vpx_arith.h (4143B)
1 /* 2 * Copyright (C) 2010 Mans Rullgard <mans@mansr.com> 3 * 4 * This file is part of FFmpeg. 5 * 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. 10 * 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. 15 * 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 19 */ 20 21 #ifndef AVCODEC_ARM_VPX_ARITH_H 22 #define AVCODEC_ARM_VPX_ARITH_H 23 24 #if CONFIG_THUMB 25 # define A(x) 26 # define T(x) x 27 #else 28 # define A(x) x 29 # define T(x) 30 #endif 31 32 #if CONFIG_THUMB || defined __clang__ 33 # define L(x) 34 # define U(x) x 35 #else 36 # define L(x) x 37 # define U(x) 38 #endif 39 40 #if HAVE_ARMV6_INLINE 41 42 #define vpx_rac_get_prob vp56_rac_get_prob_armv6 43 static inline int vp56_rac_get_prob_armv6(VPXRangeCoder *c, int pr) 44 { 45 unsigned shift = ff_vpx_norm_shift[c->high]; 46 unsigned code_word = c->code_word << shift; 47 unsigned high = c->high << shift; 48 unsigned bit; 49 50 __asm__ ("adds %3, %3, %0 \n" 51 "itt cs \n" 52 "cmpcs %7, %4 \n" 53 L("ldrcsh %2, [%4], #2 \n") 54 U("ldrhcs %2, [%4], #2 \n") 55 "rsb %0, %6, #256 \n" 56 "smlabb %0, %5, %6, %0 \n" 57 T("itttt cs \n") 58 "rev16cs %2, %2 \n" 59 T("lslcs %2, %2, %3 \n") 60 T("orrcs %1, %1, %2 \n") 61 A("orrcs %1, %1, %2, lsl %3 \n") 62 "subcs %3, %3, #16 \n" 63 "lsr %0, %0, #8 \n" 64 "cmp %1, %0, lsl #16 \n" 65 "ittte ge \n" 66 "subge %1, %1, %0, lsl #16 \n" 67 "subge %0, %5, %0 \n" 68 "movge %2, #1 \n" 69 "movlt %2, #0 \n" 70 : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit), 71 "+&r"(c->bits), "+&r"(c->buffer) 72 : "r"(high), "r"(pr), "r"(c->end - 1), 73 "0"(shift), "1"(code_word) 74 : "cc"); 75 76 return bit; 77 } 78 79 #define vpx_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6 80 static inline int vp56_rac_get_prob_branchy_armv6(VPXRangeCoder *c, int pr) 81 { 82 unsigned shift = ff_vpx_norm_shift[c->high]; 83 unsigned code_word = c->code_word << shift; 84 unsigned high = c->high << shift; 85 unsigned low; 86 unsigned tmp; 87 88 __asm__ ("adds %3, %3, %0 \n" 89 "itt cs \n" 90 "cmpcs %7, %4 \n" 91 L("ldrcsh %2, [%4], #2 \n") 92 U("ldrhcs %2, [%4], #2 \n") 93 "rsb %0, %6, #256 \n" 94 "smlabb %0, %5, %6, %0 \n" 95 T("itttt cs \n") 96 "rev16cs %2, %2 \n" 97 T("lslcs %2, %2, %3 \n") 98 T("orrcs %1, %1, %2 \n") 99 A("orrcs %1, %1, %2, lsl %3 \n") 100 "subcs %3, %3, #16 \n" 101 "lsr %0, %0, #8 \n" 102 "lsl %2, %0, #16 \n" 103 : "=&r"(low), "+&r"(code_word), "=&r"(tmp), 104 "+&r"(c->bits), "+&r"(c->buffer) 105 : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift) 106 : "cc"); 107 108 if (code_word >= tmp) { 109 c->high = high - low; 110 c->code_word = code_word - tmp; 111 return 1; 112 } 113 114 c->high = low; 115 c->code_word = code_word; 116 return 0; 117 } 118 119 #endif 120 121 #endif /* AVCODEC_ARM_VPX_ARITH_H */