69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines several macros, based on the current compiler. This allows
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// use of compiler-specific features in a way that remains portable.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_COMPILER_H
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#define LLVM_SUPPORT_COMPILER_H
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#ifndef __has_feature
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# define __has_feature(x) 0
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#endif
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#ifndef __has_extension
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# define __has_extension(x) 0
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#endif
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#ifndef __has_attribute
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# define __has_attribute(x) 0
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#endif
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#ifndef __has_builtin
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# define __has_builtin(x) 0
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#endif
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/// \macro LLVM_GNUC_PREREQ
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/// \brief Extend the default __GNUC_PREREQ even if glibc's features.h isn't
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/// available.
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#ifndef LLVM_GNUC_PREREQ
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# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
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# define LLVM_GNUC_PREREQ(maj, min, patch) \
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((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
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((maj) << 20) + ((min) << 10) + (patch))
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# elif defined(__GNUC__) && defined(__GNUC_MINOR__)
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# define LLVM_GNUC_PREREQ(maj, min, patch) \
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((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
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# else
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# define LLVM_GNUC_PREREQ(maj, min, patch) 0
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# endif
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#endif
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#ifndef LLVM_ATTRIBUTE_UNUSED_RESULT
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#if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0)
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#define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__))
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#else
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#define LLVM_ATTRIBUTE_UNUSED_RESULT
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#endif
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#endif
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#ifndef LLVM_UNLIKELY
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#if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
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#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
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#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
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#else
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#define LLVM_LIKELY(EXPR) (EXPR)
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#define LLVM_UNLIKELY(EXPR) (EXPR)
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#endif
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#endif
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#endif
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