Redo r12838, this time using svn copy to create h264_i386.h from cabac.h.

Move decode_significance_x86() and decode_significance_8x8_x86() to
i386-specific file from cabac.h.
New file is h264-oriented and only included from h264.c
Resolves compilation when configured with --disable-optimizations due to
decode_significance_8x8_x86 using last_coeff_flag_offset_8x8, which is
only defined in h264.c

Originally committed as revision 12846 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 144 insertions, 0 deletions

diff --git a/libavcodec/i386/h264_i386.h b/libavcodec/i386/h264_i386.h
new file mode 100644
index 0000000000..79ef5299ad
--- /dev/null
+++ b/libavcodec/i386/h264_i386.h
@@ -0,0 +1,144 @@
+/*
+ * 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 h264_i386.h
+ * H.264 / AVC / MPEG4 part10 codec.
+ * non-MMX i386-specific optimizations for H.264
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#ifndef FFMPEG_H264_I386_H
+#define FFMPEG_H264_I386_H
+
+
+#include "cabac.h"
+
+//FIXME use some macros to avoid duplicatin get_cabac (cannot be done yet as that would make optimization work hard)
+#if defined(ARCH_X86) && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
+static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index){
+    void *end= significant_coeff_ctx_base + max_coeff - 1;
+    int minusstart= -(int)significant_coeff_ctx_base;
+    int minusindex= 4-(int)index;
+    int coeff_count;
+    asm volatile(
+        "movl "RANGE    "(%3), %%esi            \n\t"
+        "movl "LOW      "(%3), %%ebx            \n\t"
+
+        "2:                                     \n\t"
+
+        BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
+
+        "test $1, %%edx                         \n\t"
+        " jz 3f                                 \n\t"
+
+        BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
+
+        "mov  %2, %%"REG_a"                     \n\t"
+        "movl %4, %%ecx                         \n\t"
+        "add  %1, %%"REG_c"                     \n\t"
+        "movl %%ecx, (%%"REG_a")                \n\t"
+
+        "test $1, %%edx                         \n\t"
+        " jnz 4f                                \n\t"
+
+        "add  $4, %%"REG_a"                     \n\t"
+        "mov  %%"REG_a", %2                     \n\t"
+
+        "3:                                     \n\t"
+        "add  $1, %1                            \n\t"
+        "cmp  %5, %1                            \n\t"
+        " jb 2b                                 \n\t"
+        "mov  %2, %%"REG_a"                     \n\t"
+        "movl %4, %%ecx                         \n\t"
+        "add  %1, %%"REG_c"                     \n\t"
+        "movl %%ecx, (%%"REG_a")                \n\t"
+        "4:                                     \n\t"
+        "add  %6, %%eax                         \n\t"
+        "shr $2, %%eax                          \n\t"
+
+        "movl %%esi, "RANGE    "(%3)            \n\t"
+        "movl %%ebx, "LOW      "(%3)            \n\t"
+        :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
+        :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)
+        : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
+    );
+    return coeff_count;
+}
+
+static int decode_significance_8x8_x86(CABACContext *c, uint8_t *significant_coeff_ctx_base, int *index, const uint8_t *sig_off){
+    int minusindex= 4-(int)index;
+    int coeff_count;
+    long last=0;
+    asm volatile(
+        "movl "RANGE    "(%3), %%esi            \n\t"
+        "movl "LOW      "(%3), %%ebx            \n\t"
+
+        "mov %1, %%"REG_D"                      \n\t"
+        "2:                                     \n\t"
+
+        "mov %6, %%"REG_a"                      \n\t"
+        "movzbl (%%"REG_a", %%"REG_D"), %%edi   \n\t"
+        "add %5, %%"REG_D"                      \n\t"
+
+        BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
+
+        "mov %1, %%edi                          \n\t"
+        "test $1, %%edx                         \n\t"
+        " jz 3f                                 \n\t"
+
+        "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
+        "add %5, %%"REG_D"                      \n\t"
+
+        BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
+
+        "mov %2, %%"REG_a"                      \n\t"
+        "mov %1, %%edi                          \n\t"
+        "movl %%edi, (%%"REG_a")                \n\t"
+
+        "test $1, %%edx                         \n\t"
+        " jnz 4f                                \n\t"
+
+        "add $4, %%"REG_a"                      \n\t"
+        "mov %%"REG_a", %2                      \n\t"
+
+        "3:                                     \n\t"
+        "addl $1, %%edi                         \n\t"
+        "mov %%edi, %1                          \n\t"
+        "cmpl $63, %%edi                        \n\t"
+        " jb 2b                                 \n\t"
+        "mov %2, %%"REG_a"                      \n\t"
+        "movl %%edi, (%%"REG_a")                \n\t"
+        "4:                                     \n\t"
+        "addl %4, %%eax                         \n\t"
+        "shr $2, %%eax                          \n\t"
+
+        "movl %%esi, "RANGE    "(%3)            \n\t"
+        "movl %%ebx, "LOW      "(%3)            \n\t"
+        :"=&a"(coeff_count),"+m"(last), "+m"(index)
+        :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)
+        : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
+    );
+    return coeff_count;
+}
+#endif /* defined(ARCH_X86) && && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */
+
+#endif /* FFMPEG_H264_I386_H */