| //===------ Pretty print function for FPBits --------------------*- 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_SRC___SUPPORT_FPUTIL_FPBITS_STR_H |
| #define LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H |
| |
| #include "src/__support/CPP/string.h" |
| #include "src/__support/CPP/type_traits.h" |
| #include "src/__support/FPUtil/FPBits.h" |
| #include "src/__support/integer_to_string.h" |
| #include "src/__support/macros/attributes.h" |
| |
| namespace LIBC_NAMESPACE { |
| |
| namespace details { |
| |
| // Format T as uppercase hexadecimal number with leading zeros. |
| template <typename T> |
| using ZeroPaddedHexFmt = IntegerToString< |
| T, typename radix::Hex::WithWidth<(sizeof(T) * 2)>::WithPrefix::Uppercase>; |
| |
| } // namespace details |
| |
| // Converts the bits to a string in the following format: |
| // "0x<NNN...N> = S: N, E: 0xNNNN, M:0xNNN...N" |
| // 1. N is a hexadecimal digit. |
| // 2. The hexadecimal number on the LHS is the raw numerical representation |
| // of the bits. |
| // 3. The exponent is always 16 bits wide irrespective of the type of the |
| // floating encoding. |
| template <typename T> LIBC_INLINE cpp::string str(fputil::FPBits<T> x) { |
| using StorageType = typename fputil::FPBits<T>::StorageType; |
| |
| if (x.is_nan()) |
| return "(NaN)"; |
| if (x.is_inf()) |
| return x.is_neg() ? "(-Infinity)" : "(+Infinity)"; |
| |
| const auto sign_char = [](Sign sign) -> char { |
| return sign.is_neg() ? '1' : '0'; |
| }; |
| |
| cpp::string s; |
| |
| const details::ZeroPaddedHexFmt<StorageType> bits(x.uintval()); |
| s += bits.view(); |
| |
| s += " = (S: "; |
| s += sign_char(x.sign()); |
| |
| s += ", E: "; |
| const details::ZeroPaddedHexFmt<uint16_t> exponent(x.get_biased_exponent()); |
| s += exponent.view(); |
| |
| if constexpr (fputil::get_fp_type<T>() == fputil::FPType::X86_Binary80) { |
| s += ", I: "; |
| s += sign_char(x.get_implicit_bit() ? Sign::NEG : Sign::POS); |
| } |
| |
| s += ", M: "; |
| const details::ZeroPaddedHexFmt<StorageType> mantissa(x.get_mantissa()); |
| s += mantissa.view(); |
| |
| s += ')'; |
| return s; |
| } |
| |
| } // namespace LIBC_NAMESPACE |
| |
| #endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H |