/* * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_X86_CABAC_H #define AVCODEC_X86_CABAC_H #include "libavcodec/cabac.h" #include "libavutil/attributes.h" #include "libavutil/x86_cpu.h" #include "config.h" #if HAVE_FAST_CMOV #define BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, lowword, range, tmp)\ "mov "tmp" , %%ecx \n\t"\ "shl $17 , "tmp" \n\t"\ "cmp "low" , "tmp" \n\t"\ "cmova %%ecx , "range" \n\t"\ "sbb %%ecx , %%ecx \n\t"\ "and %%ecx , "tmp" \n\t"\ "xor %%ecx , "ret" \n\t"\ "sub "tmp" , "low" \n\t" #else /* HAVE_FAST_CMOV */ #define BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, lowword, range, tmp)\ "mov "tmp" , %%ecx \n\t"\ "shl $17 , "tmp" \n\t"\ "sub "low" , "tmp" \n\t"\ "sar $31 , "tmp" \n\t" /*lps_mask*/\ "sub %%ecx , "range" \n\t" /*RangeLPS - range*/\ "and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\ "add %%ecx , "range" \n\t" /*new range*/\ "shl $17 , %%ecx \n\t"\ "and "tmp" , %%ecx \n\t"\ "sub %%ecx , "low" \n\t"\ "xor "tmp" , "ret" \n\t" #endif /* HAVE_FAST_CMOV */ #define BRANCHLESS_GET_CABAC(ret, statep, low, lowword, range, tmp, tmpbyte, byte) \ "movzbl "statep" , "ret" \n\t"\ "mov "range" , "tmp" \n\t"\ "and $0xC0 , "range" \n\t"\ "movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\ "sub "range" , "tmp" \n\t"\ BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, lowword, range, tmp) \ "movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\ "shl %%cl , "range" \n\t"\ "movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\ "shl %%cl , "low" \n\t"\ "mov "tmpbyte" , "statep" \n\t"\ "test "lowword" , "lowword" \n\t"\ " jnz 1f \n\t"\ "mov "byte" , %%"REG_c" \n\t"\ "add"OPSIZE" $2 , "byte" \n\t"\ "movzwl (%%"REG_c") , "tmp" \n\t"\ "lea -1("low") , %%ecx \n\t"\ "xor "low" , %%ecx \n\t"\ "shr $15 , %%ecx \n\t"\ "bswap "tmp" \n\t"\ "shr $15 , "tmp" \n\t"\ "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\ "sub $0xFFFF , "tmp" \n\t"\ "neg %%ecx \n\t"\ "add $7 , %%ecx \n\t"\ "shl %%cl , "tmp" \n\t"\ "add "tmp" , "low" \n\t"\ "1: \n\t" #if HAVE_7REGS && !defined(BROKEN_RELOCATIONS) && !(defined(__i386) && defined(__clang__) && (__clang_major__<2 || (__clang_major__==2 && __clang_minor__<10)))\ && !(defined(__i386) && !defined(__clang__) && defined(__llvm__) && __GNUC__==4 && __GNUC_MINOR__==2 && __GNUC_PATCHLEVEL__<=1) #define get_cabac_inline get_cabac_inline_x86 static av_always_inline int get_cabac_inline_x86(CABACContext *c, uint8_t *const state) { int bit, tmp; __asm__ volatile( BRANCHLESS_GET_CABAC("%0", "(%5)", "%1", "%w1", "%2", "%3", "%b3", "%4") :"=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp), "+m"(c->bytestream) :"r"(state) : "%"REG_c, "memory" ); return bit & 1; } #endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */ #define get_cabac_bypass_sign get_cabac_bypass_sign_x86 static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val) { x86_reg tmp; __asm__ volatile( "movl %4, %k1 \n\t" "movl %2, %%eax \n\t" "shl $17, %k1 \n\t" "add %%eax, %%eax \n\t" "sub %k1, %%eax \n\t" "cltd \n\t" "and %%edx, %k1 \n\t" "add %k1, %%eax \n\t" "xor %%edx, %%ecx \n\t" "sub %%edx, %%ecx \n\t" "test %%ax, %%ax \n\t" " jnz 1f \n\t" "mov %3, %1 \n\t" "subl $0xFFFF, %%eax \n\t" "movzwl (%1), %%edx \n\t" "bswap %%edx \n\t" "shrl $15, %%edx \n\t" "add $2, %1 \n\t" "addl %%edx, %%eax \n\t" "mov %1, %3 \n\t" "1: \n\t" "movl %%eax, %2 \n\t" :"+c"(val), "=&r"(tmp), "+m"(c->low), "+m"(c->bytestream) :"m"(c->range) : "%eax", "%edx" ); return val; } #endif /* AVCODEC_X86_CABAC_H */