[−][src]Crate floatconv
Floating point conversion functions.
Software and hardware implementations
The soft
module provides a software implementation of all
conversion functions, for targets which do not provide them natively.
These are implemented without any floating point operations, so are also
useful for software that needs to avoid using floating point hardware.
The fast
module provides a fast implementation of all conversion
functions by making use of native floating point instructions where
possible.
Rounding mode
- Functions named
_round
round the integer to the closest possible floating point number, and breaks ties to even. - Functions named
_truncate
truncate the result, which means they round towards zero. - Functions without a rounding mode in their name do not round. These conversions are always lossless.
Speed
For conversions that aren't available natively, the software
implementations in this crate seem to be both faster and
smaller in almost all cases compared to the ones currently
used by x as f64
or x as f64
(from the compiler builtins
runtime support library).
Work in progress
This crate is usable, but still incomplete:
- There's no support for converting to integers yet.
- Native conversions are only available on ARM (32- and 64-bit) and x86 (32- and 64-bit).
- The truncating functions do not (yet) use any native floating point instructions.
Modules
fast | Fast implementations of all conversion functions. |
soft | Software implementations of all conversion functions that don't use any floating point instructions. |