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README
softfloat-hs - Haskell bindings for SoftFloat.
copyright (c) Ben Selfridge, Galois Inc. 2018
This library consists primarily of a Haskell interface to John Hauser's SoftFloat library (http://www.jhauser.us/arithmetic/SoftFloat.html). It provides a pure interface to the functions in that library; while the C library is actually impure, reading and writing to global variables (rounding mode, exceptions), the Haskell functions have a pure interface, and those variables that were global in the original library are captured as input arguments and additional outputs of each function.
Installation
Step 1: Install softfloat
SoftFloat is not too complicated to install, but it is best to build a dynamic
library so that softfloat-hs can be loaded into ghci (which does not support
statically linked C libraries). For convenience, we provide SoftFloat itself as a
submodule, as well as a Makefile to install it on Linux/OSX:
$ git submodule update --init --recursive
$ make
$ sudo make install
Step 2: Build softfloat-hs
With stack:
stack build
With cabal new-build:
cabal new-build softfloat-hs
Step 3: Test softfloat-hs
stack ghci
> let Result x flags = ui32ToF32 RoundNearEven 23
> :m +Numeric
> showHex x ""
"41b80000"
> flags
ExceptionFlags {inexact = False, underflow = False, overflow = False, infinite = False, invalid = False}
> let Result y flags = ui32ToF32 RoundNearEven 3
> showHex y ""
"40400000"
> let Result z flags = f32Div RoundNearEven x y
> showHex z ""
"40f55555"
> flags
ExceptionFlags {inexact = True, underflow = False, overflow = False, infinite = False, invalid = False}
Requirements
The following are a list of mandatory and secondary requirements for softfloat-hs.
Mandatory Requirements
- Must provide a "pure" Haskell interface to all of the SoftFloat functions.
- Must make explicit ALL global variables involved.
Secondary Requirements
- Support 80-bit and 128-bit operations.
Current Status
The library is functional, although a few global variables are not yet captured (whether underflow is detected before or after rounding, for example).
Known issues
Building softfloat on Darwin currently has some issues -- for whatever reason, some of the conversion functions to not work correctly in some of the corner cases (f32ToI32 in particular). We are investigating this currently.
Other information
- contact: [email protected]