================ @@ -0,0 +1,119 @@ +<!--===- docs/Unsigned.md + + 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 + +--> + +# Fortran Extensions supported by Flang + +```{contents} +--- +local: +--- +``` + +For better compatibility with GNU Fortran and Sun Fortran, +this compiler supports an option (`-funsigned`) that enables +the `UNSIGNED` data type, constants, intrinsic functions, +its use with intrinsic operations and `SELECT CASE`, and C +language interoperability. + +## `UNSIGNED` type + +`UNSIGNED` is a numeric type with the same kinds as `INTEGER`. +It may appear as a type-spec in any context, including +a type declaration statement, a type-decl in an array +constructor or `ALLOCATE` statement, `IMPLICIT`, or a +function statement's prefix. + +`UNSIGNED` constants are nonempty strings of decimal digits +followed by the letter `U` and optionally a kind suffix with +an underscore. + +## `UNSIGNED` operations + +`UNSIGNED` operands are accepted for unary negation (`-`), +the basic four binary arithmetic intrinsic operations `+`, `-`, `*`, and `/`, +and for numeric relational operators. +The power operator `**` does not accept `UNSIGNED` operands. + ---------------- vdonaldson wrote:
Note that J3 24-116.txt says [sic]: `The unary - operator shall not be applied to. UNSIGNED values.` https://github.com/llvm/llvm-project/pull/113504 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
