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FFmpeg/libavcodec/mips/cabac.h
Jiaxun Yang 2323d3a923 avcodec/mips: cabac.h provide fallback for wsbh instruction 
wsbh is only avilable for MIPS R2+.
Provide a fallback for older processors.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Shiyou Yin <yinshiyou-hf@loongson.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2021-07-28 23:31:48 +02:00

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/*
* Loongson SIMD optimized h264chroma
*
* Copyright (c) 2018 Loongson Technology Corporation Limited
* Contributed by Shiyou Yin <yinshiyou-hf@loongson.cn>
* Gu Xiwei(guxiwei-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 "libavutil/attributes.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_mips(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_SLL "%[tmp0], %[tmp0], 0x01 \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"
"slt %[tmp2], %[tmp0], %[c_low] \n\t"
"beqz %[tmp2], 1f \n\t"
"move %[c_range], %[tmp1] \n\t"
"not %[bit], %[bit] \n\t"
PTR_SUBU "%[c_low], %[c_low], %[tmp0] \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 %[tmp1], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp1], 1f \n\t"
PTR_ADDIU "%[tmp0], %[c_low], -0X01 \n\t"
"xor %[tmp0], %[c_low], %[tmp0] \n\t"
PTR_SRA "%[tmp0], %[tmp0], 0x0f \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
/* tmp2: ff_h264_norm_shift[x >> (CABAC_BITS - 1)] */
"lbu %[tmp2], %[norm_off](%[tmp0]) \n\t"
#if HAVE_BIGENDIAN
"lhu %[tmp0], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp0], 0(%[c_bytestream]) \n\t"
#if HAVE_MIPS32R2 || HAVE_MIPS64R2
"wsbh %[tmp0], %[tmp0] \n\t"
#else
"and %[tmp1], %[tmp0], 0xff00ff00 \n\t"
"srl %[tmp1], %[tmp1], 8 \n\t"
"and %[tmp0], %[tmp0], 0x00ff00ff \n\t"
"sll %[tmp0], %[tmp0], 8 \n\t"
"or %[tmp0], %[tmp0], %[tmp1] \n\t"
#endif
#endif
PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
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
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0x02 \n\t"
#else
"slt %[tmp0], %[c_bytestream], %[c_bytestream_end] \n\t"
PTR_ADDIU "%[tmp2], %[c_bytestream], 0x02 \n\t"
"movn %[c_bytestream], %[tmp2], %[tmp0] \n\t"
#endif
"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]"r"(CABAC_MASK)
: "memory"
);
return bit;
}
#define get_cabac_bypass get_cabac_bypass_mips
static av_always_inline int get_cabac_bypass_mips(CABACContext *c)
{
mips_reg tmp0, tmp1;
int res = 0;
__asm__ volatile(
PTR_SLL "%[c_low], %[c_low], 0x01 \n\t"
"and %[tmp0], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp0], 1f \n\t"
#if HAVE_BIGENDIAN
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#if HAVE_MIPS32R2 || HAVE_MIPS64R2
"wsbh %[tmp1], %[tmp1] \n\t"
#else
"and %[tmp0], %[tmp1], 0xff00ff00 \n\t"
"srl %[tmp0], %[tmp0], 8 \n\t"
"and %[tmp1], %[tmp1], 0x00ff00ff \n\t"
"sll %[tmp1], %[tmp1], 8 \n\t"
"or %[tmp1], %[tmp1], %[tmp0] \n\t"
#endif
#endif
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[cabac_mask] \n\t"
PTR_ADDU "%[c_low], %[c_low], %[tmp1] \n\t"
#if UNCHECKED_BITSTREAM_READER
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0x02 \n\t"
#else
"slt %[tmp0], %[c_bytestream], %[c_bytestream_end] \n\t"
PTR_ADDIU "%[tmp1], %[c_bytestream], 0x02 \n\t"
"movn %[c_bytestream], %[tmp1], %[tmp0] \n\t"
#endif
"1: \n\t"
PTR_SLL "%[tmp1], %[c_range], 0x11 \n\t"
"slt %[tmp0], %[c_low], %[tmp1] \n\t"
PTR_SUBU "%[tmp1], %[c_low], %[tmp1] \n\t"
"movz %[res], %[one], %[tmp0] \n\t"
"movz %[c_low], %[tmp1], %[tmp0] \n\t"
: [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [res]"+&r"(res),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
[c_bytestream]"+&r"(c->bytestream)
: [cabac_mask]"r"(CABAC_MASK),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[one]"r"(0x01)
: "memory"
);
return res;
}
#define get_cabac_bypass_sign get_cabac_bypass_sign_mips
static av_always_inline int get_cabac_bypass_sign_mips(CABACContext *c, int val)
{
mips_reg tmp0, tmp1;
int res = val;
__asm__ volatile(
PTR_SLL "%[c_low], %[c_low], 0x01 \n\t"
"and %[tmp0], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp0], 1f \n\t"
#if HAVE_BIGENDIAN
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#if HAVE_MIPS32R2 || HAVE_MIPS64R2
"wsbh %[tmp1], %[tmp1] \n\t"
#else
"and %[tmp0], %[tmp1], 0xff00ff00 \n\t"
"srl %[tmp0], %[tmp0], 8 \n\t"
"and %[tmp1], %[tmp1], 0x00ff00ff \n\t"
"sll %[tmp1], %[tmp1], 8 \n\t"
"or %[tmp1], %[tmp1], %[tmp0] \n\t"
#endif
#endif
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[cabac_mask] \n\t"
PTR_ADDU "%[c_low], %[c_low], %[tmp1] \n\t"
#if UNCHECKED_BITSTREAM_READER
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0x02 \n\t"
#else
"slt %[tmp0], %[c_bytestream], %[c_bytestream_end] \n\t"
PTR_ADDIU "%[tmp1], %[c_bytestream], 0x02 \n\t"
"movn %[c_bytestream], %[tmp1], %[tmp0] \n\t"
#endif
"1: \n\t"
PTR_SLL "%[tmp1], %[c_range], 0x11 \n\t"
"slt %[tmp0], %[c_low], %[tmp1] \n\t"
PTR_SUBU "%[tmp1], %[c_low], %[tmp1] \n\t"
"movz %[c_low], %[tmp1], %[tmp0] \n\t"
PTR_SUBU "%[tmp1], %[zero], %[res] \n\t"
"movn %[res], %[tmp1], %[tmp0] \n\t"
: [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [res]"+&r"(res),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
[c_bytestream]"+&r"(c->bytestream)
: [cabac_mask]"r"(CABAC_MASK),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[zero]"r"(0x0)
: "memory"
);
return res;
}
#endif /* AVCODEC_MIPS_CABAC_H */
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