libc/src/__support/math/expf.h

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Implementation header for expf.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXPF_H
#define LLVM_LIBC_SRC___SUPPORT_MATH_EXPF_H

#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/optimization.h"
#include "src/__support/macros/properties/cpu_features.h"

#if defined(LIBC_TARGET_ARCH_IS_GPU) &&                                        \
    !defined(LIBC_MATH_HAS_SKIP_ACCURATE_PASS) &&                              \
    (defined(LIBC_MATH_HAS_SMALL_TABLES) ||                                    \
     defined(LIBC_MATH_HAS_INTERMEDIATE_COMP_IN_FLOAT)) &&                     \
    defined(LIBC_MATH_HAS_ASSUME_ROUND_NEAREST_ONLY) &&                        \
    defined(LIBC_MATH_HAS_NO_EXCEPT) && defined(LIBC_MATH_HAS_NO_ERRNO)

#include "src/__support/math/expf_float_eval.h"
#define LIBC_MATH_EXPF_IMPL float_eval::cr_expf_rn

#elif defined(LIBC_MATH_HAS_SKIP_ACCURATE_PASS) &&                             \
    (defined(LIBC_MATH_HAS_SMALL_TABLES) ||                                    \
     defined(LIBC_MATH_HAS_INTERMEDIATE_COMP_IN_FLOAT))

#include "src/__support/math/expf_float_eval.h"
#define LIBC_MATH_EXPF_IMPL float_eval::expf

#elif !defined(LIBC_TARGET_CPU_HAS_FPU_DOUBLE) &&                              \
    defined(LIBC_MATH_HAS_ASSUME_ROUND_NEAREST_ONLY) &&                        \
    defined(LIBC_MATH_HAS_NO_EXCEPT) && defined(LIBC_MATH_HAS_NO_ERRNO)

#include "src/__support/math/expf_integer_eval.h"
#define LIBC_MATH_EXPF_IMPL integer_eval::expf

#else

#include "src/__support/math/expf_double_eval.h"
#define LIBC_MATH_EXPF_IMPL double_eval::expf

#endif

namespace LIBC_NAMESPACE_DECL {
namespace math {

LIBC_INLINE float expf(float x) { return LIBC_MATH_EXPF_IMPL(x); }

} // namespace math
} // namespace LIBC_NAMESPACE_DECL

#undef LIBC_MATH_EXPF_IMPL

#endif // LLVM_LIBC_SRC___SUPPORT_MATH_EXPF_H