson] optimize get_cabac_inline. This optimization improved h264 decoding performance about 4%(from 74fps to 77fps, tested on loongson 3A3000). Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2018-09-18 02:59:41 +00:00
/*
* Loongson SIMD optimized h264chroma
*
* Copyright (c) 2018 Loongson Technology Corporation Limited
* Copyright (c) 2018 Shiyou Yin <yinshiyou-hf@loongson.cn>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_MIPS_CABAC_H
#define AVCODEC_MIPS_CABAC_H
#include "libavcodec/cabac.h"
#include "libavutil/mips/mmiutils.h"
#include "config.h"
#define get_cabac_inline get_cabac_inline_mips
static av_always_inline int get_cabac_inline(CABACContext *c,
uint8_t * const state){
mips_reg tmp0, tmp1, tmp2, bit;
__asm__ volatile (
"lbu %[bit], 0(%[state]) \n\t"
"and %[tmp0], %[c_range], 0xC0 \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tmp0] \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[bit] \n\t"
/* tmp1: RangeLPS */
"lbu %[tmp1], %[lps_off](%[tmp0]) \n\t"
PTR_SUBU "%[c_range], %[c_range], %[tmp1] \n\t"
PTR_SLL "%[tmp0], %[c_range], 0x11 \n\t"
PTR_SUBU "%[tmp0], %[tmp0], %[c_low] \n\t"
/* tmp2: lps_mask */
PTR_SRA "%[tmp2], %[tmp0], 0x1F \n\t"
/* If tmp0 < 0, lps_mask == 0xffffffff*/
/* If tmp0 >= 0, lps_mask == 0x00000000*/
"beqz %[tmp2], 1f \n\t"
PTR_SLL "%[tmp0], %[c_range], 0x11 \n\t"
PTR_SUBU "%[c_low], %[c_low], %[tmp0] \n\t"
PTR_SUBU "%[tmp0], %[tmp1], %[c_range] \n\t"
PTR_ADDU "%[c_range], %[c_range], %[tmp0] \n\t"
"xor %[bit], %[bit], %[tmp2] \n\t"
"1: \n\t"
/* tmp1: *state */
PTR_ADDU "%[tmp0], %[tables], %[bit] \n\t"
"lbu %[tmp1], %[mlps_off](%[tmp0]) \n\t"
/* tmp2: lps_mask */
PTR_ADDU "%[tmp0], %[tables], %[c_range] \n\t"
"lbu %[tmp2], %[norm_off](%[tmp0]) \n\t"
"sb %[tmp1], 0(%[state]) \n\t"
"and %[bit], %[bit], 0x01 \n\t"
PTR_SLL "%[c_range], %[c_range], %[tmp2] \n\t"
PTR_SLL "%[c_low], %[c_low], %[tmp2] \n\t"
"and %[tmp0], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp0], 1f \n\t"
avcodec/mips/cabac: replace addi with addiu addi/daddi are deprecated by MIPS for years, and MIPS r6 remove them. They should be replace with addiu: ADDIU performs the same arithmetic operation but does not trap on overflow. Reviewed-by: Shiyou Yin <yinshiyou-hf@loongson.cn> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-07-02 03:52:43 +00:00
PTR_ADDIU "%[tmp0], %[c_low], -0x01 \n\t"
avcodec: [loongson] optimize get_cabac_inline. This optimization improved h264 decoding performance about 4%(from 74fps to 77fps, tested on loongson 3A3000). Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2018-09-18 02:59:41 +00:00
"xor %[tmp0], %[c_low], %[tmp0] \n\t"
PTR_SRA "%[tmp0], %[tmp0], 0x0f \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
"lbu %[tmp2], %[norm_off](%[tmp0]) \n\t"
#if CABAC_BITS == 16
"lbu %[tmp0], 0(%[c_bytestream]) \n\t"
"lbu %[tmp1], 1(%[c_bytestream]) \n\t"
PTR_SLL "%[tmp0], %[tmp0], 0x09 \n\t"
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tmp1] \n\t"
#else
"lbu %[tmp0], 0(%[c_bytestream]) \n\t"
PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
#endif
PTR_SUBU "%[tmp0], %[tmp0], %[cabac_mask] \n\t"
"li %[tmp1], 0x07 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[tmp2] \n\t"
PTR_SLL "%[tmp0], %[tmp0], %[tmp1] \n\t"
PTR_ADDU "%[c_low], %[c_low], %[tmp0] \n\t"
#if !UNCHECKED_BITSTREAM_READER
"bge %[c_bytestream], %[c_bytestream_end], 1f \n\t"
#endif
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0X02 \n\t"
"1: \n\t"
: [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [tmp2]"=&r"(tmp2),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
[c_bytestream]"+&r"(c->bytestream)
: [state]"r"(state), [tables]"r"(ff_h264_cabac_tables),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[lps_off]"i"(H264_LPS_RANGE_OFFSET),
[mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128),
[norm_off]"i"(H264_NORM_SHIFT_OFFSET),
[cabac_mask]"i"(CABAC_MASK)
: "memory"
);
return bit;
}
#endif /* AVCODEC_MIPS_CABAC_H */