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//===-- Basic operations on floating point numbers --------------*- 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_UTILS_FPUTIL_BASIC_OPERATIONS_H
#define LLVM_LIBC_UTILS_FPUTIL_BASIC_OPERATIONS_H
#include "FPBits.h"
#include "utils/CPP/TypeTraits.h"
namespace __llvm_libc {
namespace fputil {
template <typename T,
cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
static inline T abs(T x) {
FPBits<T> bits(x);
bits.setSign(0);
return T(bits);
}
template <typename T,
cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
static inline T fmin(T x, T y) {
FPBits<T> bitx(x), bity(y);
if (bitx.isNaN()) {
return y;
} else if (bity.isNaN()) {
return x;
} else if (bitx.getSign() != bity.getSign()) {
// To make sure that fmin(+0, -0) == -0 == fmin(-0, +0), whenever x and
// y has different signs and both are not NaNs, we return the number
// with negative sign.
return (bitx.getSign() ? x : y);
} else {
return (x < y ? x : y);
}
}
template <typename T,
cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
static inline T fmax(T x, T y) {
FPBits<T> bitx(x), bity(y);
if (bitx.isNaN()) {
return y;
} else if (bity.isNaN()) {
return x;
} else if (bitx.getSign() != bity.getSign()) {
// To make sure that fmax(+0, -0) == +0 == fmax(-0, +0), whenever x and
// y has different signs and both are not NaNs, we return the number
// with positive sign.
return (bitx.getSign() ? y : x);
} else {
return (x > y ? x : y);
}
}
template <typename T,
cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
static inline T fdim(T x, T y) {
FPBits<T> bitx(x), bity(y);
if (bitx.isNaN()) {
return x;
}
if (bity.isNaN()) {
return y;
}
return (x > y ? x - y : 0);
}
} // namespace fputil
} // namespace __llvm_libc
#endif // LLVM_LIBC_UTILS_FPUTIL_BASIC_OPERATIONS_H
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