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/* 7zCrc.c -- CRC32 calculation and init
2024-03-01 : Igor Pavlov : Public domain */
#include "Precomp.h"
#include "7zCrc.h"
#include "CpuArch.h"
// for debug:
// #define __ARM_FEATURE_CRC32 1
#ifdef __ARM_FEATURE_CRC32
// #pragma message("__ARM_FEATURE_CRC32")
#define Z7_CRC_HW_FORCE
#endif
// #define Z7_CRC_DEBUG_BE
#ifdef Z7_CRC_DEBUG_BE
#undef MY_CPU_LE
#define MY_CPU_BE
#endif
#ifdef Z7_CRC_HW_FORCE
#define Z7_CRC_NUM_TABLES_USE 1
#else
#ifdef Z7_CRC_NUM_TABLES
#define Z7_CRC_NUM_TABLES_USE Z7_CRC_NUM_TABLES
#else
#define Z7_CRC_NUM_TABLES_USE 12
#endif
#endif
#if Z7_CRC_NUM_TABLES_USE < 1
#error Stop_Compiling_Bad_Z7_CRC_NUM_TABLES
#endif
#if defined(MY_CPU_LE) || (Z7_CRC_NUM_TABLES_USE == 1)
#define Z7_CRC_NUM_TABLES_TOTAL Z7_CRC_NUM_TABLES_USE
#else
#define Z7_CRC_NUM_TABLES_TOTAL (Z7_CRC_NUM_TABLES_USE + 1)
#endif
#ifndef Z7_CRC_HW_FORCE
#if Z7_CRC_NUM_TABLES_USE == 1 \
|| (!defined(MY_CPU_LE) && !defined(MY_CPU_BE))
#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
#define Z7_CRC_UPDATE_T1_FUNC_NAME CrcUpdateGT1
static UInt32 Z7_FASTCALL Z7_CRC_UPDATE_T1_FUNC_NAME(UInt32 v, const void *data, size_t size)
{
const UInt32 *table = g_CrcTable;
const Byte *p = (const Byte *)data;
const Byte *lim = p + size;
for (; p != lim; p++)
v = CRC_UPDATE_BYTE_2(v, *p);
return v;
}
#endif
#if Z7_CRC_NUM_TABLES_USE != 1
#ifndef MY_CPU_BE
#define FUNC_NAME_LE_2(s) CrcUpdateT ## s
#define FUNC_NAME_LE_1(s) FUNC_NAME_LE_2(s)
#define FUNC_NAME_LE FUNC_NAME_LE_1(Z7_CRC_NUM_TABLES_USE)
UInt32 Z7_FASTCALL FUNC_NAME_LE (UInt32 v, const void *data, size_t size, const UInt32 *table);
#endif
#ifndef MY_CPU_LE
#define FUNC_NAME_BE_2(s) CrcUpdateT1_BeT ## s
#define FUNC_NAME_BE_1(s) FUNC_NAME_BE_2(s)
#define FUNC_NAME_BE FUNC_NAME_BE_1(Z7_CRC_NUM_TABLES_USE)
UInt32 Z7_FASTCALL FUNC_NAME_BE (UInt32 v, const void *data, size_t size, const UInt32 *table);
#endif
#endif
#endif // Z7_CRC_HW_FORCE
/* ---------- hardware CRC ---------- */
#ifdef MY_CPU_LE
#if defined(MY_CPU_ARM_OR_ARM64)
// #pragma message("ARM*")
#if (defined(__clang__) && (__clang_major__ >= 3)) \
|| defined(__GNUC__) && (__GNUC__ >= 6) && defined(MY_CPU_ARM64) \
|| defined(__GNUC__) && (__GNUC__ >= 8)
#if !defined(__ARM_FEATURE_CRC32)
// #pragma message("!defined(__ARM_FEATURE_CRC32)")
Z7_DIAGNOSTIC_IGNORE_BEGIN_RESERVED_MACRO_IDENTIFIER
#define __ARM_FEATURE_CRC32 1
Z7_DIAGNOSTIC_IGNORE_END_RESERVED_MACRO_IDENTIFIER
#define Z7_ARM_FEATURE_CRC32_WAS_SET
#if defined(__clang__)
#if defined(MY_CPU_ARM64)
#define ATTRIB_CRC __attribute__((__target__("crc")))
#else
#define ATTRIB_CRC __attribute__((__target__("armv8-a,crc")))
#endif
#else
#if defined(MY_CPU_ARM64)
#if !defined(Z7_GCC_VERSION) || (Z7_GCC_VERSION >= 60000)
#define ATTRIB_CRC __attribute__((__target__("+crc")))
#endif
#else
#if !defined(Z7_GCC_VERSION) || (__GNUC__ >= 8)
#if defined(__ARM_FP) && __GNUC__ >= 8
// for -mfloat-abi=hard: similar to <arm_acle.h>
#define ATTRIB_CRC __attribute__((__target__("arch=armv8-a+crc+simd")))
#else
#define ATTRIB_CRC __attribute__((__target__("arch=armv8-a+crc")))
#endif
#endif
#endif
#endif
#endif
#if defined(__ARM_FEATURE_CRC32)
// #pragma message("<arm_acle.h>")
/*
arm_acle.h (GGC):
before Nov 17, 2017:
#ifdef __ARM_FEATURE_CRC32
Nov 17, 2017: gcc10.0 (gcc 9.2.0) checked"
#if __ARM_ARCH >= 8
#pragma GCC target ("arch=armv8-a+crc")
Aug 22, 2019: GCC 8.4?, 9.2.1, 10.1:
#ifdef __ARM_FEATURE_CRC32
#ifdef __ARM_FP
#pragma GCC target ("arch=armv8-a+crc+simd")
#else
#pragma GCC target ("arch=armv8-a+crc")
#endif
*/
#if defined(__ARM_ARCH) && __ARM_ARCH < 8
#if defined(Z7_GCC_VERSION) && (__GNUC__ == 8) && (Z7_GCC_VERSION < 80400) \
|| defined(Z7_GCC_VERSION) && (__GNUC__ == 9) && (Z7_GCC_VERSION < 90201) \
|| defined(Z7_GCC_VERSION) && (__GNUC__ == 10) && (Z7_GCC_VERSION < 100100)
Z7_DIAGNOSTIC_IGNORE_BEGIN_RESERVED_MACRO_IDENTIFIER
// #pragma message("#define __ARM_ARCH 8")
#undef __ARM_ARCH
#define __ARM_ARCH 8
Z7_DIAGNOSTIC_IGNORE_END_RESERVED_MACRO_IDENTIFIER
#endif
#endif
#define Z7_CRC_HW_USE
#include <arm_acle.h>
#endif
#elif defined(_MSC_VER)
#if defined(MY_CPU_ARM64)
#if (_MSC_VER >= 1910)
#ifdef __clang__
// #define Z7_CRC_HW_USE
// #include <arm_acle.h>
#else
#define Z7_CRC_HW_USE
#include <intrin.h>
#endif
#endif
#endif
#endif
#else // non-ARM*
// #define Z7_CRC_HW_USE // for debug : we can test HW-branch of code
#ifdef Z7_CRC_HW_USE
#include "7zCrcEmu.h"
#endif
#endif // non-ARM*
#if defined(Z7_CRC_HW_USE)
// #pragma message("USE ARM HW CRC")
#ifdef MY_CPU_64BIT
#define CRC_HW_WORD_TYPE UInt64
#define CRC_HW_WORD_FUNC __crc32d
#else
#define CRC_HW_WORD_TYPE UInt32
#define CRC_HW_WORD_FUNC __crc32w
#endif
#define CRC_HW_UNROLL_BYTES (sizeof(CRC_HW_WORD_TYPE) * 4)
#ifdef ATTRIB_CRC
ATTRIB_CRC
#endif
Z7_NO_INLINE
#ifdef Z7_CRC_HW_FORCE
UInt32 Z7_FASTCALL CrcUpdate
#else
static UInt32 Z7_FASTCALL CrcUpdate_HW
#endif
(UInt32 v, const void *data, size_t size)
{
const Byte *p = (const Byte *)data;
for (; size != 0 && ((unsigned)(ptrdiff_t)p & (CRC_HW_UNROLL_BYTES - 1)) != 0; size--)
v = __crc32b(v, *p++);
if (size >= CRC_HW_UNROLL_BYTES)
{
const Byte *lim = p + size;
size &= CRC_HW_UNROLL_BYTES - 1;
lim -= size;
do
{
v = CRC_HW_WORD_FUNC(v, *(const CRC_HW_WORD_TYPE *)(const void *)(p));
v = CRC_HW_WORD_FUNC(v, *(const CRC_HW_WORD_TYPE *)(const void *)(p + sizeof(CRC_HW_WORD_TYPE)));
p += 2 * sizeof(CRC_HW_WORD_TYPE);
v = CRC_HW_WORD_FUNC(v, *(const CRC_HW_WORD_TYPE *)(const void *)(p));
v = CRC_HW_WORD_FUNC(v, *(const CRC_HW_WORD_TYPE *)(const void *)(p + sizeof(CRC_HW_WORD_TYPE)));
p += 2 * sizeof(CRC_HW_WORD_TYPE);
}
while (p != lim);
}
for (; size != 0; size--)
v = __crc32b(v, *p++);
return v;
}
#ifdef Z7_ARM_FEATURE_CRC32_WAS_SET
Z7_DIAGNOSTIC_IGNORE_BEGIN_RESERVED_MACRO_IDENTIFIER
#undef __ARM_FEATURE_CRC32
Z7_DIAGNOSTIC_IGNORE_END_RESERVED_MACRO_IDENTIFIER
#undef Z7_ARM_FEATURE_CRC32_WAS_SET
#endif
#endif // defined(Z7_CRC_HW_USE)
#endif // MY_CPU_LE
#ifndef Z7_CRC_HW_FORCE
#if defined(Z7_CRC_HW_USE) || defined(Z7_CRC_UPDATE_T1_FUNC_NAME)
/*
typedef UInt32 (Z7_FASTCALL *Z7_CRC_UPDATE_WITH_TABLE_FUNC)
(UInt32 v, const void *data, size_t size, const UInt32 *table);
Z7_CRC_UPDATE_WITH_TABLE_FUNC g_CrcUpdate;
*/
static unsigned g_Crc_Algo;
#if (!defined(MY_CPU_LE) && !defined(MY_CPU_BE))
static unsigned g_Crc_Be;
#endif
#endif // defined(Z7_CRC_HW_USE) || defined(Z7_CRC_UPDATE_T1_FUNC_NAME)
Z7_NO_INLINE
#ifdef Z7_CRC_HW_USE
static UInt32 Z7_FASTCALL CrcUpdate_Base
#else
UInt32 Z7_FASTCALL CrcUpdate
#endif
(UInt32 crc, const void *data, size_t size)
{
#if Z7_CRC_NUM_TABLES_USE == 1
return Z7_CRC_UPDATE_T1_FUNC_NAME(crc, data, size);
#else // Z7_CRC_NUM_TABLES_USE != 1
#ifdef Z7_CRC_UPDATE_T1_FUNC_NAME
if (g_Crc_Algo == 1)
return Z7_CRC_UPDATE_T1_FUNC_NAME(crc, data, size);
#endif
#ifdef MY_CPU_LE
return FUNC_NAME_LE(crc, data, size, g_CrcTable);
#elif defined(MY_CPU_BE)
return FUNC_NAME_BE(crc, data, size, g_CrcTable);
#else
if (g_Crc_Be)
return FUNC_NAME_BE(crc, data, size, g_CrcTable);
else
return FUNC_NAME_LE(crc, data, size, g_CrcTable);
#endif
#endif // Z7_CRC_NUM_TABLES_USE != 1
}
#ifdef Z7_CRC_HW_USE
Z7_NO_INLINE
UInt32 Z7_FASTCALL CrcUpdate(UInt32 crc, const void *data, size_t size)
{
if (g_Crc_Algo == 0)
return CrcUpdate_HW(crc, data, size);
return CrcUpdate_Base(crc, data, size);
}
#endif
#endif // !defined(Z7_CRC_HW_FORCE)
UInt32 Z7_FASTCALL CrcCalc(const void *data, size_t size)
{
return CrcUpdate(CRC_INIT_VAL, data, size) ^ CRC_INIT_VAL;
}
MY_ALIGN(64)
UInt32 g_CrcTable[256 * Z7_CRC_NUM_TABLES_TOTAL];
void Z7_FASTCALL CrcGenerateTable(void)
{
UInt32 i;
for (i = 0; i < 256; i++)
{
#if defined(Z7_CRC_HW_FORCE)
g_CrcTable[i] = __crc32b(i, 0);
#else
#define kCrcPoly 0xEDB88320
UInt32 r = i;
unsigned j;
for (j = 0; j < 8; j++)
r = (r >> 1) ^ (kCrcPoly & ((UInt32)0 - (r & 1)));
g_CrcTable[i] = r;
#endif
}
for (i = 256; i < 256 * Z7_CRC_NUM_TABLES_USE; i++)
{
const UInt32 r = g_CrcTable[(size_t)i - 256];
g_CrcTable[i] = g_CrcTable[r & 0xFF] ^ (r >> 8);
}
#if !defined(Z7_CRC_HW_FORCE) && \
(defined(Z7_CRC_HW_USE) || defined(Z7_CRC_UPDATE_T1_FUNC_NAME) || defined(MY_CPU_BE))
#if Z7_CRC_NUM_TABLES_USE <= 1
g_Crc_Algo = 1;
#else // Z7_CRC_NUM_TABLES_USE <= 1
#if defined(MY_CPU_LE)
g_Crc_Algo = Z7_CRC_NUM_TABLES_USE;
#else // !defined(MY_CPU_LE)
{
#ifndef MY_CPU_BE
UInt32 k = 0x01020304;
const Byte *p = (const Byte *)&k;
if (p[0] == 4 && p[1] == 3)
g_Crc_Algo = Z7_CRC_NUM_TABLES_USE;
else if (p[0] != 1 || p[1] != 2)
g_Crc_Algo = 1;
else
#endif // MY_CPU_BE
{
for (i = 256 * Z7_CRC_NUM_TABLES_TOTAL - 1; i >= 256; i--)
{
const UInt32 x = g_CrcTable[(size_t)i - 256];
g_CrcTable[i] = Z7_BSWAP32(x);
}
#if defined(Z7_CRC_UPDATE_T1_FUNC_NAME)
g_Crc_Algo = Z7_CRC_NUM_TABLES_USE;
#endif
#if (!defined(MY_CPU_LE) && !defined(MY_CPU_BE))
g_Crc_Be = 1;
#endif
}
}
#endif // !defined(MY_CPU_LE)
#ifdef MY_CPU_LE
#ifdef Z7_CRC_HW_USE
if (CPU_IsSupported_CRC32())
g_Crc_Algo = 0;
#endif // Z7_CRC_HW_USE
#endif // MY_CPU_LE
#endif // Z7_CRC_NUM_TABLES_USE <= 1
#endif // g_Crc_Algo was declared
}
Z7_CRC_UPDATE_FUNC z7_GetFunc_CrcUpdate(unsigned algo)
{
if (algo == 0)
return &CrcUpdate;
#if defined(Z7_CRC_HW_USE)
if (algo == sizeof(CRC_HW_WORD_TYPE) * 8)
{
#ifdef Z7_CRC_HW_FORCE
return &CrcUpdate;
#else
if (g_Crc_Algo == 0)
return &CrcUpdate_HW;
#endif
}
#endif
#ifndef Z7_CRC_HW_FORCE
if (algo == Z7_CRC_NUM_TABLES_USE)
return
#ifdef Z7_CRC_HW_USE
&CrcUpdate_Base;
#else
&CrcUpdate;
#endif
#endif
return NULL;
}
#undef kCrcPoly
#undef Z7_CRC_NUM_TABLES_USE
#undef Z7_CRC_NUM_TABLES_TOTAL
#undef CRC_UPDATE_BYTE_2
#undef FUNC_NAME_LE_2
#undef FUNC_NAME_LE_1
#undef FUNC_NAME_LE
#undef FUNC_NAME_BE_2
#undef FUNC_NAME_BE_1
#undef FUNC_NAME_BE
#undef CRC_HW_UNROLL_BYTES
#undef CRC_HW_WORD_FUNC
#undef CRC_HW_WORD_TYPE
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