2 * Copyright (C) 2010 Mans Rullgard <mans@mansr.com>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_ARM_VP56_ARITH_H
22 #define AVCODEC_ARM_VP56_ARITH_H
24 #if HAVE_ARMV6 && HAVE_INLINE_ASM
26 #define vp56_rac_get_prob vp56_rac_get_prob_armv6
27 static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr)
29 unsigned shift = ff_vp56_norm_shift[c->high];
30 unsigned code_word = c->code_word << shift;
31 unsigned high = c->high << shift;
34 __asm__ ("adds %3, %3, %0 \n"
36 "ldrcsh %2, [%4], #2 \n"
38 "smlabb %0, %5, %6, %0 \n"
40 "orrcs %1, %1, %2, lsl %3 \n"
41 "subcs %3, %3, #16 \n"
43 "cmp %1, %0, lsl #16 \n"
44 "subge %1, %1, %0, lsl #16 \n"
48 : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit),
49 "+&r"(c->bits), "+&r"(c->buffer)
50 : "r"(high), "r"(pr), "r"(c->end - 1),
51 "0"(shift), "1"(code_word)
57 #define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6
58 static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr)
60 unsigned shift = ff_vp56_norm_shift[c->high];
61 unsigned code_word = c->code_word << shift;
62 unsigned high = c->high << shift;
66 __asm__ ("adds %3, %3, %0 \n"
68 "ldrcsh %2, [%4], #2 \n"
70 "smlabb %0, %5, %6, %0 \n"
72 "orrcs %1, %1, %2, lsl %3 \n"
73 "subcs %3, %3, #16 \n"
76 : "=&r"(low), "+&r"(code_word), "=&r"(tmp),
77 "+&r"(c->bits), "+&r"(c->buffer)
78 : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift)
81 if (code_word >= tmp) {
83 c->code_word = code_word - tmp;
88 c->code_word = code_word;
94 #endif /* AVCODEC_ARM_VP56_ARITH_H */