/* * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> * * 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 */ /** * @file * H.264 / AVC / MPEG-4 part10 codec. * non-SIMD x86-specific optimizations for H.264 * @author Michael Niedermayer <michaelni@gmx.at> */ #include <stddef.h> #include "libavcodec/cabac.h" #include "cabac.h" #if HAVE_INLINE_ASM #if ARCH_X86_64 #define REG64 "r" #else #define REG64 "m" #endif //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet //as that would make optimization work hard) #if HAVE_7REGS && !BROKEN_COMPILER #define decode_significance decode_significance_x86 static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index, x86_reg last_off){ void *end= significant_coeff_ctx_base + max_coeff - 1; int minusstart= -(intptr_t)significant_coeff_ctx_base; int minusindex= 4-(intptr_t)index; int bit; x86_reg coeff_count; #ifdef BROKEN_RELOCATIONS void *tables; __asm__ volatile( "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t" : "=&r"(tables) : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables) ); #endif __asm__ volatile( "3: \n\t" BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3", "%5", "%q5", "%k0", "%b0", "%c11(%6)", "%c12(%6)", AV_STRINGIFY(H264_NORM_SHIFT_OFFSET), AV_STRINGIFY(H264_LPS_RANGE_OFFSET), AV_STRINGIFY(H264_MLPS_STATE_OFFSET), "%13") "test $1, %4 \n\t" " jz 4f \n\t" "add %10, %1 \n\t" BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3", "%5", "%q5", "%k0", "%b0", "%c11(%6)", "%c12(%6)", AV_STRINGIFY(H264_NORM_SHIFT_OFFSET), AV_STRINGIFY(H264_LPS_RANGE_OFFSET), AV_STRINGIFY(H264_MLPS_STATE_OFFSET), "%13") "sub %10, %1 \n\t" "mov %2, %0 \n\t" "movl %7, %%ecx \n\t" "add %1, %%"FF_REG_c" \n\t" "movl %%ecx, (%0) \n\t" "test $1, %4 \n\t" " jnz 5f \n\t" "add"FF_OPSIZE" $4, %2 \n\t" "4: \n\t" "add $1, %1 \n\t" "cmp %8, %1 \n\t" " jb 3b \n\t" "mov %2, %0 \n\t" "movl %7, %%ecx \n\t" "add %1, %%"FF_REG_c" \n\t" "movl %%ecx, (%0) \n\t" "5: \n\t" "add %9, %k0 \n\t" "shr $2, %k0 \n\t" : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index), "+&r"(c->low), "=&r"(bit), "+&r"(c->range) : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off), "i"(offsetof(CABACContext, bytestream)), "i"(offsetof(CABACContext, bytestream_end)) TABLES_ARG : "%"FF_REG_c, "memory" ); return coeff_count; } #define decode_significance_8x8 decode_significance_8x8_x86 static int decode_significance_8x8_x86(CABACContext *c, uint8_t *significant_coeff_ctx_base, int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){ int minusindex= 4-(intptr_t)index; int bit; x86_reg coeff_count; x86_reg last=0; x86_reg state; #ifdef BROKEN_RELOCATIONS void *tables; __asm__ volatile( "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t" : "=&r"(tables) : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables) ); #endif __asm__ volatile( "mov %1, %6 \n\t" "3: \n\t" "mov %10, %0 \n\t" "movzb (%0, %6), %6 \n\t" "add %9, %6 \n\t" BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3", "%5", "%q5", "%k0", "%b0", "%c12(%7)", "%c13(%7)", AV_STRINGIFY(H264_NORM_SHIFT_OFFSET), AV_STRINGIFY(H264_LPS_RANGE_OFFSET), AV_STRINGIFY(H264_MLPS_STATE_OFFSET), "%15") "mov %1, %6 \n\t" "test $1, %4 \n\t" " jz 4f \n\t" #ifdef BROKEN_RELOCATIONS "movzb %c14(%15, %q6), %6\n\t" #else "movzb "MANGLE(ff_h264_cabac_tables)"+%c14(%6), %6\n\t" #endif "add %11, %6 \n\t" BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3", "%5", "%q5", "%k0", "%b0", "%c12(%7)", "%c13(%7)", AV_STRINGIFY(H264_NORM_SHIFT_OFFSET), AV_STRINGIFY(H264_LPS_RANGE_OFFSET), AV_STRINGIFY(H264_MLPS_STATE_OFFSET), "%15") "mov %2, %0 \n\t" "mov %1, %6 \n\t" "mov %k6, (%0) \n\t" "test $1, %4 \n\t" " jnz 5f \n\t" "add"FF_OPSIZE" $4, %2 \n\t" "4: \n\t" "add $1, %6 \n\t" "mov %6, %1 \n\t" "cmp $63, %6 \n\t" " jb 3b \n\t" "mov %2, %0 \n\t" "mov %k6, (%0) \n\t" "5: \n\t" "addl %8, %k0 \n\t" "shr $2, %k0 \n\t" : "=&q"(coeff_count), "+"REG64(last), "+"REG64(index), "+&r"(c->low), "=&r"(bit), "+&r"(c->range), "=&r"(state) : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), REG64(sig_off), REG64(last_coeff_ctx_base), "i"(offsetof(CABACContext, bytestream)), "i"(offsetof(CABACContext, bytestream_end)), "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG : "%"FF_REG_c, "memory" ); return coeff_count; } #endif /* HAVE_7REGS && BROKEN_COMPILER */ #endif /* HAVE_INLINE_ASM */