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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (C) 2010 Mans Rullgard |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVCODEC_ARM_VP56_ARITH_H |
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| 22 | #define AVCODEC_ARM_VP56_ARITH_H |
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| 23 | |||
| 24 | #if CONFIG_THUMB |
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| 25 | # define A(x) |
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| 26 | # define T(x) x |
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| 27 | #else |
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| 28 | # define A(x) x |
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| 29 | # define T(x) |
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| 30 | #endif |
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| 31 | |||
| 32 | #if CONFIG_THUMB || defined __clang__ |
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| 33 | # define L(x) |
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| 34 | # define U(x) x |
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| 35 | #else |
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| 36 | # define L(x) x |
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| 37 | # define U(x) |
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| 38 | #endif |
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| 39 | |||
| 40 | #if HAVE_ARMV6_INLINE |
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| 41 | |||
| 42 | #define vp56_rac_get_prob vp56_rac_get_prob_armv6 |
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| 43 | static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr) |
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| 44 | { |
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| 45 | unsigned shift = ff_vp56_norm_shift[c->high]; |
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| 46 | unsigned code_word = c->code_word << shift; |
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| 47 | unsigned high = c->high << shift; |
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| 48 | unsigned bit; |
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| 49 | |||
| 50 | __asm__ ("adds %3, %3, %0 \n" |
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| 51 | "itt cs \n" |
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| 52 | "cmpcs %7, %4 \n" |
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| 53 | L("ldrcsh %2, [%4], #2 \n") |
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| 54 | U("ldrhcs %2, [%4], #2 \n") |
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| 55 | "rsb %0, %6, #256 \n" |
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| 56 | "smlabb %0, %5, %6, %0 \n" |
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| 57 | T("itttt cs \n") |
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| 58 | "rev16cs %2, %2 \n" |
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| 59 | T("lslcs %2, %2, %3 \n") |
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| 60 | T("orrcs %1, %1, %2 \n") |
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| 61 | A("orrcs %1, %1, %2, lsl %3 \n") |
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| 62 | "subcs %3, %3, #16 \n" |
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| 63 | "lsr %0, %0, #8 \n" |
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| 64 | "cmp %1, %0, lsl #16 \n" |
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| 65 | "ittte ge \n" |
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| 66 | "subge %1, %1, %0, lsl #16 \n" |
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| 67 | "subge %0, %5, %0 \n" |
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| 68 | "movge %2, #1 \n" |
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| 69 | "movlt %2, #0 \n" |
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| 70 | : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit), |
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| 71 | "+&r"(c->bits), "+&r"(c->buffer) |
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| 72 | : "r"(high), "r"(pr), "r"(c->end - 1), |
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| 73 | "0"(shift), "1"(code_word) |
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| 74 | : "cc"); |
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| 75 | |||
| 76 | return bit; |
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| 77 | } |
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| 78 | |||
| 79 | #define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6 |
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| 80 | static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr) |
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| 81 | { |
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| 82 | unsigned shift = ff_vp56_norm_shift[c->high]; |
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| 83 | unsigned code_word = c->code_word << shift; |
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| 84 | unsigned high = c->high << shift; |
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| 85 | unsigned low; |
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| 86 | unsigned tmp; |
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| 87 | |||
| 88 | __asm__ ("adds %3, %3, %0 \n" |
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| 89 | "itt cs \n" |
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| 90 | "cmpcs %7, %4 \n" |
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| 91 | L("ldrcsh %2, [%4], #2 \n") |
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| 92 | U("ldrhcs %2, [%4], #2 \n") |
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| 93 | "rsb %0, %6, #256 \n" |
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| 94 | "smlabb %0, %5, %6, %0 \n" |
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| 95 | T("itttt cs \n") |
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| 96 | "rev16cs %2, %2 \n" |
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| 97 | T("lslcs %2, %2, %3 \n") |
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| 98 | T("orrcs %1, %1, %2 \n") |
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| 99 | A("orrcs %1, %1, %2, lsl %3 \n") |
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| 100 | "subcs %3, %3, #16 \n" |
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| 101 | "lsr %0, %0, #8 \n" |
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| 102 | "lsl %2, %0, #16 \n" |
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| 103 | : "=&r"(low), "+&r"(code_word), "=&r"(tmp), |
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| 104 | "+&r"(c->bits), "+&r"(c->buffer) |
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| 105 | : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift) |
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| 106 | : "cc"); |
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| 107 | |||
| 108 | if (code_word >= tmp) { |
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| 109 | c->high = high - low; |
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| 110 | c->code_word = code_word - tmp; |
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| 111 | return 1; |
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| 112 | } |
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| 113 | |||
| 114 | c->high = low; |
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| 115 | c->code_word = code_word; |
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| 116 | return 0; |
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| 117 | } |
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| 118 | |||
| 119 | #endif |
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| 120 | |||
| 121 | #endif /* AVCODEC_ARM_VP56_ARITH_H */ |