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
32 #if HAVE_ARMV6 && HAVE_INLINE_ASM
34 #define vp56_rac_get_prob vp56_rac_get_prob_armv6
35 static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr)
37 unsigned shift = ff_vp56_norm_shift[c->high];
38 unsigned code_word = c->code_word << shift;
39 unsigned high = c->high << shift;
42 __asm__ ("adds %3, %3, %0 \n"
45 A("ldrcsh %2, [%4], #2 \n")
46 T("ldrhcs %2, [%4], #2 \n")
48 "smlabb %0, %5, %6, %0 \n"
51 T("lslcs %2, %2, %3 \n")
52 T("orrcs %1, %1, %2 \n")
53 A("orrcs %1, %1, %2, lsl %3 \n")
54 "subcs %3, %3, #16 \n"
56 "cmp %1, %0, lsl #16 \n"
58 "subge %1, %1, %0, lsl #16 \n"
62 : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit),
63 "+&r"(c->bits), "+&r"(c->buffer)
64 : "r"(high), "r"(pr), "r"(c->end - 1),
65 "0"(shift), "1"(code_word)
71 #define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6
72 static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr)
74 unsigned shift = ff_vp56_norm_shift[c->high];
75 unsigned code_word = c->code_word << shift;
76 unsigned high = c->high << shift;
80 __asm__ ("adds %3, %3, %0 \n"
83 A("ldrcsh %2, [%4], #2 \n")
84 T("ldrhcs %2, [%4], #2 \n")
86 "smlabb %0, %5, %6, %0 \n"
89 T("lslcs %2, %2, %3 \n")
90 T("orrcs %1, %1, %2 \n")
91 A("orrcs %1, %1, %2, lsl %3 \n")
92 "subcs %3, %3, #16 \n"
95 : "=&r"(low), "+&r"(code_word), "=&r"(tmp),
96 "+&r"(c->bits), "+&r"(c->buffer)
97 : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift)
100 if (code_word >= tmp) {
101 c->high = high - low;
102 c->code_word = code_word - tmp;
107 c->code_word = code_word;
113 #endif /* AVCODEC_ARM_VP56_ARITH_H */