/* * Copyright (C) 2010 Mans Rullgard <mans@mansr.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_ARM_VP56_ARITH_H #define AVCODEC_ARM_VP56_ARITH_H #if CONFIG_THUMB # define A(x) # define T(x) x #else # define A(x) x # define T(x) #endif #if CONFIG_THUMB || defined __clang__ # define L(x) # define U(x) x #else # define L(x) x # define U(x) #endif #if HAVE_ARMV6 && HAVE_INLINE_ASM #define vp56_rac_get_prob vp56_rac_get_prob_armv6 static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr) { unsigned shift = ff_vp56_norm_shift[c->high]; unsigned code_word = c->code_word << shift; unsigned high = c->high << shift; unsigned bit; __asm__ ("adds %3, %3, %0 \n" "itt cs \n" "cmpcs %7, %4 \n" L("ldrcsh %2, [%4], #2 \n") U("ldrhcs %2, [%4], #2 \n") "rsb %0, %6, #256 \n" "smlabb %0, %5, %6, %0 \n" T("itttt cs \n") "rev16cs %2, %2 \n" T("lslcs %2, %2, %3 \n") T("orrcs %1, %1, %2 \n") A("orrcs %1, %1, %2, lsl %3 \n") "subcs %3, %3, #16 \n" "lsr %0, %0, #8 \n" "cmp %1, %0, lsl #16 \n" "ittte ge \n" "subge %1, %1, %0, lsl #16 \n" "subge %0, %5, %0 \n" "movge %2, #1 \n" "movlt %2, #0 \n" : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit), "+&r"(c->bits), "+&r"(c->buffer) : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift), "1"(code_word) : "cc"); return bit; } #define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6 static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr) { unsigned shift = ff_vp56_norm_shift[c->high]; unsigned code_word = c->code_word << shift; unsigned high = c->high << shift; unsigned low; unsigned tmp; __asm__ ("adds %3, %3, %0 \n" "itt cs \n" "cmpcs %7, %4 \n" L("ldrcsh %2, [%4], #2 \n") U("ldrhcs %2, [%4], #2 \n") "rsb %0, %6, #256 \n" "smlabb %0, %5, %6, %0 \n" T("itttt cs \n") "rev16cs %2, %2 \n" T("lslcs %2, %2, %3 \n") T("orrcs %1, %1, %2 \n") A("orrcs %1, %1, %2, lsl %3 \n") "subcs %3, %3, #16 \n" "lsr %0, %0, #8 \n" "lsl %2, %0, #16 \n" : "=&r"(low), "+&r"(code_word), "=&r"(tmp), "+&r"(c->bits), "+&r"(c->buffer) : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift) : "cc"); if (code_word >= tmp) { c->high = high - low; c->code_word = code_word - tmp; return 1; } c->high = low; c->code_word = code_word; return 0; } #endif #endif /* AVCODEC_ARM_VP56_ARITH_H */