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| 1 | //===-- Conversion between floating-point types -----------------*- 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_CAST_H |
| 10 | #define LLVM_LIBC_SRC___SUPPORT_FPUTIL_CAST_H |
| 11 | |
| 12 | #include "FPBits.h" |
| 13 | #include "dyadic_float.h" |
| 14 | #include "hdr/fenv_macros.h" |
| 15 | #include "src/__support/CPP/algorithm.h" |
| 16 | #include "src/__support/CPP/type_traits.h" |
| 17 | #include "src/__support/macros/properties/types.h" |
| 18 | |
| 19 | namespace LIBC_NAMESPACE::fputil { |
| 20 | |
| 21 | // TODO: Add optimization for known good targets with fast |
| 22 | // float to float16 conversion: |
| 23 | // https://github.com/llvm/llvm-project/issues/133517 |
| 24 | template <typename OutType, typename InType> |
| 25 | LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_floating_point_v<OutType> && |
| 26 | cpp::is_floating_point_v<InType>, |
| 27 | OutType> |
| 28 | cast(InType x) { |
| 29 | #if defined(LIBC_TYPES_HAS_FLOAT16) && !defined(__LIBC_USE_FLOAT16_CONVERSION) |
| 30 | if constexpr (cpp::is_same_v<OutType, float16> || |
| 31 | cpp::is_same_v<InType, float16>) { |
| 32 | using InFPBits = FPBits<InType>; |
| 33 | using InStorageType = typename InFPBits::StorageType; |
| 34 | using OutFPBits = FPBits<OutType>; |
| 35 | using OutStorageType = typename OutFPBits::StorageType; |
| 36 | |
| 37 | InFPBits x_bits(x); |
| 38 | |
| 39 | if (x_bits.is_nan()) { |
| 40 | if (x_bits.is_signaling_nan()) { |
| 41 | raise_except_if_required(FE_INVALID); |
| 42 | return OutFPBits::quiet_nan().get_val(); |
| 43 | } |
| 44 | |
| 45 | InStorageType x_mant = x_bits.get_mantissa(); |
| 46 | if (InFPBits::FRACTION_LEN > OutFPBits::FRACTION_LEN) |
| 47 | x_mant >>= InFPBits::FRACTION_LEN - OutFPBits::FRACTION_LEN; |
| 48 | return OutFPBits::quiet_nan(x_bits.sign(), |
| 49 | static_cast<OutStorageType>(x_mant)) |
| 50 | .get_val(); |
| 51 | } |
| 52 | |
| 53 | if (x_bits.is_inf()) |
| 54 | return OutFPBits::inf(x_bits.sign()).get_val(); |
| 55 | |
| 56 | constexpr size_t MAX_FRACTION_LEN = |
| 57 | cpp::max(OutFPBits::FRACTION_LEN, InFPBits::FRACTION_LEN); |
| 58 | DyadicFloat<cpp::bit_ceil(MAX_FRACTION_LEN)> xd(x); |
| 59 | return xd.template as<OutType, /*ShouldSignalExceptions=*/true>(); |
| 60 | } |
| 61 | #endif |
| 62 | |
| 63 | return static_cast<OutType>(x); |
| 64 | } |
| 65 | |
| 66 | } // namespace LIBC_NAMESPACE::fputil |
| 67 | |
| 68 | #endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_CAST_H |
| 69 |
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