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cpu_features.c
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/
cpu_features.c
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/* cpu_features.c -- Processor features detection.
*
* Copyright 2018 The Chromium Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the Chromium source repository LICENSE file.
*/
#include "cpu_features.h"
#include "zutil.h"
#include <stdint.h>
#if defined(_MSC_VER)
#include <intrin.h>
#elif defined(ADLER32_SIMD_SSSE3)
#include <cpuid.h>
#endif
/* TODO(cavalcantii): remove checks for x86_flags on deflate.
*/
#if defined(ARMV8_OS_MACOS)
/* Crypto extensions (crc32/pmull) are a baseline feature in ARMv8.1-A, and
* OSX running on arm64 is new enough that these can be assumed without
* runtime detection.
*/
int ZLIB_INTERNAL arm_cpu_enable_crc32 = 1;
int ZLIB_INTERNAL arm_cpu_enable_pmull = 1;
#else
int ZLIB_INTERNAL arm_cpu_enable_crc32 = 0;
int ZLIB_INTERNAL arm_cpu_enable_pmull = 0;
#endif
int ZLIB_INTERNAL x86_cpu_enable_sse2 = 0;
int ZLIB_INTERNAL x86_cpu_enable_ssse3 = 0;
int ZLIB_INTERNAL x86_cpu_enable_simd = 0;
int ZLIB_INTERNAL x86_cpu_enable_avx512 = 0;
int ZLIB_INTERNAL riscv_cpu_enable_rvv = 0;
int ZLIB_INTERNAL riscv_cpu_enable_vclmul = 0;
#ifndef CPU_NO_SIMD
#if defined(ARMV8_OS_ANDROID) || defined(ARMV8_OS_LINUX) || \
defined(ARMV8_OS_FUCHSIA) || defined(ARMV8_OS_IOS)
#include <pthread.h>
#endif
#if defined(ARMV8_OS_ANDROID)
#include <cpu-features.h>
#elif defined(ARMV8_OS_LINUX)
#include <asm/hwcap.h>
#include <sys/auxv.h>
#elif defined(ARMV8_OS_FUCHSIA)
#include <zircon/features.h>
#include <zircon/syscalls.h>
#include <zircon/types.h>
#elif defined(ARMV8_OS_WINDOWS) || defined(X86_WINDOWS)
#include <windows.h>
#elif defined(ARMV8_OS_IOS)
#include <sys/sysctl.h>
#elif !defined(_MSC_VER)
#include <pthread.h>
#else
#error cpu_features.c CPU feature detection in not defined for your platform
#endif
#if !defined(CPU_NO_SIMD) && !defined(ARMV8_OS_MACOS)
static void _cpu_check_features(void);
#endif
#if defined(ARMV8_OS_ANDROID) || defined(ARMV8_OS_LINUX) || \
defined(ARMV8_OS_MACOS) || defined(ARMV8_OS_FUCHSIA) || \
defined(X86_NOT_WINDOWS) || defined(ARMV8_OS_IOS) || \
defined(RISCV_RVV)
#if !defined(ARMV8_OS_MACOS)
// _cpu_check_features() doesn't need to do anything on mac/arm since all
// features are known at build time, so don't call it.
// Do provide cpu_check_features() (with a no-op implementation) so that we
// don't have to make all callers of it check for mac/arm.
static pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT;
#endif
void ZLIB_INTERNAL cpu_check_features(void)
{
#if !defined(ARMV8_OS_MACOS)
pthread_once(&cpu_check_inited_once, _cpu_check_features);
#endif
}
#elif defined(ARMV8_OS_WINDOWS) || defined(X86_WINDOWS)
static INIT_ONCE cpu_check_inited_once = INIT_ONCE_STATIC_INIT;
static BOOL CALLBACK _cpu_check_features_forwarder(PINIT_ONCE once, PVOID param, PVOID* context)
{
_cpu_check_features();
return TRUE;
}
void ZLIB_INTERNAL cpu_check_features(void)
{
InitOnceExecuteOnce(&cpu_check_inited_once, _cpu_check_features_forwarder,
NULL, NULL);
}
#endif
#if (defined(__ARM_NEON__) || defined(__ARM_NEON))
#if !defined(ARMV8_OS_MACOS)
/*
* See http://bit.ly/2CcoEsr for run-time detection of ARM features and also
* crbug.com/931275 for android_getCpuFeatures() use in the Android sandbox.
*/
static void _cpu_check_features(void)
{
#if defined(ARMV8_OS_ANDROID) && defined(__aarch64__)
uint64_t features = android_getCpuFeatures();
arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM64_FEATURE_CRC32);
arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM64_FEATURE_PMULL);
#elif defined(ARMV8_OS_ANDROID) /* aarch32 */
uint64_t features = android_getCpuFeatures();
arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM_FEATURE_CRC32);
arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM_FEATURE_PMULL);
#elif defined(ARMV8_OS_LINUX) && defined(__aarch64__)
unsigned long features = getauxval(AT_HWCAP);
arm_cpu_enable_crc32 = !!(features & HWCAP_CRC32);
arm_cpu_enable_pmull = !!(features & HWCAP_PMULL);
#elif defined(ARMV8_OS_LINUX) && (defined(__ARM_NEON) || defined(__ARM_NEON__))
/* Query HWCAP2 for ARMV8-A SoCs running in aarch32 mode */
unsigned long features = getauxval(AT_HWCAP2);
arm_cpu_enable_crc32 = !!(features & HWCAP2_CRC32);
arm_cpu_enable_pmull = !!(features & HWCAP2_PMULL);
#elif defined(ARMV8_OS_FUCHSIA)
uint32_t features;
zx_status_t rc = zx_system_get_features(ZX_FEATURE_KIND_CPU, &features);
if (rc != ZX_OK || (features & ZX_ARM64_FEATURE_ISA_ASIMD) == 0)
return; /* Report nothing if ASIMD(NEON) is missing */
arm_cpu_enable_crc32 = !!(features & ZX_ARM64_FEATURE_ISA_CRC32);
arm_cpu_enable_pmull = !!(features & ZX_ARM64_FEATURE_ISA_PMULL);
#elif defined(ARMV8_OS_WINDOWS)
arm_cpu_enable_crc32 = IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE);
arm_cpu_enable_pmull = IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE);
#elif defined(ARMV8_OS_IOS)
// Determine what features are supported dynamically. This code is applicable to macOS
// as well if we wish to do that dynamically on that platform in the future.
// See https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics
int val = 0;
size_t len = sizeof(val);
arm_cpu_enable_crc32 = sysctlbyname("hw.optional.armv8_crc32", &val, &len, 0, 0) == 0
&& val != 0;
val = 0;
len = sizeof(val);
arm_cpu_enable_pmull = sysctlbyname("hw.optional.arm.FEAT_PMULL", &val, &len, 0, 0) == 0
&& val != 0;
#endif
}
#endif
#elif defined(X86_NOT_WINDOWS) || defined(X86_WINDOWS)
/*
* iOS@x86 (i.e. emulator) is another special case where we disable
* SIMD optimizations.
*/
#ifndef CPU_NO_SIMD
/* On x86 we simply use a instruction to check the CPU features.
* (i.e. CPUID).
*/
#ifdef CRC32_SIMD_AVX512_PCLMUL
#include <immintrin.h>
#include <xsaveintrin.h>
#endif
static void _cpu_check_features(void)
{
int x86_cpu_has_sse2;
int x86_cpu_has_ssse3;
int x86_cpu_has_sse42;
int x86_cpu_has_pclmulqdq;
int abcd[4];
#ifdef _MSC_VER
__cpuid(abcd, 1);
#else
__cpuid(1, abcd[0], abcd[1], abcd[2], abcd[3]);
#endif
x86_cpu_has_sse2 = abcd[3] & 0x4000000;
x86_cpu_has_ssse3 = abcd[2] & 0x000200;
x86_cpu_has_sse42 = abcd[2] & 0x100000;
x86_cpu_has_pclmulqdq = abcd[2] & 0x2;
x86_cpu_enable_sse2 = x86_cpu_has_sse2;
x86_cpu_enable_ssse3 = x86_cpu_has_ssse3;
x86_cpu_enable_simd = x86_cpu_has_sse2 &&
x86_cpu_has_sse42 &&
x86_cpu_has_pclmulqdq;
#ifdef CRC32_SIMD_AVX512_PCLMUL
x86_cpu_enable_avx512 = _xgetbv(0) & 0x00000040;
#endif
}
#endif // x86 & NO_SIMD
#elif defined(RISCV_RVV)
#include <sys/auxv.h>
#ifndef ZLIB_HWCAP_RVV
#define ZLIB_HWCAP_RVV (1 << ('v' - 'a'))
#endif
/* TODO(cavalcantii)
* - add support for Android@RISCV i.e. __riscv_hwprobe().
* - detect vclmul (crypto extensions).
*/
static void _cpu_check_features(void)
{
unsigned long features = getauxval(AT_HWCAP);
riscv_cpu_enable_rvv = !!(features & ZLIB_HWCAP_RVV);
}
#endif // ARM | x86 | RISCV
#endif // NO SIMD CPU