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| /* | |
| * Loongson optimized cabac | |
| * | |
| * Copyright (c) 2021 Loongson Technology Corporation Limited | |
| * Contributed by Hao Chen <chenhao@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 | |
| */ | |
| static int decode_significance_loongarch(CABACContext *c, int max_coeff, | |
| uint8_t *significant_coeff_ctx_base, int *index, int64_t last_off) | |
| { | |
| void *end = significant_coeff_ctx_base + max_coeff - 1; | |
| int64_t minusstart = -(int64_t)significant_coeff_ctx_base; | |
| int64_t minusindex = 4 - (int64_t)index; | |
| int64_t bit, tmp0, tmp1, tmp2, one = 1; | |
| uint8_t *state = significant_coeff_ctx_base; | |
| __asm__ volatile( | |
| "3:" | |
| #if UNCHECKED_BITSTREAM_READER | |
| GET_CABAC_LOONGARCH_UNCBSR | |
| #else | |
| GET_CABAC_LOONGARCH | |
| #endif | |
| "blt %[bit], %[one], 4f \n\t" | |
| "add.d %[state], %[state], %[last_off] \n\t" | |
| #if UNCHECKED_BITSTREAM_READER | |
| GET_CABAC_LOONGARCH_UNCBSR | |
| #else | |
| GET_CABAC_LOONGARCH | |
| #endif | |
| "sub.d %[state], %[state], %[last_off] \n\t" | |
| "add.d %[tmp0], %[state], %[minusstart] \n\t" | |
| "st.w %[tmp0], %[index], 0 \n\t" | |
| "bge %[bit], %[one], 5f \n\t" | |
| "addi.d %[index], %[index], 4 \n\t" | |
| "4: \n\t" | |
| "addi.d %[state], %[state], 1 \n\t" | |
| "blt %[state], %[end], 3b \n\t" | |
| "add.d %[tmp0], %[state], %[minusstart] \n\t" | |
| "st.w %[tmp0], %[index], 0 \n\t" | |
| "5: \n\t" | |
| "add.d %[tmp0], %[index], %[minusindex] \n\t" | |
| "srli.d %[tmp0], %[tmp0], 2 \n\t" | |
| : [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [tmp2]"=&r"(tmp2), | |
| [c_range]"+&r"(c->range), [c_low]"+&r"(c->low), [state]"+&r"(state), | |
| [c_bytestream]"+&r"(c->bytestream), [index]"+&r"(index) | |
| : [tables]"r"(ff_h264_cabac_tables), [end]"r"(end), [one]"r"(one), | |
| [minusstart]"r"(minusstart), [minusindex]"r"(minusindex), | |
| [last_off]"r"(last_off), | |
| #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 (int)tmp0; | |
| } | |
| static int decode_significance_8x8_loongarch( | |
| CABACContext *c, uint8_t *significant_coeff_ctx_base, | |
| int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off) | |
| { | |
| int64_t minusindex = 4 - (int64_t)index; | |
| int64_t bit, tmp0, tmp1, tmp2, one = 1, end = 63, last = 0; | |
| uint8_t *state = 0; | |
| int64_t flag_offset = H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET; | |
| __asm__ volatile( | |
| "3: \n\t" | |
| "ldx.bu %[tmp0], %[sig_off], %[last] \n\t" | |
| "add.d %[state], %[tmp0], %[significant_coeff_ctx_base] \n\t" | |
| #if UNCHECKED_BITSTREAM_READER | |
| GET_CABAC_LOONGARCH_UNCBSR | |
| #else | |
| GET_CABAC_LOONGARCH | |
| #endif | |
| "blt %[bit], %[one], 4f \n\t" | |
| "add.d %[tmp0], %[tables], %[flag_offset] \n\t" | |
| "ldx.bu %[tmp1], %[tmp0], %[last] \n\t" | |
| "add.d %[state], %[tmp1], %[last_coeff_ctx_base] \n\t" | |
| #if UNCHECKED_BITSTREAM_READER | |
| GET_CABAC_LOONGARCH_UNCBSR | |
| #else | |
| GET_CABAC_LOONGARCH | |
| #endif | |
| "st.w %[last], %[index], 0 \n\t" | |
| "bge %[bit], %[one], 5f \n\t" | |
| "addi.d %[index], %[index], 4 \n\t" | |
| "4: \n\t" | |
| "addi.d %[last], %[last], 1 \n\t" | |
| "blt %[last], %[end], 3b \n\t" | |
| "st.w %[last], %[index], 0 \n\t" | |
| "5: \n\t" | |
| "add.d %[tmp0], %[index], %[minusindex] \n\t" | |
| "srli.d %[tmp0], %[tmp0], 2 \n\t" | |
| : [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), | |
| [tmp2]"=&r"(tmp2), [c_range]"+&r"(c->range), | |
| [c_low]"+&r"(c->low), [state]"+&r"(state), [last]"+&r"(last), | |
| [c_bytestream]"+&r"(c->bytestream), [index]"+&r"(index) | |
| : [tables]"r"(ff_h264_cabac_tables), [end]"r"(end), | |
| [one]"r"(one), [minusindex]"r"(minusindex), | |
| [last_coeff_ctx_base]"r"(last_coeff_ctx_base), | |
| [flag_offset]"r"(flag_offset), | |
| #if !UNCHECKED_BITSTREAM_READER | |
| [c_bytestream_end]"r"(c->bytestream_end), | |
| #endif | |
| [lps_off]"i"(H264_LPS_RANGE_OFFSET), [sig_off]"r"(sig_off), | |
| [mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128), | |
| [norm_off]"i"(H264_NORM_SHIFT_OFFSET), | |
| [cabac_mask]"r"(CABAC_MASK), | |
| [significant_coeff_ctx_base]"r"(significant_coeff_ctx_base) | |
| ); | |
| return (int)tmp0; | |
| } | |