mirror of https://github.com/FFmpeg/FFmpeg.git
* commit 'dfe224f377be3e45758c69d881ca7874b82d647a': aarch64: get_cabac inline asm Merged-by: Michael Niedermayer <michaelni@gmx.at>pull/293/head
Michael Niedermayer
11 years ago
commit
cbee7ff0b7
3 changed files with 108 additions and 1 deletions
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/*
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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_AARCH64_CABAC_H |
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#define AVCODEC_AARCH64_CABAC_H |
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#include "config.h" |
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#if HAVE_INLINE_ASM |
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#include "libavutil/attributes.h" |
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#include "libavutil/internal.h" |
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#include "libavcodec/cabac.h" |
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#define get_cabac_inline get_cabac_inline_aarch64 |
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static av_always_inline int get_cabac_inline_aarch64(CABACContext *c, |
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uint8_t *const state) |
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{ |
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int bit; |
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void *reg_a, *reg_b, *reg_c, *tmp; |
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__asm__ volatile( |
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"ldrb %w[bit] , [%[state]] \n\t" |
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"add %[r_b] , %[tables] , %[lps_off] \n\t" |
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"mov %w[tmp] , %w[range] \n\t" |
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"and %w[range] , %w[range] , #0xC0 \n\t" |
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"lsl %w[r_c] , %w[range] , #1 \n\t" |
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"add %[r_b] , %[r_b] , %w[bit], UXTW \n\t" |
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"ldrb %w[range] , [%[r_b], %w[r_c], SXTW] \n\t" |
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"sub %w[r_c] , %w[tmp] , %w[range] \n\t" |
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"lsl %w[tmp] , %w[r_c] , #17 \n\t" |
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"cmp %w[tmp] , %w[low] \n\t" |
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"csel %w[tmp] , %w[tmp] , wzr , cc \n\t" |
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"csel %w[range] , %w[r_c] , %w[range], gt \n\t" |
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"cinv %w[bit] , %w[bit] , cc \n\t" |
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"sub %w[low] , %w[low] , %w[tmp] \n\t" |
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"add %[r_b] , %[tables] , %[norm_off] \n\t" |
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"add %[r_a] , %[tables] , %[mlps_off] \n\t" |
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"ldrb %w[tmp] , [%[r_b], %w[range], SXTW] \n\t" |
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"ldrb %w[r_a] , [%[r_a], %w[bit], SXTW] \n\t" |
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"lsl %w[low] , %w[low] , %w[tmp] \n\t" |
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"lsl %w[range] , %w[range] , %w[tmp] \n\t" |
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"uxth %w[r_c] , %w[low] \n\t" |
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"strb %w[r_a] , [%[state]] \n\t" |
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"cbnz %w[r_c] , 2f \n\t" |
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"ldr %[r_c] , [%[c], %[byte]] \n\t" |
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"ldr %[r_a] , [%[c], %[end]] \n\t" |
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"ldrh %w[tmp] , [%[r_c]] \n\t" |
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"cmp %[r_c] , %[r_a] \n\t" |
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"b.ge 1f \n\t" |
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"add %[r_a] , %[r_c] , #2 \n\t" |
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"str %[r_a] , [%[c], %[byte]] \n\t" |
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"1: \n\t" |
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"sub %w[r_c] , %w[low] , #1 \n\t" |
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"eor %w[r_c] , %w[r_c] , %w[low] \n\t" |
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"rev %w[tmp] , %w[tmp] \n\t" |
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"lsr %w[r_c] , %w[r_c] , #15 \n\t" |
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"lsr %w[tmp] , %w[tmp] , #15 \n\t" |
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"ldrb %w[r_c] , [%[r_b], %w[r_c], SXTW] \n\t" |
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"mov %w[r_b] , #0xFFFF \n\t" |
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"mov %w[r_a] , #7 \n\t" |
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"sub %w[tmp] , %w[tmp] , %w[r_b] \n\t" |
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"sub %w[r_c] , %w[r_a] , %w[r_c] \n\t" |
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"lsl %w[tmp] , %w[tmp] , %w[r_c] \n\t" |
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"add %w[low] , %w[low] , %w[tmp] \n\t" |
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"2: \n\t" |
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: [bit]"=&r"(bit), |
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[low]"+&r"(c->low), |
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[range]"+&r"(c->range), |
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[r_a]"=&r"(reg_a), |
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[r_b]"=&r"(reg_b), |
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[r_c]"=&r"(reg_c), |
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[tmp]"=&r"(tmp) |
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: [c]"r"(c), |
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[state]"r"(state), |
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[tables]"r"(ff_h264_cabac_tables), |
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[byte]"i"(offsetof(CABACContext, bytestream)), |
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[end]"i"(offsetof(CABACContext, bytestream_end)), |
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[norm_off]"I"(H264_NORM_SHIFT_OFFSET), |
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[lps_off]"I"(H264_LPS_RANGE_OFFSET), |
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[mlps_off]"I"(H264_MLPS_STATE_OFFSET + 128) |
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: "memory", "cc" |
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); |
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return bit & 1; |
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} |
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#endif /* HAVE_INLINE_ASM */ |
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#endif /* AVCODEC_AARCH64_CABAC_H */ |
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