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Rewrite the logic to check for CRC32 at runtime (#3072)

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* rewrite the logic to check for CRC32 at runtime

* fix include for windows

* fix pragmas

* more clang fixes

* MORE

* Please apple

* I hate this

* MAC AGAIN

* Clarify the ifdefs

* ARM64 fixes
This commit is contained in:
louist103 2023-08-11 23:02:05 -04:00 committed by GitHub
parent 06548b3ceb
commit d22ca3cfc3
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1 changed files with 51 additions and 17 deletions
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68
soh/soh/Extractor/FastCrc32C.c
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@ -1,14 +1,28 @@
#include <stdint.h>
#include <stddef.h>
// Force the compiler to assume we have support for the CRC32 intrinsic. We will check for our selves later.
// Clang will define both __llvm__ and __GNUC__ but GCC will only define __GNUC__. So we need to check for __llvm__ first.
#if ((defined(__llvm__) && (defined(__x86_64__) || defined(__i386__))))
#pragma clang attribute push(__attribute__((target("crc32"))), apply_to = function)
#elif ((defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))))
// GCC Only lets you enable all of sse4.2 so we will for just this file and reset it at the end.
#pragma GCC push_options
#pragma GCC target("sse4.2")
#endif
// Include headers for the CRC32 intrinsic and cpuid instruction on windows. No need to do any other checks because it assumes the target will support CRC32
#ifdef _WIN32
#include <immintrin.h>
#elif ((defined(__GNUC__) && defined(__x86_64__) || defined(__i386__)) && defined(__SSE4_2__))
#include <intrin.h>
// Same as above but these platforms use slightly different headers
#elif ((defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))))
#include <nmmintrin.h>
#include <cpuid.h>
#elif defined(__aarch64__) && defined(__ARM_FEATURE_CRC32)
// Nothing cause its a compiler builtin
#else
#define USE_CRC_TABLE
#define NO_CRC_INTRIN
#endif
#if defined(__aarch64__) && defined(__ARM_FEATURE_CRC32)
@ -16,14 +30,13 @@
#define INTRIN_CRC32_32(crc, value) __asm__("crc32cw %w[c], %w[c], %w[v]" : [c] "+r"(crc) : [v] "r"(value))
#define INTRIN_CRC32_16(crc, value) __asm__("crc32ch %w[c], %w[c], %w[v]" : [c] "+r"(crc) : [v] "r"(value))
#define INTRIN_CRC32_8(crc, value) __asm__("crc32cb %w[c], %w[c], %w[v]" : [c] "+r"(crc) : [v] "r"(value))
#elif defined(__SSE4_2__) || defined(_MSC_VER)
#elif defined(__GNUC__) || defined(_MSC_VER)
#define INTRIN_CRC32_64(crc, data) crc = _mm_crc32_u64(crc, data)
#define INTRIN_CRC32_32(crc, data) crc = _mm_crc32_u32(crc, data)
#define INTRIN_CRC32_16(crc, data) crc = _mm_crc32_u16(crc, data)
#define INTRIN_CRC32_8(crc, data) crc = _mm_crc32_u8(crc, data)
#endif
#ifdef USE_CRC_TABLE
static const uint32_t crc32Table[256] = {
0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, 0x8AD958CFL,
0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, 0x105EC76FL, 0xE235446CL,
@ -55,17 +68,13 @@ static const uint32_t crc32Table[256] = {
0xE03E9C81L, 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
};
#endif
// On platforms that we know will never support a crc32 instruction (such as the WiiU) we will skip compiling this function in.
#ifndef NO_CRC_INTRIN
#ifdef __cplusplus
extern "C" {
#endif
#ifndef USE_CRC_TABLE
uint32_t CRC32C(unsigned char* data, size_t dataSize) {
static uint32_t CRC32IntrinImpl(unsigned char* data, size_t dataSize) {
uint32_t ret = 0xFFFFFFFF;
int64_t sizeSigned = dataSize;
// Only 64bit platforms support doing a CRC32 operation on a 64bit value
#if defined(_M_X64) || defined(__x86_64__) || defined(__aarch64__)
while ((sizeSigned -= sizeof(uint64_t)) >= 0) {
INTRIN_CRC32_64(ret, *(uint64_t*)data);
@ -77,6 +86,7 @@ uint32_t CRC32C(unsigned char* data, size_t dataSize) {
data += sizeof(uint32_t);
}
// On 32 bit we can only do 32bit operations
#elif defined(_M_IX86) || defined(__i386__)
while ((sizeSigned -= sizeof(uint32_t)) >= 0) {
INTRIN_CRC32_32(ret, *(uint32_t*)data);
@ -94,17 +104,41 @@ uint32_t CRC32C(unsigned char* data, size_t dataSize) {
return ~ret;
}
#else
uint32_t CRC32C(const void* buf, size_t size) {
const uint8_t* p = buf;
#endif
static uint32_t CRC32TableImpl(unsigned char* data, size_t dataSize) {
const uint8_t* p = data;
uint32_t crc = 0xFFFFFFFF;
while (size--)
while (dataSize--)
crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
return ~crc;
}
uint32_t CRC32C(unsigned char* data, size_t dataSize) {
#ifndef NO_CRC_INTRIN
// Test to make sure the CPU supports the CRC32 intrinsic
unsigned int cpuidData[4];
#ifdef _WIN32
__cpuid(cpuidData, 1);
#elif __APPLE__ || (defined(__aarch64__) && defined(__ARM_FEATURE_CRC32))
// Every Mac that supports SoH should support this instruction. Also check for ARM64 at the same time
return CRC32IntrinImpl(data, dataSize);
#else
__get_cpuid(1, &cpuidData[0], &cpuidData[1], &cpuidData[2], &cpuidData[3]);
#endif
#ifdef __cplusplus
if (cpuidData[2] & (1 << 20)) { // bit_SSE4_2
return CRC32IntrinImpl(data, dataSize);
}
#endif // NO_CRC_INTRIN
return CRC32TableImpl(data, dataSize);
}
#if ((defined(__llvm__) && (defined(__x86_64__) || defined(__i386__))))
#pragma clang attribute pop
#elif ((defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))))
#pragma GCC pop_options
#else
#endif