6666e0d7a2
This helps us avoid the uncomfortable reinterpret-casts. Avoiding the reinterpret casts prevents us from tripping the sanitizers as well. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D100360
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
//===-- Basic operations on floating point numbers --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_UTILS_FPUTIL_BASIC_OPERATIONS_H
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#define LLVM_LIBC_UTILS_FPUTIL_BASIC_OPERATIONS_H
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#include "FPBits.h"
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#include "utils/CPP/TypeTraits.h"
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namespace __llvm_libc {
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namespace fputil {
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template <typename T,
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cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
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static inline T abs(T x) {
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FPBits<T> bits(x);
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bits.encoding.sign = 0;
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return T(bits);
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}
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template <typename T,
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cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
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static inline T fmin(T x, T y) {
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FPBits<T> bitx(x), bity(y);
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if (bitx.isNaN()) {
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return y;
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} else if (bity.isNaN()) {
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return x;
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} else if (bitx.encoding.sign != bity.encoding.sign) {
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// To make sure that fmin(+0, -0) == -0 == fmin(-0, +0), whenever x and
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// y has different signs and both are not NaNs, we return the number
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// with negative sign.
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return (bitx.encoding.sign ? x : y);
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} else {
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return (x < y ? x : y);
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}
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}
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template <typename T,
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cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
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static inline T fmax(T x, T y) {
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FPBits<T> bitx(x), bity(y);
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if (bitx.isNaN()) {
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return y;
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} else if (bity.isNaN()) {
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return x;
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} else if (bitx.encoding.sign != bity.encoding.sign) {
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// To make sure that fmax(+0, -0) == +0 == fmax(-0, +0), whenever x and
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// y has different signs and both are not NaNs, we return the number
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// with positive sign.
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return (bitx.encoding.sign ? y : x);
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} else {
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return (x > y ? x : y);
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}
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}
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template <typename T,
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cpp::EnableIfType<cpp::IsFloatingPointType<T>::Value, int> = 0>
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static inline T fdim(T x, T y) {
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FPBits<T> bitx(x), bity(y);
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if (bitx.isNaN()) {
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return x;
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}
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if (bity.isNaN()) {
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return y;
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}
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return (x > y ? x - y : 0);
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}
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} // namespace fputil
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_UTILS_FPUTIL_BASIC_OPERATIONS_H
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