/* * Copyright (c) 2003 Michael Niedermayer * * 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/asm.h" #include "libavutil/internal.h" #include "config.h" #if HAVE_INLINE_ASM #ifdef BROKEN_RELOCATIONS #define TABLES_ARG , "r"(tables) #if HAVE_FAST_CMOV #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \ "cmp "low" , "tmp" \n\t"\ "cmova %%ecx , "range" \n\t"\ "sbb %%rcx , %%rcx \n\t"\ "and %%ecx , "tmp" \n\t"\ "xor %%rcx , "retq" \n\t"\ "sub "tmp" , "low" \n\t" #else /* HAVE_FAST_CMOV */ #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \ /* P4 Prescott has crappy cmov,sbb,64bit shift so avoid them */ \ "sub "low" , "tmp" \n\t"\ "sar $31 , "tmp" \n\t"\ "sub %%ecx , "range" \n\t"\ "and "tmp" , "range" \n\t"\ "add %%ecx , "range" \n\t"\ "shl $17 , %%ecx \n\t"\ "and "tmp" , %%ecx \n\t"\ "sub %%ecx , "low" \n\t"\ "xor "tmp" , "ret" \n\t"\ "movslq "ret" , "retq" \n\t" #endif /* HAVE_FAST_CMOV */ #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \ "movzbl "statep" , "ret" \n\t"\ "mov "range" , "tmp" \n\t"\ "and $0xC0 , "range" \n\t"\ "lea ("ret", "range", 2), %%ecx \n\t"\ "movzbl "lps_off"("tables", %%rcx), "range" \n\t"\ "sub "range" , "tmp" \n\t"\ "mov "tmp" , %%ecx \n\t"\ "shl $17 , "tmp" \n\t"\ BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \ "movzbl "norm_off"("tables", "rangeq"), %%ecx \n\t"\ "shl %%cl , "range" \n\t"\ "movzbl "mlps_off"+128("tables", "retq"), "tmp" \n\t"\ "shl %%cl , "low" \n\t"\ "mov "tmpbyte" , "statep" \n\t"\ "test "lowword" , "lowword" \n\t"\ "jnz 2f \n\t"\ "mov "byte" , %%"REG_c" \n\t"\ "cmp "end" , %%"REG_c" \n\t"\ "jge 1f \n\t"\ "add"OPSIZE" $2 , "byte" \n\t"\ "1: \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 "norm_off"("tables", %%rcx), %%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"\ "2: \n\t" #else /* BROKEN_RELOCATIONS */ #define TABLES_ARG #if HAVE_FAST_CMOV #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, 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, low, 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, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \ "movzbl "statep" , "ret" \n\t"\ "mov "range" , "tmp" \n\t"\ "and $0xC0 , "range" \n\t"\ "movzbl "MANGLE(ff_h264_cabac_tables)"+"lps_off"("ret", "range", 2), "range" \n\t"\ "sub "range" , "tmp" \n\t"\ BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp) \ "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"("range"), %%ecx \n\t"\ "shl %%cl , "range" \n\t"\ "movzbl "MANGLE(ff_h264_cabac_tables)"+"mlps_off"+128("ret"), "tmp" \n\t"\ "shl %%cl , "low" \n\t"\ "mov "tmpbyte" , "statep" \n\t"\ "test "lowword" , "lowword" \n\t"\ " jnz 2f \n\t"\ "mov "byte" , %%"REG_c" \n\t"\ "cmp "end" , %%"REG_c" \n\t"\ "jge 1f \n\t"\ "add"OPSIZE" $2 , "byte" \n\t"\ "1: \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_cabac_tables)"+"norm_off"(%%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"\ "2: \n\t" #endif /* BROKEN_RELOCATIONS */ #if HAVE_7REGS #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; #ifdef BROKEN_RELOCATIONS void *tables; __asm__ volatile( "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t" : "=&r"(tables) ); #endif __asm__ volatile( BRANCHLESS_GET_CABAC("%0", "%q0", "(%4)", "%1", "%w1", "%2", "%q2", "%3", "%b3", "%a6(%5)", "%a7(%5)", "%a8", "%a9", "%a10", "%11") : "=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp) : "r"(state), "r"(c), "i"(offsetof(CABACContext, bytestream)), "i"(offsetof(CABACContext, bytestream_end)), "i"(H264_NORM_SHIFT_OFFSET), "i"(H264_LPS_RANGE_OFFSET), "i"(H264_MLPS_STATE_OFFSET) TABLES_ARG : "%"REG_c, "memory" ); return bit & 1; } #endif /* HAVE_7REGS */ #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 %a6(%2), %k1 \n\t" "movl %a3(%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 %a4(%2), %1 \n\t" "subl $0xFFFF, %%eax \n\t" "movzwl (%1), %%edx \n\t" "bswap %%edx \n\t" "shrl $15, %%edx \n\t" "addl %%edx, %%eax \n\t" "cmp %a5(%2), %1 \n\t" "jge 1f \n\t" "add"OPSIZE" $2, %a4(%2) \n\t" "1: \n\t" "movl %%eax, %a3(%2) \n\t" : "+c"(val), "=&r"(tmp) : "r"(c), "i"(offsetof(CABACContext, low)), "i"(offsetof(CABACContext, bytestream)), "i"(offsetof(CABACContext, bytestream_end)), "i"(offsetof(CABACContext, range)) : "%eax", "%edx", "memory" ); return val; } #endif /* HAVE_INLINE_ASM */ #endif /* AVCODEC_X86_CABAC_H */