/* * Copyright (c) 2003 Michael Niedermayer * * 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_X86_CABAC_H #define AVCODEC_X86_CABAC_H #include "libavcodec/cabac.h" #include "libavutil/attributes.h" #include "libavutil/macros.h" #include "libavutil/x86/asm.h" #include "config.h" #if (defined(__i386) && defined(__clang__) && (__clang_major__<2 || (__clang_major__==2 && __clang_minor__<10)))\ || ( !defined(__clang__) && defined(__llvm__) && __GNUC__==4 && __GNUC_MINOR__==2 && __GNUC_PATCHLEVEL__<=1) # define BROKEN_COMPILER 1 #else # define BROKEN_COMPILER 0 #endif #if HAVE_INLINE_ASM #ifndef UNCHECKED_BITSTREAM_READER #define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER #endif #if UNCHECKED_BITSTREAM_READER #define END_CHECK(end) "" #else #define END_CHECK(end) \ "cmp "end" , %%"REG_c" \n\t"\ "jge 1f \n\t" #endif #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"\ END_CHECK(end)\ "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 NAMED_CONSTRAINTS_ADD(ff_h264_cabac_tables) #define RIP_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"\ END_CHECK(end)\ "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 && !BROKEN_COMPILER #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) : NAMED_CONSTRAINTS(ff_h264_cabac_tables) ); #endif __asm__ volatile( BRANCHLESS_GET_CABAC("%0", "%q0", "(%4)", "%1", "%w1", "%2", "%q2", "%3", "%b3", "%c6(%5)", "%c7(%5)", AV_STRINGIFY(H264_NORM_SHIFT_OFFSET), AV_STRINGIFY(H264_LPS_RANGE_OFFSET), AV_STRINGIFY(H264_MLPS_STATE_OFFSET), "%8") : "=&r"(bit), "=&r"(c->low), "=&r"(c->range), "=&q"(tmp) : "r"(state), "r"(c), "i"(offsetof(CABACContext, bytestream)), "i"(offsetof(CABACContext, bytestream_end)) TABLES_ARG ,"1"(c->low), "2"(c->range) : "%"REG_c, "memory" ); return bit & 1; } #endif /* HAVE_7REGS */ #if !BROKEN_COMPILER #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 %c6(%2), %k1 \n\t" "movl %c3(%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 %c4(%2), %1 \n\t" "subl $0xFFFF, %%eax \n\t" "movzwl (%1), %%edx \n\t" "bswap %%edx \n\t" "shrl $15, %%edx \n\t" #if UNCHECKED_BITSTREAM_READER "add $2, %1 \n\t" "addl %%edx, %%eax \n\t" "mov %1, %c4(%2) \n\t" #else "addl %%edx, %%eax \n\t" "cmp %c5(%2), %1 \n\t" "jge 1f \n\t" "add"OPSIZE" $2, %c4(%2) \n\t" #endif "1: \n\t" "movl %%eax, %c3(%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; } #define get_cabac_bypass get_cabac_bypass_x86 static av_always_inline int get_cabac_bypass_x86(CABACContext *c) { x86_reg tmp; int res; __asm__ volatile( "movl %c6(%2), %k1 \n\t" "movl %c3(%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" "inc %%edx \n\t" "test %%ax, %%ax \n\t" "jnz 1f \n\t" "mov %c4(%2), %1 \n\t" "subl $0xFFFF, %%eax \n\t" "movzwl (%1), %%ecx \n\t" "bswap %%ecx \n\t" "shrl $15, %%ecx \n\t" "addl %%ecx, %%eax \n\t" "cmp %c5(%2), %1 \n\t" "jge 1f \n\t" "add"OPSIZE" $2, %c4(%2) \n\t" "1: \n\t" "movl %%eax, %c3(%2) \n\t" : "=&d"(res), "=&r"(tmp) : "r"(c), "i"(offsetof(CABACContext, low)), "i"(offsetof(CABACContext, bytestream)), "i"(offsetof(CABACContext, bytestream_end)), "i"(offsetof(CABACContext, range)) : "%eax", "%ecx", "memory" ); return res; } #endif /* !BROKEN_COMPILER */ #endif /* HAVE_INLINE_ASM */ #endif /* AVCODEC_X86_CABAC_H */