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fc97d2e68b
Implement the UNSIGNED extension type and operations under control of a language feature flag (-funsigned). This is nearly identical to the UNSIGNED feature that has been available in Sun Fortran for years, and now implemented in GNU Fortran for gfortran 15, and proposed for ISO standardization in J3/24-116.txt. See the new documentation for details; but in short, this is C's unsigned type, with guaranteed modular arithmetic for +, -, and *, and the related transformational intrinsic functions SUM & al.
145 lines
6.8 KiB
Fortran
145 lines
6.8 KiB
Fortran
!===-- module/iso_fortran_env_impl.f90 --=--------------------------------===!
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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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! This MODULE implements part of the ISO_FORTRAN_ENV module file, which
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! partially requires linkable symbols for some entities defined
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! (e.g., real_kinds).
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module iso_fortran_env_impl
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implicit none
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private
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! INTEGER types
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integer, parameter, public :: &
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selectedInt8 = selected_int_kind(2), &
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selectedInt16 = selected_int_kind(4), &
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selectedInt32 = selected_int_kind(9), &
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selectedInt64 = selected_int_kind(18),&
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selectedInt128 = selected_int_kind(38), &
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safeInt8 = merge(selectedInt8, selected_int_kind(0), &
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selectedInt8 >= 0), &
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safeInt16 = merge(selectedInt16, selected_int_kind(0), &
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selectedInt16 >= 0), &
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safeInt32 = merge(selectedInt32, selected_int_kind(0), &
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selectedInt32 >= 0), &
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safeInt64 = merge(selectedInt64, selected_int_kind(0), &
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selectedInt64 >= 0), &
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safeInt128 = merge(selectedInt128, selected_int_kind(0), &
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selectedInt128 >= 0)
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integer, parameter, public :: &
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int8 = merge(selectedInt8, merge(-2, -1, selectedInt8 >= 0), &
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digits(int(0,kind=safeInt8)) == 7), &
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int16 = merge(selectedInt16, merge(-2, -1, selectedInt16 >= 0), &
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digits(int(0,kind=safeInt16)) == 15), &
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int32 = merge(selectedInt32, merge(-2, -1, selectedInt32 >= 0), &
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digits(int(0,kind=safeInt32)) == 31), &
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int64 = merge(selectedInt64, merge(-2, -1, selectedInt64 >= 0), &
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digits(int(0,kind=safeInt64)) == 63), &
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int128 = merge(selectedInt128, merge(-2, -1, selectedInt128 >= 0), &
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digits(int(0,kind=safeInt128)) == 127)
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! UNSIGNED types
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integer, parameter, public :: &
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selectedUInt8 = selected_unsigned_kind(2), &
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selectedUInt16 = selected_unsigned_kind(4), &
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selectedUInt32 = selected_unsigned_kind(9), &
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selectedUInt64 = selected_unsigned_kind(18),&
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selectedUInt128 = selected_unsigned_kind(38), &
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safeUInt8 = merge(selectedUInt8, selected_unsigned_kind(0), &
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selectedUInt8 >= 0), &
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safeUInt16 = merge(selectedUInt16, selected_unsigned_kind(0), &
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selectedUInt16 >= 0), &
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safeUInt32 = merge(selectedUInt32, selected_unsigned_kind(0), &
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selectedUInt32 >= 0), &
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safeUInt64 = merge(selectedUInt64, selected_unsigned_kind(0), &
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selectedUInt64 >= 0), &
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safeUInt128 = merge(selectedUInt128, selected_unsigned_kind(0), &
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selectedUInt128 >= 0)
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integer, parameter, public :: &
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uint8 = merge(selectedUInt8, merge(-2, -1, selectedUInt8 >= 0), &
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digits(uint(0,kind=safeUInt8)) == 8), &
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uint16 = merge(selectedUInt16, merge(-2, -1, selectedUInt16 >= 0), &
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digits(uint(0,kind=safeUInt16)) == 16), &
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uint32 = merge(selectedUInt32, merge(-2, -1, selectedUInt32 >= 0), &
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digits(uint(0,kind=safeUInt32)) == 32), &
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uint64 = merge(selectedUInt64, merge(-2, -1, selectedUInt64 >= 0), &
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digits(uint(0,kind=safeUInt64)) == 64), &
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uint128 = merge(selectedUInt128, merge(-2, -1, selectedUInt128 >= 0), &
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digits(uint(0,kind=safeUInt128)) == 128)
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integer, parameter, dimension(*), public :: __builtin_integer_kinds = [ &
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selected_int_kind(0), &
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[(pack([selected_int_kind(k)], &
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selected_int_kind(k) >= 0 .and. &
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selected_int_kind(k) /= selected_int_kind(k-1)), &
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integer :: k=1, 39)]]
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! LOGICAL TYPES
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integer, parameter, public :: &
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logical8 = int8, logical16 = int16, logical32 = int32, logical64 = int64
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integer, parameter, dimension(*), public :: __builtin_logical_kinds = [ &
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pack([logical8], logical8 >= 0), &
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pack([logical16], logical16 >= 0), &
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pack([logical32], logical32 >= 0), &
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pack([logical64], logical64 >= 0) &
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]
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! REAL types
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integer, parameter, public :: &
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selectedReal16 = selected_real_kind(3, 4), & ! IEEE half
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selectedBfloat16 = selected_real_kind(2, 37), & ! truncated IEEE single
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selectedReal32 = selected_real_kind(6, 37), & ! IEEE single
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selectedReal64 = selected_real_kind(15, 307), & ! IEEE double
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selectedReal80 = selected_real_kind(18, 4931), & ! 80x87 extended
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selectedReal64x2 = selected_real_kind(31, 307), & ! "double-double"
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selectedReal128 = selected_real_kind(33, 4931), & ! IEEE quad
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safeReal16 = merge(selectedReal16, selected_real_kind(0,0), &
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selectedReal16 >= 0), &
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safeBfloat16 = merge(selectedBfloat16, selected_real_kind(0,0), &
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selectedBfloat16 >= 0), &
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safeReal32 = merge(selectedReal32, selected_real_kind(0,0), &
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selectedReal32 >= 0), &
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safeReal64 = merge(selectedReal64, selected_real_kind(0,0), &
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selectedReal64 >= 0), &
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safeReal80 = merge(selectedReal80, selected_real_kind(0,0), &
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selectedReal80 >= 0), &
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safeReal64x2 = merge(selectedReal64x2, selected_real_kind(0,0), &
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selectedReal64x2 >= 0), &
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safeReal128 = merge(selectedReal128, selected_real_kind(0,0), &
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selectedReal128 >= 0)
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integer, parameter, public :: &
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real16 = merge(selectedReal16, merge(-2, -1, selectedReal16 >= 0), &
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digits(real(0,kind=safeReal16)) == 11), &
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bfloat16 = merge(selectedBfloat16, merge(-2, -1, selectedBfloat16 >= 0), &
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digits(real(0,kind=safeBfloat16)) == 8), &
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real32 = merge(selectedReal32, merge(-2, -1, selectedReal32 >= 0), &
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digits(real(0,kind=safeReal32)) == 24), &
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real64 = merge(selectedReal64, merge(-2, -1, selectedReal64 >= 0), &
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digits(real(0,kind=safeReal64)) == 53), &
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real80 = merge(selectedReal80, merge(-2, -1, selectedReal80 >= 0), &
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digits(real(0,kind=safeReal80)) == 64), &
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real64x2 = merge(selectedReal64x2, merge(-2, -1, selectedReal64x2 >= 0), &
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digits(real(0,kind=safeReal64x2)) == 106), &
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real128 = merge(selectedReal128, merge(-2, -1, selectedReal128 >= 0), &
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digits(real(0,kind=safeReal128)) == 113)
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integer, parameter, dimension(*), public :: __builtin_real_kinds = [ &
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pack([real16], real16 >= 0), &
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pack([bfloat16], bfloat16 >= 0), &
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pack([real32], real32 >= 0), &
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pack([real64], real64 >= 0), &
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pack([real80], real80 >= 0), &
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pack([real64x2], real64x2 >= 0), &
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pack([real128], real128 >= 0) &
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]
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end module iso_fortran_env_impl
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