2 * Loongson SIMD optimized h264chroma
4 * Copyright (c) 2018 Loongson Technology Corporation Limited
5 * Copyright (c) 2018 Shiyou Yin <yinshiyou-hf@loongson.cn>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #ifndef AVCODEC_MIPS_CABAC_H
25 #define AVCODEC_MIPS_CABAC_H
27 #include "libavutil/attributes.h"
28 #include "libavcodec/cabac.h"
29 #include "libavutil/mips/asmdefs.h"
32 #define get_cabac_inline get_cabac_inline_mips
33 static av_always_inline int get_cabac_inline_mips(CABACContext *c,
34 uint8_t * const state){
35 mips_reg tmp0, tmp1, tmp2, bit;
38 "lbu %[bit], 0(%[state]) \n\t"
39 "and %[tmp0], %[c_range], 0xC0 \n\t"
40 PTR_ADDU "%[tmp0], %[tmp0], %[tmp0] \n\t"
41 PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
42 PTR_ADDU "%[tmp0], %[tmp0], %[bit] \n\t"
44 "lbu %[tmp1], %[lps_off](%[tmp0]) \n\t"
46 PTR_SUBU "%[c_range], %[c_range], %[tmp1] \n\t"
47 PTR_SLL "%[tmp0], %[c_range], 0x11 \n\t"
48 PTR_SUBU "%[tmp0], %[tmp0], %[c_low] \n\t"
51 PTR_SRA "%[tmp2], %[tmp0], 0x1F \n\t"
52 /* If tmp0 < 0, lps_mask == 0xffffffff*/
53 /* If tmp0 >= 0, lps_mask == 0x00000000*/
54 "beqz %[tmp2], 1f \n\t"
55 PTR_SLL "%[tmp0], %[c_range], 0x11 \n\t"
56 PTR_SUBU "%[c_low], %[c_low], %[tmp0] \n\t"
57 PTR_SUBU "%[tmp0], %[tmp1], %[c_range] \n\t"
58 PTR_ADDU "%[c_range], %[c_range], %[tmp0] \n\t"
59 "xor %[bit], %[bit], %[tmp2] \n\t"
63 PTR_ADDU "%[tmp0], %[tables], %[bit] \n\t"
64 "lbu %[tmp1], %[mlps_off](%[tmp0]) \n\t"
66 PTR_ADDU "%[tmp0], %[tables], %[c_range] \n\t"
67 "lbu %[tmp2], %[norm_off](%[tmp0]) \n\t"
69 "sb %[tmp1], 0(%[state]) \n\t"
70 "and %[bit], %[bit], 0x01 \n\t"
71 PTR_SLL "%[c_range], %[c_range], %[tmp2] \n\t"
72 PTR_SLL "%[c_low], %[c_low], %[tmp2] \n\t"
74 "and %[tmp0], %[c_low], %[cabac_mask] \n\t"
75 "bnez %[tmp0], 1f \n\t"
76 PTR_ADDIU "%[tmp0], %[c_low], -0x01 \n\t"
77 "xor %[tmp0], %[c_low], %[tmp0] \n\t"
78 PTR_SRA "%[tmp0], %[tmp0], 0x0f \n\t"
79 PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
80 "lbu %[tmp2], %[norm_off](%[tmp0]) \n\t"
82 "lbu %[tmp0], 0(%[c_bytestream]) \n\t"
83 "lbu %[tmp1], 1(%[c_bytestream]) \n\t"
84 PTR_SLL "%[tmp0], %[tmp0], 0x09 \n\t"
85 PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
86 PTR_ADDU "%[tmp0], %[tmp0], %[tmp1] \n\t"
88 "lbu %[tmp0], 0(%[c_bytestream]) \n\t"
89 PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
91 PTR_SUBU "%[tmp0], %[tmp0], %[cabac_mask] \n\t"
93 "li %[tmp1], 0x07 \n\t"
94 PTR_SUBU "%[tmp1], %[tmp1], %[tmp2] \n\t"
95 PTR_SLL "%[tmp0], %[tmp0], %[tmp1] \n\t"
96 PTR_ADDU "%[c_low], %[c_low], %[tmp0] \n\t"
98 #if !UNCHECKED_BITSTREAM_READER
99 "bge %[c_bytestream], %[c_bytestream_end], 1f \n\t"
101 PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0X02 \n\t"
103 : [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [tmp2]"=&r"(tmp2),
104 [c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
105 [c_bytestream]"+&r"(c->bytestream)
106 : [state]"r"(state), [tables]"r"(ff_h264_cabac_tables),
107 #if !UNCHECKED_BITSTREAM_READER
108 [c_bytestream_end]"r"(c->bytestream_end),
110 [lps_off]"i"(H264_LPS_RANGE_OFFSET),
111 [mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128),
112 [norm_off]"i"(H264_NORM_SHIFT_OFFSET),
113 [cabac_mask]"r"(CABAC_MASK)
120 #endif /* AVCODEC_MIPS_CABAC_H */