cabac: move x86 asm to libavcodec/x86/cabac.h

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/libavcodec/x86/cabac.h b/libavcodec/x86/cabac.h
new file mode 100644
index 0000000000..3e5a2217ae
--- /dev/null
+++ b/libavcodec/x86/cabac.h
@@ -0,0 +1,148 @@
+/*
+ * 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, cabac, 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"\
+        "sub    "tmp"       , "low"     \n\t"\
+        "xor    %%ecx       , "ret"     \n\t"
+#else /* HAVE_FAST_CMOV */
+#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, 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, cabac, 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, cabac, 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"\
+        "mov    "tmpbyte"   , "statep"                                  \n\t"\
+        "shl    %%cl        , "low"                                     \n\t"\
+        "test   "lowword"   , "lowword"                                 \n\t"\
+        " jnz   1f                                                      \n\t"\
+        "mov "byte"("cabac"), %%"REG_c"                                 \n\t"\
+        "movzwl (%%"REG_c")     , "tmp"                                 \n\t"\
+        "bswap  "tmp"                                                   \n\t"\
+        "shr    $15         , "tmp"                                     \n\t"\
+        "sub    $0xFFFF     , "tmp"                                     \n\t"\
+        "add    $2          , %%"REG_c"                                 \n\t"\
+        "mov    %%"REG_c"   , "byte    "("cabac")                       \n\t"\
+        "lea    -1("low")   , %%ecx                                     \n\t"\
+        "xor    "low"       , %%ecx                                     \n\t"\
+        "shr    $15         , %%ecx                                     \n\t"\
+        "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx            \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 ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
+#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, low, range, tmp;
+
+    __asm__ volatile(
+        "movl %a6(%5), %2               \n\t"
+        "movl %a7(%5), %1               \n\t"
+        BRANCHLESS_GET_CABAC("%0", "%5", "(%4)", "%1", "%w1", "%2",
+                             "%3", "%b3", "%a8")
+        "movl %2, %a6(%5)               \n\t"
+        "movl %1, %a7(%5)               \n\t"
+
+        :"=&r"(bit), "=&r"(low), "=&r"(range), "=&r"(tmp)
+        :"r"(state), "r"(c),
+         "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
+         "i"(offsetof(CABACContext, bytestream))
+        : "%"REG_c, "memory"
+    );
+    return bit & 1;
+}
+#endif /* ARCH_X86 && 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 %a3(%2), %k1                      \n\t"
+        "movl %a4(%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  %a5(%2), %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, %a5(%2)                       \n\t"
+        "1:                                     \n\t"
+        "movl %%eax, %a4(%2)                    \n\t"
+
+        :"+c"(val), "=&r"(tmp)
+        :"r"(c),
+         "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
+         "i"(offsetof(CABACContext, bytestream))
+        : "%eax", "%edx", "memory"
+    );
+    return val;
+}
+
+#endif /* AVCODEC_X86_CABAC_H */