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Merge pull request #2893 from terrelln/issue-2789
[asm] Share portability macros and restrict ASM further
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (c) Facebook, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * This source code is licensed under both the BSD-style license (found in the | ||
| * LICENSE file in the root directory of this source tree) and the GPLv2 (found | ||
| * in the COPYING file in the root directory of this source tree). | ||
| * You may select, at your option, one of the above-listed licenses. | ||
| */ | ||
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| #ifndef ZSTD_PORTABILITY_MACROS_H | ||
| #define ZSTD_PORTABILITY_MACROS_H | ||
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| /** | ||
| * This header file contains macro defintions to support portability. | ||
| * This header is shared between C and ASM code, so it MUST only | ||
| * contain macro definitions. It MUST not contain any C code. | ||
| * | ||
| * This header ONLY defines macros to detect platforms/feature support. | ||
| * | ||
| */ | ||
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| /* compat. with non-clang compilers */ | ||
| #ifndef __has_attribute | ||
| #define __has_attribute(x) 0 | ||
| #endif | ||
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| /* compat. with non-clang compilers */ | ||
| #ifndef __has_builtin | ||
| # define __has_builtin(x) 0 | ||
| #endif | ||
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| /* compat. with non-clang compilers */ | ||
| #ifndef __has_feature | ||
| # define __has_feature(x) 0 | ||
| #endif | ||
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| /* detects whether we are being compiled under msan */ | ||
| #ifndef ZSTD_MEMORY_SANITIZER | ||
| # if __has_feature(memory_sanitizer) | ||
| # define ZSTD_MEMORY_SANITIZER 1 | ||
| # else | ||
| # define ZSTD_MEMORY_SANITIZER 0 | ||
| # endif | ||
| #endif | ||
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| /* detects whether we are being compiled under asan */ | ||
| #ifndef ZSTD_ADDRESS_SANITIZER | ||
| # if __has_feature(address_sanitizer) | ||
| # define ZSTD_ADDRESS_SANITIZER 1 | ||
| # elif defined(__SANITIZE_ADDRESS__) | ||
| # define ZSTD_ADDRESS_SANITIZER 1 | ||
| # else | ||
| # define ZSTD_ADDRESS_SANITIZER 0 | ||
| # endif | ||
| #endif | ||
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| /* detects whether we are being compiled under dfsan */ | ||
| #ifndef ZSTD_DATAFLOW_SANITIZER | ||
| # if __has_feature(dataflow_sanitizer) | ||
| # define ZSTD_DATAFLOW_SANITIZER 1 | ||
| # else | ||
| # define ZSTD_DATAFLOW_SANITIZER 0 | ||
| # endif | ||
| #endif | ||
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| /* Enable runtime BMI2 dispatch based on the CPU. | ||
| * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. | ||
| */ | ||
| #ifndef DYNAMIC_BMI2 | ||
| #if ((defined(__clang__) && __has_attribute(__target__)) \ | ||
| || (defined(__GNUC__) \ | ||
| && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \ | ||
| && (defined(__x86_64__) || defined(_M_X64)) \ | ||
| && !defined(__BMI2__) | ||
| # define DYNAMIC_BMI2 1 | ||
| #else | ||
| # define DYNAMIC_BMI2 0 | ||
| #endif | ||
| #endif | ||
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| /** | ||
| * Only enable assembly for GNUC comptabile compilers, | ||
| * because other platforms may not support GAS assembly syntax. | ||
| * | ||
| * Only enable assembly for Linux / MacOS, other platforms may | ||
| * work, but they haven't been tested. This could likely be | ||
| * extended to BSD systems. | ||
| * | ||
| * Disable assembly when MSAN is enabled, because MSAN requires | ||
| * 100% of code to be instrumented to work. | ||
| */ | ||
| #if defined(__GNUC__) | ||
| # if defined(__linux__) || defined(__linux) || defined(__APPLE__) | ||
| # if ZSTD_MEMORY_SANITIZER | ||
| # define ZSTD_ASM_SUPPORTED 0 | ||
| # else | ||
| # define ZSTD_ASM_SUPPORTED 1 | ||
| # endif | ||
| # else | ||
| # define ZSTD_ASM_SUPPORTED 0 | ||
| # endif | ||
| #else | ||
| # define ZSTD_ASM_SUPPORTED 0 | ||
| #endif | ||
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| /** | ||
| * Determines whether we should enable assembly for x86-64 | ||
| * with BMI2. | ||
| * | ||
| * Enable if all of the following conditions hold: | ||
| * - ASM hasn't been explicitly disabled by defining ZSTD_DISABLE_ASM | ||
| * - Assembly is supported | ||
| * - We are compiling for x86-64 and either: | ||
| * - DYNAMIC_BMI2 is enabled | ||
| * - BMI2 is supported at compile time | ||
| */ | ||
| #if !defined(ZSTD_DISABLE_ASM) && \ | ||
| ZSTD_ASM_SUPPORTED && \ | ||
| defined(__x86_64__) && \ | ||
| (DYNAMIC_BMI2 || defined(__BMI2__)) | ||
| # define ZSTD_ENABLE_ASM_X86_64_BMI2 1 | ||
| #else | ||
| # define ZSTD_ENABLE_ASM_X86_64_BMI2 0 | ||
| #endif | ||
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| #endif /* ZSTD_PORTABILITY_MACROS_H */ |
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