* [FFmpeg-devel] [PATCH] avutil/crc: add x86 SSE4.2 clmul SIMD implementation for av_crc (PR #20751)
@ 2025-10-25 16:59 Shreesh Adiga via ffmpeg-devel
0 siblings, 0 replies; only message in thread
From: Shreesh Adiga via ffmpeg-devel @ 2025-10-25 16:59 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: Shreesh Adiga
PR #20751 opened by Shreesh Adiga (tantei3)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20751
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20751.patch
Implemented the algorithm described in the paper titled
"Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction"
by Intel.
Added function pointer indirection for av_crc, av_crc_get_table and
av_crc_init to match the current API for x86.
Added checkasm test to check all the input len from 0 to 200 to cover
the different loops in ASM, along with different initial CRC values
for all the types supported by libavutil.
Observed near 10x speedup on AMD Zen4 7950x:
av_crc_c: 22057.0 ( 1.00x)
av_crc_clmul: 2202.8 (10.01x)
Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
>From 8d9e0e77250906f89f01766c5866629d410a4828 Mon Sep 17 00:00:00 2001
From: Shreesh Adiga <16567adigashreesh@gmail.com>
Date: Sat, 25 Oct 2025 21:48:15 +0530
Subject: [PATCH] avutil/crc: add x86 SSE4.2 clmul SIMD implementation for
av_crc
Implemented the algorithm described in the paper titled
"Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction"
by Intel.
Added function pointer indirection for av_crc, av_crc_get_table and
av_crc_init to match the current API for x86.
Added checkasm test to check all the input len from 0 to 200 to cover
the different loops in ASM, along with different initial CRC values
for all the types supported by libavutil.
Observed near 10x speedup on AMD Zen4 7950x:
av_crc_c: 22057.0 ( 1.00x)
av_crc_clmul: 2202.8 (10.01x)
Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
---
configure | 4 +
libavutil/cpu.c | 1 +
libavutil/cpu.h | 1 +
libavutil/crc.c | 77 +++++++-
libavutil/tests/cpu.c | 1 +
libavutil/x86/Makefile | 16 +-
libavutil/x86/cpu.c | 2 +
libavutil/x86/cpu.h | 2 +
libavutil/x86/crc.asm | 297 +++++++++++++++++++++++++++++
libavutil/x86/crc.h | 38 ++++
libavutil/x86/crc_init.c | 233 +++++++++++++++++++++++
tests/checkasm/Makefile | 1 +
tests/checkasm/checkasm.c | 2 +
tests/checkasm/checkasm.h | 1 +
tests/checkasm/crc.c | 386 ++++++++++++++++++++++++++++++++++++++
15 files changed, 1046 insertions(+), 16 deletions(-)
create mode 100644 libavutil/x86/crc.asm
create mode 100644 libavutil/x86/crc.h
create mode 100644 libavutil/x86/crc_init.c
create mode 100644 tests/checkasm/crc.c
diff --git a/configure b/configure
index ed4f8c4a94..8a74691d16 100755
--- a/configure
+++ b/configure
@@ -469,6 +469,7 @@ Optimization options (experts only):
--disable-avx512 disable AVX-512 optimizations
--disable-avx512icl disable AVX-512ICL optimizations
--disable-aesni disable AESNI optimizations
+ --disable-clmul disable CLMUL optimizations
--disable-armv5te disable armv5te optimizations
--disable-armv6 disable armv6 optimizations
--disable-armv6t2 disable armv6t2 optimizations
@@ -2252,6 +2253,7 @@ ARCH_EXT_LIST_WASM="
ARCH_EXT_LIST_X86_SIMD="
aesni
+ clmul
amd3dnow
amd3dnowext
avx
@@ -2871,6 +2873,7 @@ ssse3_deps="sse3"
sse4_deps="ssse3"
sse42_deps="sse4"
aesni_deps="sse42"
+clmul_deps="sse42"
avx_deps="sse42"
xop_deps="avx"
fma3_deps="avx"
@@ -8180,6 +8183,7 @@ if enabled x86; then
echo "SSE enabled ${sse-no}"
echo "SSSE3 enabled ${ssse3-no}"
echo "AESNI enabled ${aesni-no}"
+ echo "CLMUL enabled ${clmul-no}"
echo "AVX enabled ${avx-no}"
echo "AVX2 enabled ${avx2-no}"
echo "AVX-512 enabled ${avx512-no}"
diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index 8f9b785ebc..0ddbc50da5 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -149,6 +149,7 @@ int av_parse_cpu_caps(unsigned *flags, const char *s)
{ "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT }, .unit = "flags" },
{ "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
{ "aesni", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AESNI }, .unit = "flags" },
+ { "clmul", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CLMUL }, .unit = "flags" },
{ "avx512" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX512 }, .unit = "flags" },
{ "avx512icl", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX512ICL }, .unit = "flags" },
{ "slowgather", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SLOW_GATHER }, .unit = "flags" },
diff --git a/libavutil/cpu.h b/libavutil/cpu.h
index 5ef5da58eb..c63718d10f 100644
--- a/libavutil/cpu.h
+++ b/libavutil/cpu.h
@@ -45,6 +45,7 @@
#define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
#define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
#define AV_CPU_FLAG_AESNI 0x80000 ///< Advanced Encryption Standard functions
+#define AV_CPU_FLAG_CLMUL 0x400000 ///< Carry-less Multiplication instruction
#define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
#define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer)
#define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
diff --git a/libavutil/crc.c b/libavutil/crc.c
index 703b56f4e0..52c604625a 100644
--- a/libavutil/crc.c
+++ b/libavutil/crc.c
@@ -25,6 +25,7 @@
#include "bswap.h"
#include "crc.h"
#include "error.h"
+#include "x86/crc.h"
#if CONFIG_HARDCODED_TABLES
static const AVCRC av_crc_table[AV_CRC_MAX][257] = {
@@ -319,11 +320,13 @@ static const AVCRC av_crc_table[AV_CRC_MAX][257] = {
#endif
static AVCRC av_crc_table[AV_CRC_MAX][CRC_TABLE_SIZE];
-#define DECLARE_CRC_INIT_TABLE_ONCE(id, le, bits, poly) \
-static AVOnce id ## _once_control = AV_ONCE_INIT; \
-static void id ## _init_table_once(void) \
-{ \
- av_assert0(av_crc_init(av_crc_table[id], le, bits, poly, sizeof(av_crc_table[id])) >= 0); \
+static int av_crc_init_c(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
+
+#define DECLARE_CRC_INIT_TABLE_ONCE(id, le, bits, poly) \
+static AVOnce id ## _once_control = AV_ONCE_INIT; \
+static void id ## _init_table_once(void) \
+{ \
+ av_assert0(av_crc_init_c(av_crc_table[id], le, bits, poly, sizeof(av_crc_table[id])) >= 0); \
}
#define CRC_INIT_TABLE_ONCE(id) ff_thread_once(&id ## _once_control, id ## _init_table_once)
@@ -338,7 +341,7 @@ DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_32_IEEE_LE, 1, 32, 0xEDB88320)
DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_16_ANSI_LE, 1, 16, 0xA001)
#endif
-int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
+static int av_crc_init_c(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
{
unsigned i, j;
uint32_t c;
@@ -371,7 +374,7 @@ int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
return 0;
}
-const AVCRC *av_crc_get_table(AVCRCId crc_id)
+static const AVCRC *av_crc_get_table_c(AVCRCId crc_id)
{
#if !CONFIG_HARDCODED_TABLES
switch (crc_id) {
@@ -389,8 +392,8 @@ const AVCRC *av_crc_get_table(AVCRCId crc_id)
return av_crc_table[crc_id];
}
-uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
- const uint8_t *buffer, size_t length)
+static uint32_t av_crc_c(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length)
{
const uint8_t *end = buffer + length;
@@ -413,3 +416,59 @@ uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
return crc;
}
+
+static const AVCRC *av_crc_get_table_dispatch(AVCRCId crc_id);
+static uint32_t av_crc_dispatch(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length);
+static int av_crc_init_dispatch(AVCRC *ctx, int le, int bits,
+ uint32_t poly, int ctx_size);
+
+const AVCRC *(*av_crc_get_table_func)(AVCRCId crc_id) = av_crc_get_table_dispatch;
+uint32_t (*av_crc_func)(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length) = av_crc_dispatch;
+int (*av_crc_init_func)(AVCRC *ctx, int le, int bits,
+ uint32_t poly, int ctx_size) = av_crc_init_dispatch;
+
+void av_crc_init_fn(void) {
+ av_crc_get_table_func = av_crc_get_table_c;
+ av_crc_func = av_crc_c;
+ av_crc_init_func = av_crc_init_c;
+#if ARCH_X86
+ av_crc_init_x86();
+#endif
+}
+
+static const AVCRC *av_crc_get_table_dispatch(AVCRCId crc_id)
+{
+ av_crc_init_fn();
+ return av_crc_get_table_func(crc_id);
+}
+
+static uint32_t av_crc_dispatch(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length)
+{
+ av_crc_init_fn();
+ return av_crc_func(ctx, crc, buffer, length);
+}
+
+static int av_crc_init_dispatch(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
+{
+ av_crc_init_fn();
+ return av_crc_init_func(ctx, le, bits, poly, ctx_size);
+}
+
+uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length)
+{
+ return av_crc_func(ctx, crc, buffer, length);
+}
+
+const AVCRC *av_crc_get_table(AVCRCId crc_id)
+{
+ return av_crc_get_table_func(crc_id);
+}
+
+int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
+{
+ return av_crc_init_func(ctx, le, bits, poly, ctx_size);
+}
diff --git a/libavutil/tests/cpu.c b/libavutil/tests/cpu.c
index fd2e32901d..6f8a0be2c3 100644
--- a/libavutil/tests/cpu.c
+++ b/libavutil/tests/cpu.c
@@ -88,6 +88,7 @@ static const struct {
{ AV_CPU_FLAG_BMI1, "bmi1" },
{ AV_CPU_FLAG_BMI2, "bmi2" },
{ AV_CPU_FLAG_AESNI, "aesni" },
+ { AV_CPU_FLAG_CLMUL, "clmul" },
{ AV_CPU_FLAG_AVX512, "avx512" },
{ AV_CPU_FLAG_AVX512ICL, "avx512icl" },
{ AV_CPU_FLAG_SLOW_GATHER, "slowgather" },
diff --git a/libavutil/x86/Makefile b/libavutil/x86/Makefile
index 8cfd646108..8a721ecd05 100644
--- a/libavutil/x86/Makefile
+++ b/libavutil/x86/Makefile
@@ -1,5 +1,6 @@
OBJS += x86/aes_init.o \
x86/cpu.o \
+ x86/crc_init.o \
x86/fixed_dsp_init.o \
x86/float_dsp_init.o \
x86/imgutils_init.o \
@@ -12,12 +13,13 @@ OBJS-$(CONFIG_PIXELUTILS) += x86/pixelutils_init.o \
EMMS_OBJS_$(HAVE_MMX_INLINE)_$(HAVE_MMX_EXTERNAL)_$(HAVE_MM_EMPTY) = x86/emms.o
X86ASM-OBJS += x86/aes.o \
- x86/cpuid.o \
- $(EMMS_OBJS__yes_) \
- x86/fixed_dsp.o \
- x86/float_dsp.o \
- x86/imgutils.o \
- x86/lls.o \
- x86/tx_float.o \
+ x86/cpuid.o \
+ x86/crc.o \
+ $(EMMS_OBJS__yes_) \
+ x86/fixed_dsp.o \
+ x86/float_dsp.o \
+ x86/imgutils.o \
+ x86/lls.o \
+ x86/tx_float.o \
X86ASM-OBJS-$(CONFIG_PIXELUTILS) += x86/pixelutils.o \
diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c
index 1a592f3bf4..5563f6cc3b 100644
--- a/libavutil/x86/cpu.c
+++ b/libavutil/x86/cpu.c
@@ -121,6 +121,8 @@ int ff_get_cpu_flags_x86(void)
rval |= AV_CPU_FLAG_SSE2;
if (ecx & 1)
rval |= AV_CPU_FLAG_SSE3;
+ if (ecx & 0x2)
+ rval |= AV_CPU_FLAG_CLMUL;
if (ecx & 0x00000200 )
rval |= AV_CPU_FLAG_SSSE3;
if (ecx & 0x00080000 )
diff --git a/libavutil/x86/cpu.h b/libavutil/x86/cpu.h
index 00e82255b1..af081b2ed8 100644
--- a/libavutil/x86/cpu.h
+++ b/libavutil/x86/cpu.h
@@ -44,6 +44,7 @@
#define X86_FMA4(flags) CPUEXT(flags, FMA4)
#define X86_AVX2(flags) CPUEXT(flags, AVX2)
#define X86_AESNI(flags) CPUEXT(flags, AESNI)
+#define X86_CLMUL(flags) CPUEXT(flags, CLMUL)
#define X86_AVX512(flags) CPUEXT(flags, AVX512)
#define EXTERNAL_MMX(flags) CPUEXT_SUFFIX(flags, _EXTERNAL, MMX)
@@ -72,6 +73,7 @@
#define EXTERNAL_AVX2_FAST(flags) CPUEXT_SUFFIX_FAST2(flags, _EXTERNAL, AVX2, AVX)
#define EXTERNAL_AVX2_SLOW(flags) CPUEXT_SUFFIX_SLOW2(flags, _EXTERNAL, AVX2, AVX)
#define EXTERNAL_AESNI(flags) CPUEXT_SUFFIX(flags, _EXTERNAL, AESNI)
+#define EXTERNAL_CLMUL(flags) CPUEXT_SUFFIX(flags, _EXTERNAL, CLMUL)
#define EXTERNAL_AVX512(flags) CPUEXT_SUFFIX(flags, _EXTERNAL, AVX512)
#define EXTERNAL_AVX512ICL(flags) CPUEXT_SUFFIX(flags, _EXTERNAL, AVX512ICL)
diff --git a/libavutil/x86/crc.asm b/libavutil/x86/crc.asm
new file mode 100644
index 0000000000..89b2becc8d
--- /dev/null
+++ b/libavutil/x86/crc.asm
@@ -0,0 +1,297 @@
+;*****************************************************************************
+;* Copyright (c) 2025 Shreesh Adiga <16567adigashreesh@gmail.com>
+;*
+;* 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
+;******************************************************************************
+
+%include "x86util.asm"
+
+SECTION RODATA
+reverse_shuffle: db 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+
+partial_bytes_shuf_tab: db 255, 254, 253, 252, 251, 250, 249, 248,\
+ 247, 246, 245, 244, 243, 242, 241, 240,\
+ 0, 1, 2, 3, 4, 5, 6, 7,\
+ 8, 9, 10, 11, 12, 13, 14, 15
+
+SECTION .text
+
+%macro FOLD_128_TO_64 4
+; %1 LE ; %2 128 bit fold reg ; %3 pre-computed constant reg ; %4 tmp reg
+%if %1 == 1
+ mova %4, %2
+ pclmulqdq %2, %3, 0x00
+ psrldq %4, 8
+ pxor %2, %4
+ mova %4, %2
+ psllq %4, 32
+ pclmulqdq %4, %3, 0x10
+ pxor %2, %4
+%else
+ movq %4, %2
+ pclmulqdq %2, %3, 0x11
+ pslldq %4, 4
+ pxor %4, %2
+ mova %2, %4
+ pclmulqdq %4, %3, 0x01
+ pxor %2, %4
+%endif
+%endmacro
+
+%macro FOLD_64_TO_32 4
+; %1 LE ; %2 128 bit fold reg ; %3 pre-computed constant reg ; %4 tmp reg
+%if %1 == 1
+ pxor %4, %4
+ pblendw %4, %2, 0xfc
+ mova %2, %4
+ pclmulqdq %4, %3, 0x00
+ pxor %4, %2
+ pclmulqdq %4, %3, 0x10
+ pxor %2, %4
+ pextrd eax, %2, 2
+%else
+ mova %4, %2
+ pclmulqdq %2, %3, 0x00
+ pclmulqdq %2, %3, 0x11
+ pxor %2, %4
+ movd eax, %2
+ bswap eax
+%endif
+%endmacro
+
+%macro FOLD_SINGLE 4
+; %1 temp ; %2 fold reg ; %3 pre-computed constants ; %4 input data block
+ mova %1, %2
+ pclmulqdq %1, %3, 0x01
+ pxor %1, %4
+ pclmulqdq %2, %3, 0x10
+ pxor %2, %1
+%endmacro
+
+%macro XMM_SHIFT_LEFT 4
+; %1 xmm input reg ; %2 shift bytes amount ; %3 temp xmm register ; %4 temp gpr
+ lea %4, [partial_bytes_shuf_tab]
+ movu %3, [%4 + 16 - (%2)]
+ pshufb %1, %3
+%endmacro
+
+%macro MEMCPY_0_15 6
+; %1 dst ; %2 src ; %3 len ; %4, %5 temp gpr register; %6 done label
+ cmp %3, 8
+ jae .between_8_15
+ cmp %3, 4
+ jae .between_4_7
+ cmp %3, 1
+ ja .between_2_3
+ jb %6
+ mov %4b, [%2]
+ mov [%1], %4b
+ jmp %6
+
+.between_8_15:
+%if ARCH_X86_64
+ mov %4q, [%2]
+ mov %5q, [%2 + %3 - 8]
+ mov [%1], %4q
+ mov [%1 + %3 - 8], %5q
+ jmp %6
+%else
+ xor %5, %5
+.copy4b:
+ mov %4d, [%2 + %5]
+ mov [%1 + %5], %4d
+ add %5, 4
+ lea %4, [%5 + 4]
+ cmp %4, %3
+ jb .copy4b
+
+ mov %4d, [%2 + %3 - 4]
+ mov [%1 + %3 - 4], %4d
+ jmp %6
+%endif
+.between_4_7:
+ mov %4d, [%2]
+ mov %5d, [%2 + %3 - 4]
+ mov [%1], %4d
+ mov [%1 + %3 - 4], %5d
+ jmp %6
+.between_2_3:
+ mov %4w, [%2]
+ mov %5w, [%2 + %3 - 2]
+ mov [%1], %4w
+ mov [%1 + %3 - 2], %5w
+ ; fall through, %6 label is expected to be next instruction
+%endmacro
+
+%macro CRC 1
+;-----------------------------------------------------------------------------------------------
+; ff_av_crc[_le]_clmul(const uint8_t *ctx, uint32_t crc, const uint8_t *buffer, size_t length
+;-----------------------------------------------------------------------------------------------
+; %1 == 1 - LE format
+%if %1 == 1
+cglobal av_crc_le, 4, 6, 7+4*ARCH_X86_64, 0x10
+%else
+cglobal av_crc, 4, 6, 6+4*ARCH_X86_64, 0x10
+%endif
+
+%if ARCH_X86_32
+ %define m10 m6
+%endif
+
+%if %1 == 0
+ movu m10, [reverse_shuffle]
+%endif
+
+ movd m4, r1d
+%if ARCH_X86_32
+ ; skip 4x unrolled loop due to only 8 XMM reg being available in X86_32
+ jmp .less_than_64bytes
+%else
+ cmp r3, 64
+ jb .less_than_64bytes
+ movu m1, [r2 + 0]
+ movu m3, [r2 + 16]
+ movu m2, [r2 + 32]
+ movu m0, [r2 + 48]
+ pxor m1, m4
+%if %1 == 0
+ pshufb m0, m10
+ pshufb m1, m10
+ pshufb m2, m10
+ pshufb m3, m10
+%endif
+ mov r4, 64
+ cmp r3, 128
+ jb .reduce_4x_to_1
+ movu m4, [r0]
+
+.fold_4x_loop:
+ movu m6, [r2 + r4 + 0]
+ movu m7, [r2 + r4 + 16]
+ movu m8, [r2 + r4 + 32]
+ movu m9, [r2 + r4 + 48]
+%if %1 == 0
+ pshufb m6, m10
+ pshufb m7, m10
+ pshufb m8, m10
+ pshufb m9, m10
+%endif
+ FOLD_SINGLE m5, m1, m4, m6
+ FOLD_SINGLE m5, m3, m4, m7
+ FOLD_SINGLE m5, m2, m4, m8
+ FOLD_SINGLE m5, m0, m4, m9
+ add r4, 64
+ lea r5, [r4 + 64]
+ cmp r5, r3
+ jbe .fold_4x_loop
+
+.reduce_4x_to_1:
+ movu m4, [r0 + 16]
+ FOLD_SINGLE m5, m1, m4, m3
+ FOLD_SINGLE m5, m1, m4, m2
+ FOLD_SINGLE m5, m1, m4, m0
+%endif
+
+.fold_1x_pre:
+ lea r5, [r4 + 16]
+ cmp r5, r3
+ ja .partial_block
+
+.fold_1x_loop:
+ movu m2, [r2 + r4]
+%if %1 == 0
+ pshufb m2, m10
+%endif
+ FOLD_SINGLE m5, m1, m4, m2
+ add r4, 16
+ lea r5, [r4 + 16]
+ cmp r5, r3
+ jbe .fold_1x_loop
+
+.partial_block:
+ cmp r4, r3
+ jae .reduce_128_to_64
+ movu m2, [r2 + r3 - 16]
+ and r3, 0xf
+ lea r4, [partial_bytes_shuf_tab]
+ movu m0, [r3 + r4]
+%if %1 == 0
+ pshufb m1, m10
+%endif
+ mova m3, m1
+ pcmpeqd m5, m5 ; m5 = _mm_set1_epi8(0xff)
+ pxor m5, m0
+ pshufb m3, m5
+ pblendvb m2, m3, m0
+ pshufb m1, m0
+%if %1 == 0
+ pshufb m1, m10
+ pshufb m2, m10
+%endif
+ FOLD_SINGLE m5, m1, m4, m2
+
+.reduce_128_to_64:
+ movu m4, [r0 + 32]
+ FOLD_128_TO_64 %1, m1, m4, m5
+.reduce_64_to_32:
+ movu m4, [r0 + 48]
+ FOLD_64_TO_32 %1, m1, m4, m5
+ RET
+
+.less_than_64bytes:
+ cmp r3, 16
+ jb .less_than_16bytes
+ movu m1, [r2]
+ pxor m1, m4
+%if %1 == 0
+ pshufb m1, m10
+%endif
+ mov r4, 16
+ movu m4, [r0 + 16]
+ jmp .fold_1x_pre
+
+.less_than_16bytes:
+ pxor m1, m1
+ movu [rsp], m1
+ MEMCPY_0_15 rsp, r2, r3, r1, r4, .memcpy_done
+
+.memcpy_done:
+ movu m1, [rsp]
+ pxor m1, m4
+ cmp r3, 5
+ jb .less_than_5bytes
+ XMM_SHIFT_LEFT m1, (16 - r3), m2, r4
+%if %1 == 0
+ pshufb m1, m10
+%endif
+ jmp .reduce_128_to_64
+
+.less_than_5bytes:
+%if %1 == 0
+ XMM_SHIFT_LEFT m1, (4 - r3), m2, r4
+ movq m10, [reverse_shuffle + 8] ; 0x0001020304050607
+ pshufb m1, m10
+%else
+ XMM_SHIFT_LEFT m1, (8 - r3), m2, r4
+%endif
+ jmp .reduce_64_to_32
+
+%endmacro
+
+INIT_XMM clmul
+CRC 0
+CRC 1
diff --git a/libavutil/x86/crc.h b/libavutil/x86/crc.h
new file mode 100644
index 0000000000..0cb00fe567
--- /dev/null
+++ b/libavutil/x86/crc.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2025 Shreesh Adiga <16567adigashreesh@gmail.com>
+ *
+ * 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 AVUTIL_X86_CRC_H
+#define AVUTIL_X86_CRC_H
+
+#include "libavutil/crc.h"
+
+extern const AVCRC *(*av_crc_get_table_func)(AVCRCId crc_id);
+extern uint32_t (*av_crc_func)(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length);
+extern int (*av_crc_init_func)(AVCRC *ctx, int le, int bits,
+ uint32_t poly, int ctx_size);
+
+uint32_t ff_av_crc_clmul(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length);
+uint32_t ff_av_crc_le_clmul(const AVCRC *ctx, uint32_t crc,
+ const uint8_t *buffer, size_t length);
+void av_crc_init_x86(void);
+void av_crc_init_fn(void);
+
+#endif /* AVUTIL_X86_CRC_H */
diff --git a/libavutil/x86/crc_init.c b/libavutil/x86/crc_init.c
new file mode 100644
index 0000000000..37998954a6
--- /dev/null
+++ b/libavutil/x86/crc_init.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2025 Shreesh Adiga <16567adigashreesh@gmail.com>
+ *
+ * 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
+ */
+
+#include <stdint.h>
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/avassert.h"
+#include "libavutil/cpu.h"
+#include "libavutil/crc.h"
+#include "libavutil/thread.h"
+#include "libavutil/x86/cpu.h"
+#include "libavutil/x86/crc.h"
+
+static int av_crc_init_clmul(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
+#if CONFIG_HARDCODED_TABLES
+static const AVCRC av_crc_table_clmul[AV_CRC_MAX][16] = {
+ [AV_CRC_8_ATM] = {
+ 0x32000000, 0x0, 0xbc000000, 0x0,
+ 0xc4000000, 0x0, 0x94000000, 0x0,
+ 0x62000000, 0x0, 0x79000000, 0x0,
+ 0x07156a16, 0x1, 0x07000000, 0x1,
+ },
+ [AV_CRC_8_EBU] = {
+ 0xb5000000, 0x0, 0xf3000000, 0x0,
+ 0xfc000000, 0x0, 0x0d000000, 0x0,
+ 0x6a000000, 0x0, 0x65000000, 0x0,
+ 0x1c4b8192, 0x1, 0x1d000000, 0x1,
+ },
+ [AV_CRC_16_ANSI] = {
+ 0xf9e30000, 0x0, 0x807d0000, 0x0,
+ 0xf9130000, 0x0, 0xff830000, 0x0,
+ 0x807b0000, 0x0, 0x86630000, 0x0,
+ 0xfffbffe7, 0x1, 0x80050000, 0x1,
+ },
+ [AV_CRC_16_CCITT] = {
+ 0x60190000, 0x0, 0x59b00000, 0x0,
+ 0xd5f60000, 0x0, 0x45630000, 0x0,
+ 0xaa510000, 0x0, 0xeb230000, 0x0,
+ 0x11303471, 0x1, 0x10210000, 0x1,
+ },
+ [AV_CRC_24_IEEE] = {
+ 0x1f428700, 0x0, 0x467d2400, 0x0,
+ 0x2c8c9d00, 0x0, 0x64e4d700, 0x0,
+ 0xd9fe8c00, 0x0, 0xfd7e0c00, 0x0,
+ 0xf845fe24, 0x1, 0x864cfb00, 0x1,
+ },
+ [AV_CRC_32_IEEE] = {
+ 0x8833794c, 0x0, 0xe6228b11, 0x0,
+ 0xc5b9cd4c, 0x0, 0xe8a45605, 0x0,
+ 0x490d678d, 0x0, 0xf200aa66, 0x0,
+ 0x04d101df, 0x1, 0x04c11db7, 0x1,
+ },
+ [AV_CRC_32_IEEE_LE] = {
+ 0xc6e41596, 0x1, 0x54442bd4, 0x1,
+ 0xccaa009e, 0x0, 0x751997d0, 0x1,
+ 0xccaa009e, 0x0, 0x63cd6124, 0x1,
+ 0xf7011640, 0x1, 0xdb710641, 0x1,
+ },
+ [AV_CRC_16_ANSI_LE] = {
+ 0x0000bffa, 0x0, 0x1b0c2, 0x0,
+ 0x00018cc2, 0x0, 0x1d0c2, 0x0,
+ 0x00018cc2, 0x0, 0x1bc02, 0x0,
+ 0xcfffbffe, 0x1, 0x14003, 0x0,
+ },
+};
+#else
+static AVCRC av_crc_table_clmul[AV_CRC_MAX][16];
+
+#define DECLARE_CRC_INIT_TABLE_ONCE(id, le, bits, poly) \
+static AVOnce id ## _once_control = AV_ONCE_INIT; \
+static void id ## _init_table_once(void) \
+{ \
+ av_assert0(av_crc_init_clmul(av_crc_table_clmul[id], le, bits, poly, sizeof(av_crc_table_clmul[id])) >= 0); \
+}
+
+#define CRC_INIT_TABLE_ONCE(id) ff_thread_once(&id ## _once_control, id ## _init_table_once)
+
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_8_ATM, 0, 8, 0x07)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_8_EBU, 0, 8, 0x1D)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_16_ANSI, 0, 16, 0x8005)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_16_CCITT, 0, 16, 0x1021)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_24_IEEE, 0, 24, 0x864CFB)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_32_IEEE, 0, 32, 0x04C11DB7)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_32_IEEE_LE, 1, 32, 0xEDB88320)
+DECLARE_CRC_INIT_TABLE_ONCE(AV_CRC_16_ANSI_LE, 1, 16, 0xA001)
+#endif
+
+static uint32_t av_crc_clmul(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
+{
+ if (ctx[4] == ctx[8]) {
+ return ff_av_crc_le_clmul(ctx, crc, buffer, length);
+ } else {
+ return ff_av_crc_clmul(ctx, crc, buffer, length);
+ }
+}
+
+static const AVCRC *av_crc_get_table_clmul(AVCRCId crc_id)
+{
+#if !CONFIG_HARDCODED_TABLES
+ switch (crc_id) {
+ case AV_CRC_8_ATM: CRC_INIT_TABLE_ONCE(AV_CRC_8_ATM); break;
+ case AV_CRC_8_EBU: CRC_INIT_TABLE_ONCE(AV_CRC_8_EBU); break;
+ case AV_CRC_16_ANSI: CRC_INIT_TABLE_ONCE(AV_CRC_16_ANSI); break;
+ case AV_CRC_16_CCITT: CRC_INIT_TABLE_ONCE(AV_CRC_16_CCITT); break;
+ case AV_CRC_24_IEEE: CRC_INIT_TABLE_ONCE(AV_CRC_24_IEEE); break;
+ case AV_CRC_32_IEEE: CRC_INIT_TABLE_ONCE(AV_CRC_32_IEEE); break;
+ case AV_CRC_32_IEEE_LE: CRC_INIT_TABLE_ONCE(AV_CRC_32_IEEE_LE); break;
+ case AV_CRC_16_ANSI_LE: CRC_INIT_TABLE_ONCE(AV_CRC_16_ANSI_LE); break;
+ default: av_assert0(0);
+ }
+#endif
+ return av_crc_table_clmul[crc_id];
+}
+
+static uint64_t reverse(uint64_t p, unsigned int deg) {
+ uint64_t ret = 0;
+ for (int i = 0; i < (deg + 1); i++) {
+ ret = (ret << 1) | (p & 1);
+ p >>= 1;
+ }
+ return ret;
+}
+
+static uint64_t xnmodp(unsigned n, uint64_t poly, unsigned deg, uint64_t *div, int bitreverse)
+{
+ uint64_t mod, mask, high;
+
+ if (n < deg) {
+ *div = 0;
+ return poly;
+ }
+ mask = ((uint64_t)1 << deg) - 1;
+ poly &= mask;
+ mod = poly;
+ *div = 1;
+ deg--;
+ while (--n > deg) {
+ high = (mod >> deg) & 1;
+ *div = (*div << 1) | high;
+ mod <<= 1;
+ if (high)
+ mod ^= poly;
+ }
+ uint64_t ret = mod & mask;
+ if (bitreverse) {
+ *div = reverse(*div, deg) << 1;
+ return reverse(ret, deg) << 1;
+ }
+ return ret;
+}
+
+static int av_crc_init_clmul(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
+{
+ if (bits < 8 || bits > 32 || poly >= (1LL << bits))
+ return AVERROR(EINVAL);
+ if (ctx_size < sizeof(AVCRC) * 16)
+ return AVERROR(EINVAL);
+
+ uint64_t poly_;
+ if (le) {
+ // convert the reversed representation to regular form
+ poly = reverse(poly, bits) >> 1;
+ }
+ // convert to 32 degree polynomial
+ poly_ = ((uint64_t)poly) << (32 - bits);
+
+ uint64_t x1, x2, x3, x4, x5, x6, x7, x8, div;
+ if (le) {
+ x1 = xnmodp(4 * 128 - 32, poly_, 32, &div, le);
+ x2 = xnmodp(4 * 128 + 32, poly_, 32, &div, le);
+ x3 = xnmodp(128 - 32, poly_, 32, &div, le);
+ x4 = xnmodp(128 + 32, poly_, 32, &div, le);
+ x5 = x3;
+ x6 = xnmodp(64, poly_, 32, &div, le);
+ x7 = div;
+ x8 = reverse(poly_ | (1ULL << 32), 32);
+ } else {
+ x1 = xnmodp(4 * 128 + 64, poly_, 32, &div, le);
+ x2 = xnmodp(4 * 128, poly_, 32, &div, le);
+ x3 = xnmodp(128 + 64, poly_, 32, &div, le);
+ x4 = xnmodp(128, poly_, 32, &div, le);
+ x5 = xnmodp(64, poly_, 32, &div, le);
+ x7 = div;
+ x6 = xnmodp(96, poly_, 32, &div, le);
+ x8 = poly_ | (1ULL << 32);
+ }
+ ctx[0] = (AVCRC)x1;
+ ctx[1] = (AVCRC)(x1 >> 32);
+ ctx[2] = (AVCRC)x2;
+ ctx[3] = (AVCRC)(x2 >> 32);
+ ctx[4] = (AVCRC)x3;
+ ctx[5] = (AVCRC)(x3 >> 32);
+ ctx[6] = (AVCRC)x4;
+ ctx[7] = (AVCRC)(x4 >> 32);
+ ctx[8] = (AVCRC)x5;
+ ctx[9] = (AVCRC)(x5 >> 32);
+ ctx[10] = (AVCRC)x6;
+ ctx[11] = (AVCRC)(x6 >> 32);
+ ctx[12] = (AVCRC)x7;
+ ctx[13] = (AVCRC)(x7 >> 32);
+ ctx[14] = (AVCRC)x8;
+ ctx[15] = (AVCRC)(x8 >> 32);
+ return 0;
+}
+
+av_cold void av_crc_init_x86(void)
+{
+ int cpu_flags = av_get_cpu_flags();
+
+ if (EXTERNAL_CLMUL(cpu_flags)) {
+ av_crc_func = av_crc_clmul;
+ av_crc_get_table_func = av_crc_get_table_clmul;
+ av_crc_init_func = av_crc_init_clmul;
+ }
+}
diff --git a/tests/checkasm/Makefile b/tests/checkasm/Makefile
index e47070d90f..08d734efb8 100644
--- a/tests/checkasm/Makefile
+++ b/tests/checkasm/Makefile
@@ -87,6 +87,7 @@ CHECKASMOBJS-$(CONFIG_SWSCALE) += $(SWSCALEOBJS)
# libavutil tests
AVUTILOBJS += aes.o
AVUTILOBJS += av_tx.o
+AVUTILOBJS += crc.o
AVUTILOBJS += fixed_dsp.o
AVUTILOBJS += float_dsp.o
AVUTILOBJS += lls.o
diff --git a/tests/checkasm/checkasm.c b/tests/checkasm/checkasm.c
index 4469e043f5..05ffabc054 100644
--- a/tests/checkasm/checkasm.c
+++ b/tests/checkasm/checkasm.c
@@ -327,6 +327,7 @@ static const struct {
#endif
#if CONFIG_AVUTIL
{ "aes", checkasm_check_aes },
+ { "crc", checkasm_check_crc },
{ "fixed_dsp", checkasm_check_fixed_dsp },
{ "float_dsp", checkasm_check_float_dsp },
{ "lls", checkasm_check_lls },
@@ -385,6 +386,7 @@ static const struct {
{ "SSE4.1", "sse4", AV_CPU_FLAG_SSE4 },
{ "SSE4.2", "sse42", AV_CPU_FLAG_SSE42 },
{ "AES-NI", "aesni", AV_CPU_FLAG_AESNI },
+ { "CLMUL", "clmul", AV_CPU_FLAG_CLMUL },
{ "AVX", "avx", AV_CPU_FLAG_AVX },
{ "XOP", "xop", AV_CPU_FLAG_XOP },
{ "FMA3", "fma3", AV_CPU_FLAG_FMA3 },
diff --git a/tests/checkasm/checkasm.h b/tests/checkasm/checkasm.h
index e1ccd4011b..7ad705e28e 100644
--- a/tests/checkasm/checkasm.h
+++ b/tests/checkasm/checkasm.h
@@ -93,6 +93,7 @@ void checkasm_check_bswapdsp(void);
void checkasm_check_cavsdsp(void);
void checkasm_check_colordetect(void);
void checkasm_check_colorspace(void);
+void checkasm_check_crc(void);
void checkasm_check_dcadsp(void);
void checkasm_check_diracdsp(void);
void checkasm_check_exrdsp(void);
diff --git a/tests/checkasm/crc.c b/tests/checkasm/crc.c
new file mode 100644
index 0000000000..9544210b63
--- /dev/null
+++ b/tests/checkasm/crc.c
@@ -0,0 +1,386 @@
+/*
+ * Copyright (c) 2025 Shreesh Adiga <16567adigashreesh@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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.
+ */
+
+#include "checkasm.h"
+#include "libavutil/crc.h"
+#include "libavutil/mem_internal.h"
+#include "libavutil/x86/crc.h"
+
+#define BUF_SIZE (8192 + 11)
+
+static const AVCRC av_crc_table_ref[AV_CRC_MAX][257] = {
+ [AV_CRC_8_ATM] = {
+ 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31,
+ 0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
+ 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9,
+ 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
+ 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1,
+ 0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
+ 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE,
+ 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
+ 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16,
+ 0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
+ 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80,
+ 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
+ 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8,
+ 0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
+ 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10,
+ 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
+ 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F,
+ 0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
+ 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7,
+ 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
+ 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF,
+ 0xFA, 0xFD, 0xF4, 0xF3, 0x01
+ },
+ [AV_CRC_8_EBU] = {
+ 0x00, 0x1D, 0x3A, 0x27, 0x74, 0x69, 0x4E, 0x53, 0xE8, 0xF5, 0xD2, 0xCF,
+ 0x9C, 0x81, 0xA6, 0xBB, 0xCD, 0xD0, 0xF7, 0xEA, 0xB9, 0xA4, 0x83, 0x9E,
+ 0x25, 0x38, 0x1F, 0x02, 0x51, 0x4C, 0x6B, 0x76, 0x87, 0x9A, 0xBD, 0xA0,
+ 0xF3, 0xEE, 0xC9, 0xD4, 0x6F, 0x72, 0x55, 0x48, 0x1B, 0x06, 0x21, 0x3C,
+ 0x4A, 0x57, 0x70, 0x6D, 0x3E, 0x23, 0x04, 0x19, 0xA2, 0xBF, 0x98, 0x85,
+ 0xD6, 0xCB, 0xEC, 0xF1, 0x13, 0x0E, 0x29, 0x34, 0x67, 0x7A, 0x5D, 0x40,
+ 0xFB, 0xE6, 0xC1, 0xDC, 0x8F, 0x92, 0xB5, 0xA8, 0xDE, 0xC3, 0xE4, 0xF9,
+ 0xAA, 0xB7, 0x90, 0x8D, 0x36, 0x2B, 0x0C, 0x11, 0x42, 0x5F, 0x78, 0x65,
+ 0x94, 0x89, 0xAE, 0xB3, 0xE0, 0xFD, 0xDA, 0xC7, 0x7C, 0x61, 0x46, 0x5B,
+ 0x08, 0x15, 0x32, 0x2F, 0x59, 0x44, 0x63, 0x7E, 0x2D, 0x30, 0x17, 0x0A,
+ 0xB1, 0xAC, 0x8B, 0x96, 0xC5, 0xD8, 0xFF, 0xE2, 0x26, 0x3B, 0x1C, 0x01,
+ 0x52, 0x4F, 0x68, 0x75, 0xCE, 0xD3, 0xF4, 0xE9, 0xBA, 0xA7, 0x80, 0x9D,
+ 0xEB, 0xF6, 0xD1, 0xCC, 0x9F, 0x82, 0xA5, 0xB8, 0x03, 0x1E, 0x39, 0x24,
+ 0x77, 0x6A, 0x4D, 0x50, 0xA1, 0xBC, 0x9B, 0x86, 0xD5, 0xC8, 0xEF, 0xF2,
+ 0x49, 0x54, 0x73, 0x6E, 0x3D, 0x20, 0x07, 0x1A, 0x6C, 0x71, 0x56, 0x4B,
+ 0x18, 0x05, 0x22, 0x3F, 0x84, 0x99, 0xBE, 0xA3, 0xF0, 0xED, 0xCA, 0xD7,
+ 0x35, 0x28, 0x0F, 0x12, 0x41, 0x5C, 0x7B, 0x66, 0xDD, 0xC0, 0xE7, 0xFA,
+ 0xA9, 0xB4, 0x93, 0x8E, 0xF8, 0xE5, 0xC2, 0xDF, 0x8C, 0x91, 0xB6, 0xAB,
+ 0x10, 0x0D, 0x2A, 0x37, 0x64, 0x79, 0x5E, 0x43, 0xB2, 0xAF, 0x88, 0x95,
+ 0xC6, 0xDB, 0xFC, 0xE1, 0x5A, 0x47, 0x60, 0x7D, 0x2E, 0x33, 0x14, 0x09,
+ 0x7F, 0x62, 0x45, 0x58, 0x0B, 0x16, 0x31, 0x2C, 0x97, 0x8A, 0xAD, 0xB0,
+ 0xE3, 0xFE, 0xD9, 0xC4, 0x01
+ },
+ [AV_CRC_16_ANSI] = {
+ 0x0000, 0x0580, 0x0F80, 0x0A00, 0x1B80, 0x1E00, 0x1400, 0x1180,
+ 0x3380, 0x3600, 0x3C00, 0x3980, 0x2800, 0x2D80, 0x2780, 0x2200,
+ 0x6380, 0x6600, 0x6C00, 0x6980, 0x7800, 0x7D80, 0x7780, 0x7200,
+ 0x5000, 0x5580, 0x5F80, 0x5A00, 0x4B80, 0x4E00, 0x4400, 0x4180,
+ 0xC380, 0xC600, 0xCC00, 0xC980, 0xD800, 0xDD80, 0xD780, 0xD200,
+ 0xF000, 0xF580, 0xFF80, 0xFA00, 0xEB80, 0xEE00, 0xE400, 0xE180,
+ 0xA000, 0xA580, 0xAF80, 0xAA00, 0xBB80, 0xBE00, 0xB400, 0xB180,
+ 0x9380, 0x9600, 0x9C00, 0x9980, 0x8800, 0x8D80, 0x8780, 0x8200,
+ 0x8381, 0x8601, 0x8C01, 0x8981, 0x9801, 0x9D81, 0x9781, 0x9201,
+ 0xB001, 0xB581, 0xBF81, 0xBA01, 0xAB81, 0xAE01, 0xA401, 0xA181,
+ 0xE001, 0xE581, 0xEF81, 0xEA01, 0xFB81, 0xFE01, 0xF401, 0xF181,
+ 0xD381, 0xD601, 0xDC01, 0xD981, 0xC801, 0xCD81, 0xC781, 0xC201,
+ 0x4001, 0x4581, 0x4F81, 0x4A01, 0x5B81, 0x5E01, 0x5401, 0x5181,
+ 0x7381, 0x7601, 0x7C01, 0x7981, 0x6801, 0x6D81, 0x6781, 0x6201,
+ 0x2381, 0x2601, 0x2C01, 0x2981, 0x3801, 0x3D81, 0x3781, 0x3201,
+ 0x1001, 0x1581, 0x1F81, 0x1A01, 0x0B81, 0x0E01, 0x0401, 0x0181,
+ 0x0383, 0x0603, 0x0C03, 0x0983, 0x1803, 0x1D83, 0x1783, 0x1203,
+ 0x3003, 0x3583, 0x3F83, 0x3A03, 0x2B83, 0x2E03, 0x2403, 0x2183,
+ 0x6003, 0x6583, 0x6F83, 0x6A03, 0x7B83, 0x7E03, 0x7403, 0x7183,
+ 0x5383, 0x5603, 0x5C03, 0x5983, 0x4803, 0x4D83, 0x4783, 0x4203,
+ 0xC003, 0xC583, 0xCF83, 0xCA03, 0xDB83, 0xDE03, 0xD403, 0xD183,
+ 0xF383, 0xF603, 0xFC03, 0xF983, 0xE803, 0xED83, 0xE783, 0xE203,
+ 0xA383, 0xA603, 0xAC03, 0xA983, 0xB803, 0xBD83, 0xB783, 0xB203,
+ 0x9003, 0x9583, 0x9F83, 0x9A03, 0x8B83, 0x8E03, 0x8403, 0x8183,
+ 0x8002, 0x8582, 0x8F82, 0x8A02, 0x9B82, 0x9E02, 0x9402, 0x9182,
+ 0xB382, 0xB602, 0xBC02, 0xB982, 0xA802, 0xAD82, 0xA782, 0xA202,
+ 0xE382, 0xE602, 0xEC02, 0xE982, 0xF802, 0xFD82, 0xF782, 0xF202,
+ 0xD002, 0xD582, 0xDF82, 0xDA02, 0xCB82, 0xCE02, 0xC402, 0xC182,
+ 0x4382, 0x4602, 0x4C02, 0x4982, 0x5802, 0x5D82, 0x5782, 0x5202,
+ 0x7002, 0x7582, 0x7F82, 0x7A02, 0x6B82, 0x6E02, 0x6402, 0x6182,
+ 0x2002, 0x2582, 0x2F82, 0x2A02, 0x3B82, 0x3E02, 0x3402, 0x3182,
+ 0x1382, 0x1602, 0x1C02, 0x1982, 0x0802, 0x0D82, 0x0782, 0x0202,
+ 0x0001
+ },
+ [AV_CRC_16_CCITT] = {
+ 0x0000, 0x2110, 0x4220, 0x6330, 0x8440, 0xA550, 0xC660, 0xE770,
+ 0x0881, 0x2991, 0x4AA1, 0x6BB1, 0x8CC1, 0xADD1, 0xCEE1, 0xEFF1,
+ 0x3112, 0x1002, 0x7332, 0x5222, 0xB552, 0x9442, 0xF772, 0xD662,
+ 0x3993, 0x1883, 0x7BB3, 0x5AA3, 0xBDD3, 0x9CC3, 0xFFF3, 0xDEE3,
+ 0x6224, 0x4334, 0x2004, 0x0114, 0xE664, 0xC774, 0xA444, 0x8554,
+ 0x6AA5, 0x4BB5, 0x2885, 0x0995, 0xEEE5, 0xCFF5, 0xACC5, 0x8DD5,
+ 0x5336, 0x7226, 0x1116, 0x3006, 0xD776, 0xF666, 0x9556, 0xB446,
+ 0x5BB7, 0x7AA7, 0x1997, 0x3887, 0xDFF7, 0xFEE7, 0x9DD7, 0xBCC7,
+ 0xC448, 0xE558, 0x8668, 0xA778, 0x4008, 0x6118, 0x0228, 0x2338,
+ 0xCCC9, 0xEDD9, 0x8EE9, 0xAFF9, 0x4889, 0x6999, 0x0AA9, 0x2BB9,
+ 0xF55A, 0xD44A, 0xB77A, 0x966A, 0x711A, 0x500A, 0x333A, 0x122A,
+ 0xFDDB, 0xDCCB, 0xBFFB, 0x9EEB, 0x799B, 0x588B, 0x3BBB, 0x1AAB,
+ 0xA66C, 0x877C, 0xE44C, 0xC55C, 0x222C, 0x033C, 0x600C, 0x411C,
+ 0xAEED, 0x8FFD, 0xECCD, 0xCDDD, 0x2AAD, 0x0BBD, 0x688D, 0x499D,
+ 0x977E, 0xB66E, 0xD55E, 0xF44E, 0x133E, 0x322E, 0x511E, 0x700E,
+ 0x9FFF, 0xBEEF, 0xDDDF, 0xFCCF, 0x1BBF, 0x3AAF, 0x599F, 0x788F,
+ 0x8891, 0xA981, 0xCAB1, 0xEBA1, 0x0CD1, 0x2DC1, 0x4EF1, 0x6FE1,
+ 0x8010, 0xA100, 0xC230, 0xE320, 0x0450, 0x2540, 0x4670, 0x6760,
+ 0xB983, 0x9893, 0xFBA3, 0xDAB3, 0x3DC3, 0x1CD3, 0x7FE3, 0x5EF3,
+ 0xB102, 0x9012, 0xF322, 0xD232, 0x3542, 0x1452, 0x7762, 0x5672,
+ 0xEAB5, 0xCBA5, 0xA895, 0x8985, 0x6EF5, 0x4FE5, 0x2CD5, 0x0DC5,
+ 0xE234, 0xC324, 0xA014, 0x8104, 0x6674, 0x4764, 0x2454, 0x0544,
+ 0xDBA7, 0xFAB7, 0x9987, 0xB897, 0x5FE7, 0x7EF7, 0x1DC7, 0x3CD7,
+ 0xD326, 0xF236, 0x9106, 0xB016, 0x5766, 0x7676, 0x1546, 0x3456,
+ 0x4CD9, 0x6DC9, 0x0EF9, 0x2FE9, 0xC899, 0xE989, 0x8AB9, 0xABA9,
+ 0x4458, 0x6548, 0x0678, 0x2768, 0xC018, 0xE108, 0x8238, 0xA328,
+ 0x7DCB, 0x5CDB, 0x3FEB, 0x1EFB, 0xF98B, 0xD89B, 0xBBAB, 0x9ABB,
+ 0x754A, 0x545A, 0x376A, 0x167A, 0xF10A, 0xD01A, 0xB32A, 0x923A,
+ 0x2EFD, 0x0FED, 0x6CDD, 0x4DCD, 0xAABD, 0x8BAD, 0xE89D, 0xC98D,
+ 0x267C, 0x076C, 0x645C, 0x454C, 0xA23C, 0x832C, 0xE01C, 0xC10C,
+ 0x1FEF, 0x3EFF, 0x5DCF, 0x7CDF, 0x9BAF, 0xBABF, 0xD98F, 0xF89F,
+ 0x176E, 0x367E, 0x554E, 0x745E, 0x932E, 0xB23E, 0xD10E, 0xF01E,
+ 0x0001
+ },
+ [AV_CRC_24_IEEE] = {
+ 0x000000, 0xFB4C86, 0x0DD58A, 0xF6990C, 0xE1E693, 0x1AAA15, 0xEC3319,
+ 0x177F9F, 0x3981A1, 0xC2CD27, 0x34542B, 0xCF18AD, 0xD86732, 0x232BB4,
+ 0xD5B2B8, 0x2EFE3E, 0x894EC5, 0x720243, 0x849B4F, 0x7FD7C9, 0x68A856,
+ 0x93E4D0, 0x657DDC, 0x9E315A, 0xB0CF64, 0x4B83E2, 0xBD1AEE, 0x465668,
+ 0x5129F7, 0xAA6571, 0x5CFC7D, 0xA7B0FB, 0xE9D10C, 0x129D8A, 0xE40486,
+ 0x1F4800, 0x08379F, 0xF37B19, 0x05E215, 0xFEAE93, 0xD050AD, 0x2B1C2B,
+ 0xDD8527, 0x26C9A1, 0x31B63E, 0xCAFAB8, 0x3C63B4, 0xC72F32, 0x609FC9,
+ 0x9BD34F, 0x6D4A43, 0x9606C5, 0x81795A, 0x7A35DC, 0x8CACD0, 0x77E056,
+ 0x591E68, 0xA252EE, 0x54CBE2, 0xAF8764, 0xB8F8FB, 0x43B47D, 0xB52D71,
+ 0x4E61F7, 0xD2A319, 0x29EF9F, 0xDF7693, 0x243A15, 0x33458A, 0xC8090C,
+ 0x3E9000, 0xC5DC86, 0xEB22B8, 0x106E3E, 0xE6F732, 0x1DBBB4, 0x0AC42B,
+ 0xF188AD, 0x0711A1, 0xFC5D27, 0x5BEDDC, 0xA0A15A, 0x563856, 0xAD74D0,
+ 0xBA0B4F, 0x4147C9, 0xB7DEC5, 0x4C9243, 0x626C7D, 0x9920FB, 0x6FB9F7,
+ 0x94F571, 0x838AEE, 0x78C668, 0x8E5F64, 0x7513E2, 0x3B7215, 0xC03E93,
+ 0x36A79F, 0xCDEB19, 0xDA9486, 0x21D800, 0xD7410C, 0x2C0D8A, 0x02F3B4,
+ 0xF9BF32, 0x0F263E, 0xF46AB8, 0xE31527, 0x1859A1, 0xEEC0AD, 0x158C2B,
+ 0xB23CD0, 0x497056, 0xBFE95A, 0x44A5DC, 0x53DA43, 0xA896C5, 0x5E0FC9,
+ 0xA5434F, 0x8BBD71, 0x70F1F7, 0x8668FB, 0x7D247D, 0x6A5BE2, 0x911764,
+ 0x678E68, 0x9CC2EE, 0xA44733, 0x5F0BB5, 0xA992B9, 0x52DE3F, 0x45A1A0,
+ 0xBEED26, 0x48742A, 0xB338AC, 0x9DC692, 0x668A14, 0x901318, 0x6B5F9E,
+ 0x7C2001, 0x876C87, 0x71F58B, 0x8AB90D, 0x2D09F6, 0xD64570, 0x20DC7C,
+ 0xDB90FA, 0xCCEF65, 0x37A3E3, 0xC13AEF, 0x3A7669, 0x148857, 0xEFC4D1,
+ 0x195DDD, 0xE2115B, 0xF56EC4, 0x0E2242, 0xF8BB4E, 0x03F7C8, 0x4D963F,
+ 0xB6DAB9, 0x4043B5, 0xBB0F33, 0xAC70AC, 0x573C2A, 0xA1A526, 0x5AE9A0,
+ 0x74179E, 0x8F5B18, 0x79C214, 0x828E92, 0x95F10D, 0x6EBD8B, 0x982487,
+ 0x636801, 0xC4D8FA, 0x3F947C, 0xC90D70, 0x3241F6, 0x253E69, 0xDE72EF,
+ 0x28EBE3, 0xD3A765, 0xFD595B, 0x0615DD, 0xF08CD1, 0x0BC057, 0x1CBFC8,
+ 0xE7F34E, 0x116A42, 0xEA26C4, 0x76E42A, 0x8DA8AC, 0x7B31A0, 0x807D26,
+ 0x9702B9, 0x6C4E3F, 0x9AD733, 0x619BB5, 0x4F658B, 0xB4290D, 0x42B001,
+ 0xB9FC87, 0xAE8318, 0x55CF9E, 0xA35692, 0x581A14, 0xFFAAEF, 0x04E669,
+ 0xF27F65, 0x0933E3, 0x1E4C7C, 0xE500FA, 0x1399F6, 0xE8D570, 0xC62B4E,
+ 0x3D67C8, 0xCBFEC4, 0x30B242, 0x27CDDD, 0xDC815B, 0x2A1857, 0xD154D1,
+ 0x9F3526, 0x6479A0, 0x92E0AC, 0x69AC2A, 0x7ED3B5, 0x859F33, 0x73063F,
+ 0x884AB9, 0xA6B487, 0x5DF801, 0xAB610D, 0x502D8B, 0x475214, 0xBC1E92,
+ 0x4A879E, 0xB1CB18, 0x167BE3, 0xED3765, 0x1BAE69, 0xE0E2EF, 0xF79D70,
+ 0x0CD1F6, 0xFA48FA, 0x01047C, 0x2FFA42, 0xD4B6C4, 0x222FC8, 0xD9634E,
+ 0xCE1CD1, 0x355057, 0xC3C95B, 0x3885DD, 0x000001,
+ },
+ [AV_CRC_32_IEEE] = {
+ 0x00000000, 0xB71DC104, 0x6E3B8209, 0xD926430D, 0xDC760413, 0x6B6BC517,
+ 0xB24D861A, 0x0550471E, 0xB8ED0826, 0x0FF0C922, 0xD6D68A2F, 0x61CB4B2B,
+ 0x649B0C35, 0xD386CD31, 0x0AA08E3C, 0xBDBD4F38, 0x70DB114C, 0xC7C6D048,
+ 0x1EE09345, 0xA9FD5241, 0xACAD155F, 0x1BB0D45B, 0xC2969756, 0x758B5652,
+ 0xC836196A, 0x7F2BD86E, 0xA60D9B63, 0x11105A67, 0x14401D79, 0xA35DDC7D,
+ 0x7A7B9F70, 0xCD665E74, 0xE0B62398, 0x57ABE29C, 0x8E8DA191, 0x39906095,
+ 0x3CC0278B, 0x8BDDE68F, 0x52FBA582, 0xE5E66486, 0x585B2BBE, 0xEF46EABA,
+ 0x3660A9B7, 0x817D68B3, 0x842D2FAD, 0x3330EEA9, 0xEA16ADA4, 0x5D0B6CA0,
+ 0x906D32D4, 0x2770F3D0, 0xFE56B0DD, 0x494B71D9, 0x4C1B36C7, 0xFB06F7C3,
+ 0x2220B4CE, 0x953D75CA, 0x28803AF2, 0x9F9DFBF6, 0x46BBB8FB, 0xF1A679FF,
+ 0xF4F63EE1, 0x43EBFFE5, 0x9ACDBCE8, 0x2DD07DEC, 0x77708634, 0xC06D4730,
+ 0x194B043D, 0xAE56C539, 0xAB068227, 0x1C1B4323, 0xC53D002E, 0x7220C12A,
+ 0xCF9D8E12, 0x78804F16, 0xA1A60C1B, 0x16BBCD1F, 0x13EB8A01, 0xA4F64B05,
+ 0x7DD00808, 0xCACDC90C, 0x07AB9778, 0xB0B6567C, 0x69901571, 0xDE8DD475,
+ 0xDBDD936B, 0x6CC0526F, 0xB5E61162, 0x02FBD066, 0xBF469F5E, 0x085B5E5A,
+ 0xD17D1D57, 0x6660DC53, 0x63309B4D, 0xD42D5A49, 0x0D0B1944, 0xBA16D840,
+ 0x97C6A5AC, 0x20DB64A8, 0xF9FD27A5, 0x4EE0E6A1, 0x4BB0A1BF, 0xFCAD60BB,
+ 0x258B23B6, 0x9296E2B2, 0x2F2BAD8A, 0x98366C8E, 0x41102F83, 0xF60DEE87,
+ 0xF35DA999, 0x4440689D, 0x9D662B90, 0x2A7BEA94, 0xE71DB4E0, 0x500075E4,
+ 0x892636E9, 0x3E3BF7ED, 0x3B6BB0F3, 0x8C7671F7, 0x555032FA, 0xE24DF3FE,
+ 0x5FF0BCC6, 0xE8ED7DC2, 0x31CB3ECF, 0x86D6FFCB, 0x8386B8D5, 0x349B79D1,
+ 0xEDBD3ADC, 0x5AA0FBD8, 0xEEE00C69, 0x59FDCD6D, 0x80DB8E60, 0x37C64F64,
+ 0x3296087A, 0x858BC97E, 0x5CAD8A73, 0xEBB04B77, 0x560D044F, 0xE110C54B,
+ 0x38368646, 0x8F2B4742, 0x8A7B005C, 0x3D66C158, 0xE4408255, 0x535D4351,
+ 0x9E3B1D25, 0x2926DC21, 0xF0009F2C, 0x471D5E28, 0x424D1936, 0xF550D832,
+ 0x2C769B3F, 0x9B6B5A3B, 0x26D61503, 0x91CBD407, 0x48ED970A, 0xFFF0560E,
+ 0xFAA01110, 0x4DBDD014, 0x949B9319, 0x2386521D, 0x0E562FF1, 0xB94BEEF5,
+ 0x606DADF8, 0xD7706CFC, 0xD2202BE2, 0x653DEAE6, 0xBC1BA9EB, 0x0B0668EF,
+ 0xB6BB27D7, 0x01A6E6D3, 0xD880A5DE, 0x6F9D64DA, 0x6ACD23C4, 0xDDD0E2C0,
+ 0x04F6A1CD, 0xB3EB60C9, 0x7E8D3EBD, 0xC990FFB9, 0x10B6BCB4, 0xA7AB7DB0,
+ 0xA2FB3AAE, 0x15E6FBAA, 0xCCC0B8A7, 0x7BDD79A3, 0xC660369B, 0x717DF79F,
+ 0xA85BB492, 0x1F467596, 0x1A163288, 0xAD0BF38C, 0x742DB081, 0xC3307185,
+ 0x99908A5D, 0x2E8D4B59, 0xF7AB0854, 0x40B6C950, 0x45E68E4E, 0xF2FB4F4A,
+ 0x2BDD0C47, 0x9CC0CD43, 0x217D827B, 0x9660437F, 0x4F460072, 0xF85BC176,
+ 0xFD0B8668, 0x4A16476C, 0x93300461, 0x242DC565, 0xE94B9B11, 0x5E565A15,
+ 0x87701918, 0x306DD81C, 0x353D9F02, 0x82205E06, 0x5B061D0B, 0xEC1BDC0F,
+ 0x51A69337, 0xE6BB5233, 0x3F9D113E, 0x8880D03A, 0x8DD09724, 0x3ACD5620,
+ 0xE3EB152D, 0x54F6D429, 0x7926A9C5, 0xCE3B68C1, 0x171D2BCC, 0xA000EAC8,
+ 0xA550ADD6, 0x124D6CD2, 0xCB6B2FDF, 0x7C76EEDB, 0xC1CBA1E3, 0x76D660E7,
+ 0xAFF023EA, 0x18EDE2EE, 0x1DBDA5F0, 0xAAA064F4, 0x738627F9, 0xC49BE6FD,
+ 0x09FDB889, 0xBEE0798D, 0x67C63A80, 0xD0DBFB84, 0xD58BBC9A, 0x62967D9E,
+ 0xBBB03E93, 0x0CADFF97, 0xB110B0AF, 0x060D71AB, 0xDF2B32A6, 0x6836F3A2,
+ 0x6D66B4BC, 0xDA7B75B8, 0x035D36B5, 0xB440F7B1, 0x00000001
+ },
+ [AV_CRC_32_IEEE_LE] = {
+ 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
+ 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
+ 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
+ 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+ 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
+ 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
+ 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
+ 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+ 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
+ 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
+ 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
+ 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+ 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
+ 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
+ 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
+ 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+ 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
+ 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
+ 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
+ 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+ 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
+ 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
+ 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
+ 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+ 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
+ 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
+ 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
+ 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+ 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
+ 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
+ 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
+ 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+ 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
+ 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
+ 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
+ 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+ 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
+ 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
+ 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
+ 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+ 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
+ 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
+ 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D, 0x00000001
+ },
+ [AV_CRC_16_ANSI_LE] = {
+ 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
+ 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
+ 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
+ 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
+ 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
+ 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
+ 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
+ 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
+ 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
+ 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
+ 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
+ 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
+ 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
+ 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
+ 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
+ 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
+ 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
+ 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
+ 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
+ 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
+ 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
+ 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
+ 0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
+ 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
+ 0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
+ 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
+ 0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
+ 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
+ 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
+ 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
+ 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
+ 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040,
+ 0x0001
+ },
+};
+
+static const AVCRC *av_crc_get_table_ref(AVCRCId crc_id)
+{
+ return av_crc_table_ref[crc_id];
+}
+
+static uint32_t av_crc_ref(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
+{
+ const uint8_t *end = buffer + length;
+
+ while (buffer < end)
+ crc = ctx[((uint8_t) crc) ^ *buffer++] ^ (crc >> 8);
+
+ return crc;
+}
+
+static void check_crc(void)
+{
+ LOCAL_ALIGNED_32(uint8_t, buf, [BUF_SIZE]);
+
+ for (int i = 0; i < BUF_SIZE; i++)
+ buf[i] = rnd();
+
+ av_crc_init_fn();
+ declare_func(uint32_t, const AVCRC *crctab, uint32_t crc,
+ const uint8_t *buffer, size_t length);
+
+ func_type *fn = av_crc_func;
+ uint32_t crc_arr[] = {
+ 0,
+ 0x12,
+ 0x1234,
+ 0x123456,
+ 0x12345678,
+ 0x12000000,
+ 0x12340000,
+ 0x12345600,
+ UINT32_MAX
+ };
+ AVCRCId crc_id_arr[] = {
+ AV_CRC_8_ATM,
+ AV_CRC_16_ANSI,
+ AV_CRC_16_CCITT,
+ AV_CRC_32_IEEE,
+ AV_CRC_32_IEEE_LE,
+ AV_CRC_16_ANSI_LE,
+ AV_CRC_24_IEEE,
+ AV_CRC_8_EBU,
+ };
+
+ if (check_func(fn, "av_crc")) {
+ for (uint32_t crc_id_idx = 0; crc_id_idx < FF_ARRAY_ELEMS(crc_id_arr); crc_id_idx++) {
+ AVCRCId crc_id = crc_id_arr[crc_id_idx];
+ for (uint32_t crc_idx = 0; crc_idx < FF_ARRAY_ELEMS(crc_arr); crc_idx++) {
+ for (int i = 0; i < 200; i++) {
+ uint32_t crc0 = crc_arr[crc_idx];
+ uint32_t crc1 = crc_arr[crc_idx];
+
+ crc0 = call_new(av_crc_get_table(crc_id), crc0, buf, i);
+ crc1 = av_crc_ref(av_crc_get_table_ref(crc_id), crc1, buf, i);
+ if (crc0 != crc1)
+ fail();
+ }
+ }
+ }
+
+ bench_new(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf, BUF_SIZE);
+ }
+}
+
+void checkasm_check_crc(void)
+{
+ check_crc();
+ report("crc");
+}
--
2.49.1
_______________________________________________
ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org
To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2025-10-25 17:00 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2025-10-25 16:59 [FFmpeg-devel] [PATCH] avutil/crc: add x86 SSE4.2 clmul SIMD implementation for av_crc (PR #20751) Shreesh Adiga via ffmpeg-devel
Git Inbox Mirror of the ffmpeg-devel mailing list - see https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
This inbox may be cloned and mirrored by anyone:
git clone --mirror https://master.gitmailbox.com/ffmpegdev/0 ffmpegdev/git/0.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 ffmpegdev ffmpegdev/ https://master.gitmailbox.com/ffmpegdev \
ffmpegdev@gitmailbox.com
public-inbox-index ffmpegdev
Example config snippet for mirrors.
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git