forked from OSchip/llvm-project
91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
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//===-- Floating point classification functions -----------------*- 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_CLASSIFICATION_FUNCTIONS_H
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#define LLVM_LIBC_UTILS_FPUTIL_CLASSIFICATION_FUNCTIONS_H
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#include "BitPatterns.h"
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#include "FloatOperations.h"
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#include "FloatProperties.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 BitsType> static inline bool bitsAreInf(BitsType bits) {
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using FPType = typename FloatType<BitsType>::Type;
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return ((bits & BitPatterns<FPType>::inf) == BitPatterns<FPType>::inf) &&
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((bits & FloatProperties<FPType>::mantissaMask) == 0);
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}
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// Return true if x is infinity (positive or negative.)
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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 bool isInf(T x) {
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return bitsAreInf(valueAsBits(x));
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}
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template <typename BitsType> static inline bool bitsAreNaN(BitsType bits) {
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using FPType = typename FloatType<BitsType>::Type;
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return ((bits & BitPatterns<FPType>::inf) == BitPatterns<FPType>::inf) &&
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((bits & FloatProperties<FPType>::mantissaMask) != 0);
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}
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// Return true if x is a NAN (quiet or signalling.)
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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 bool isNaN(T x) {
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return bitsAreNaN(valueAsBits(x));
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}
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template <typename BitsType> static inline bool bitsAreInfOrNaN(BitsType bits) {
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using FPType = typename FloatType<BitsType>::Type;
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return (bits & BitPatterns<FPType>::inf) == BitPatterns<FPType>::inf;
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}
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template <typename BitsType> static inline bool bitsAreZero(BitsType bits) {
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using FPType = typename FloatType<BitsType>::Type;
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return (bits == BitPatterns<FPType>::zero) ||
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(bits == BitPatterns<FPType>::negZero);
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}
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// Return true if x is any kind of NaN or infinity.
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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 bool isInfOrNaN(T x) {
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return bitsAreInfOrNaN(valueAsBits(x));
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}
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// Return true if x is a quiet NAN.
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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 bool isQuietNaN(T x) {
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using Properties = FloatProperties<T>;
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using BitsType = typename FloatProperties<T>::BitsType;
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BitsType bits = valueAsBits(x);
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return ((bits & BitPatterns<T>::inf) == BitPatterns<T>::inf) &&
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((bits & Properties::quietNaNMask) != 0);
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}
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// Return true if x is a quiet NAN with sign bit set.
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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 bool isNegativeQuietNaN(T x) {
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using Properties = FloatProperties<T>;
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using BitsType = typename FloatProperties<T>::BitsType;
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BitsType bits = valueAsBits(x);
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return ((bits & BitPatterns<T>::negInf) == BitPatterns<T>::negInf) &&
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((bits & Properties::quietNaNMask) != 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_CLASSIFICATION_FUNCTIONS_H
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