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| 1 | //===------ Pretty print function for FPBits --------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H |
| 10 | #define LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H |
| 11 | |
| 12 | #include "src/__support/CPP/string.h" |
| 13 | #include "src/__support/CPP/type_traits.h" |
| 14 | #include "src/__support/FPUtil/FPBits.h" |
| 15 | #include "src/__support/integer_to_string.h" |
| 16 | #include "src/__support/macros/attributes.h" |
| 17 | #include "src/__support/macros/config.h" |
| 18 | |
| 19 | namespace LIBC_NAMESPACE_DECL { |
| 20 | |
| 21 | namespace details { |
| 22 | |
| 23 | // Format T as uppercase hexadecimal number with leading zeros. |
| 24 | template <typename T> |
| 25 | using ZeroPaddedHexFmt = IntegerToString< |
| 26 | T, typename radix::Hex::WithWidth<(sizeof(T) * 2)>::WithPrefix::Uppercase>; |
| 27 | |
| 28 | } // namespace details |
| 29 | |
| 30 | // Converts the bits to a string in the following format: |
| 31 | // "0x<NNN...N> = S: N, E: 0xNNNN, M:0xNNN...N" |
| 32 | // 1. N is a hexadecimal digit. |
| 33 | // 2. The hexadecimal number on the LHS is the raw numerical representation |
| 34 | // of the bits. |
| 35 | // 3. The exponent is always 16 bits wide irrespective of the type of the |
| 36 | // floating encoding. |
| 37 | template <typename T> LIBC_INLINE cpp::string str(fputil::FPBits<T> x) { |
| 38 | using StorageType = typename fputil::FPBits<T>::StorageType; |
| 39 | |
| 40 | if (x.is_nan()) |
| 41 | return "(NaN)"; |
| 42 | if (x.is_inf()) |
| 43 | return x.is_neg() ? "(-Infinity)" : "(+Infinity)"; |
| 44 | |
| 45 | const auto sign_char = [](Sign sign) -> char { |
| 46 | return sign.is_neg() ? '1' : '0'; |
| 47 | }; |
| 48 | |
| 49 | cpp::string s; |
| 50 | |
| 51 | const details::ZeroPaddedHexFmt<StorageType> bits(x.uintval()); |
| 52 | s += bits.view(); |
| 53 | |
| 54 | s += " = (S: "; |
| 55 | s += sign_char(x.sign()); |
| 56 | |
| 57 | s += ", E: "; |
| 58 | const details::ZeroPaddedHexFmt<uint16_t> exponent(x.get_biased_exponent()); |
| 59 | s += exponent.view(); |
| 60 | |
| 61 | if constexpr (fputil::get_fp_type<T>() == fputil::FPType::X86_Binary80) { |
| 62 | s += ", I: "; |
| 63 | s += sign_char(x.get_implicit_bit() ? Sign::NEG : Sign::POS); |
| 64 | } |
| 65 | |
| 66 | s += ", M: "; |
| 67 | const details::ZeroPaddedHexFmt<StorageType> mantissa(x.get_mantissa()); |
| 68 | s += mantissa.view(); |
| 69 | |
| 70 | s += ')'; |
| 71 | return s; |
| 72 | } |
| 73 | |
| 74 | } // namespace LIBC_NAMESPACE_DECL |
| 75 | |
| 76 | #endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_FPBITS_STR_H |
| 77 |
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