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Wed Apr 25 17:06:35 2018 UTC (17 months, 3 weeks ago) by jhr
File size: 2538 byte(s)
Wed Apr 25 17:06:35 2018 UTC (17 months, 3 weeks ago) by jhr
File size: 2538 byte(s)
Use RealConst.t representation in FLINT and CPS IRs.
(* unsigned-const-arith-sig.sml * * Operations for constant-folding unsigned operations on constant integers. * * COPYRIGHT (c) 2017 John Reppy (http://cs.uchicago.edu/~jhr) * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * This code is part of the SML Compiler Utilities, which can be found at * * https://github.com/JohnReppy/sml-compiler-utils *) signature UNSIGNED_CONST_ARITH = sig (* we use arbitrary-precision integers to represent constant values *) type t = IntInf.int (* bit-widths are represented as integers *) type width = int (* narrow an unsigned value to the range 0..2^WID^-1; depending on the semantics * of the implementation, this function may raise Overflow on values that are * outside the range -2^(WID-1)^..2^(WID)^-1. *) val uNarrow : width * t -> t (* converts values in range -2^(WID-1)^..2^(WID-1)^-1 to 0..2^(WID)^-1 *) val toUnsigned : width * t -> t val uAdd : width * t * t -> t val uSub : width * t * t -> t val uMul : width * t * t -> t val uDiv : width * t * t -> t val uMod : width * t * t -> t val uShL : width * t * t -> t (* shift left *) val uShR : width * t * t -> t (* shift right (zero-extend) *) (* 2's complement of argument as unsigned value *) val uNeg : width * t -> t (* unsigned comparisons, which correctly handle negative arguments *) val uLess : width * t * t -> bool val uLessEq : width * t * t -> bool end
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