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1/*2 * Copyright (c) Facebook, Inc.3 * All rights reserved.4 *5 * This source code is licensed under both the BSD-style license (found in the6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found7 * in the COPYING file in the root directory of this source tree).8 * You may select, at your option, one of the above-listed licenses.9 */10 11#ifndef ZSTD_PORTABILITY_MACROS_H12#define ZSTD_PORTABILITY_MACROS_H13 14/*15 * This header file contains macro defintions to support portability.16 * This header is shared between C and ASM code, so it MUST only17 * contain macro definitions. It MUST not contain any C code.18 *19 * This header ONLY defines macros to detect platforms/feature support.20 *21 */22 23 24/* compat. with non-clang compilers */25#ifndef __has_attribute26 #define __has_attribute(x) 027#endif28 29/* compat. with non-clang compilers */30#ifndef __has_builtin31# define __has_builtin(x) 032#endif33 34/* compat. with non-clang compilers */35#ifndef __has_feature36# define __has_feature(x) 037#endif38 39/* detects whether we are being compiled under msan */40 41/* detects whether we are being compiled under asan */42 43/* detects whether we are being compiled under dfsan */44 45/* Mark the internal assembly functions as hidden */46#ifdef __ELF__47# define ZSTD_HIDE_ASM_FUNCTION(func) .hidden func48#else49# define ZSTD_HIDE_ASM_FUNCTION(func)50#endif51 52/* Enable runtime BMI2 dispatch based on the CPU.53 * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default.54 */55#ifndef DYNAMIC_BMI256 #if ((defined(__clang__) && __has_attribute(__target__)) \57 || (defined(__GNUC__) \58 && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \59 && (defined(__x86_64__) || defined(_M_X64)) \60 && !defined(__BMI2__)61 # define DYNAMIC_BMI2 162 #else63 # define DYNAMIC_BMI2 064 #endif65#endif66 67/*68 * Only enable assembly for GNUC comptabile compilers,69 * because other platforms may not support GAS assembly syntax.70 *71 * Only enable assembly for Linux / MacOS, other platforms may72 * work, but they haven't been tested. This could likely be73 * extended to BSD systems.74 *75 * Disable assembly when MSAN is enabled, because MSAN requires76 * 100% of code to be instrumented to work.77 */78#define ZSTD_ASM_SUPPORTED 179 80/*81 * Determines whether we should enable assembly for x86-6482 * with BMI2.83 *84 * Enable if all of the following conditions hold:85 * - ASM hasn't been explicitly disabled by defining ZSTD_DISABLE_ASM86 * - Assembly is supported87 * - We are compiling for x86-64 and either:88 * - DYNAMIC_BMI2 is enabled89 * - BMI2 is supported at compile time90 */91#define ZSTD_ENABLE_ASM_X86_64_BMI2 092 93#endif /* ZSTD_PORTABILITY_MACROS_H */94