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//===-- Common internal contructs -------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SUPPORT_COMMON_H
#define LLVM_LIBC_SUPPORT_COMMON_H
#include "src/__support/macros/attributes.h"
#include "src/__support/macros/properties/architectures.h"
#ifndef LLVM_LIBC_FUNCTION_ATTR
#define LLVM_LIBC_FUNCTION_ATTR
#endif
// GPU targets do not support aliasing.
#if defined(LIBC_COPT_PUBLIC_PACKAGING) && defined(LIBC_TARGET_ARCH_IS_GPU)
#define LLVM_LIBC_FUNCTION_IMPL(type, name, arglist) \
LLVM_LIBC_FUNCTION_ATTR decltype(__llvm_libc::name) \
__##name##_impl__ __asm__(#name); \
type __##name##_impl__ arglist
// MacOS needs to be excluded because it does not support aliasing.
#elif defined(LIBC_COPT_PUBLIC_PACKAGING) && (!defined(__APPLE__))
#define LLVM_LIBC_FUNCTION_IMPL(type, name, arglist) \
LLVM_LIBC_FUNCTION_ATTR decltype(__llvm_libc::name) \
__##name##_impl__ __asm__(#name); \
decltype(__llvm_libc::name) name [[gnu::alias(#name)]]; \
type __##name##_impl__ arglist
#else
#define LLVM_LIBC_FUNCTION_IMPL(type, name, arglist) type name arglist
#endif
// This extra layer of macro allows `name` to be a macro to rename a function.
#define LLVM_LIBC_FUNCTION(type, name, arglist) \
LLVM_LIBC_FUNCTION_IMPL(type, name, arglist)
namespace __llvm_libc {
namespace internal {
constexpr bool same_string(char const *lhs, char const *rhs) {
for (; *lhs || *rhs; ++lhs, ++rhs)
if (*lhs != *rhs)
return false;
return true;
}
} // namespace internal
} // namespace __llvm_libc
// LLVM_LIBC_IS_DEFINED checks whether a particular macro is defined.
// Usage: constexpr bool kUseAvx = LLVM_LIBC_IS_DEFINED(__AVX__);
//
// This works by comparing the stringified version of the macro with and without
// evaluation. If FOO is not undefined both stringifications yield "FOO". If FOO
// is defined, one stringification yields "FOO" while the other yields its
// stringified value "1".
#define LLVM_LIBC_IS_DEFINED(macro) \
!__llvm_libc::internal::same_string( \
LLVM_LIBC_IS_DEFINED__EVAL_AND_STRINGIZE(macro), #macro)
#define LLVM_LIBC_IS_DEFINED__EVAL_AND_STRINGIZE(s) #s
#endif // LLVM_LIBC_SUPPORT_COMMON_H
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