Module env

Support for rounding directions and status flags as specified by IEEE 754.

Rust does not support the floating point environment so rounding mode is passed as an argument and status flags are returned as part of the result. There is currently not much support for this; most existing ports from musl use a form of force_eval! to raise exceptions, but this has no side effects in Rust. Further, correct behavior relies on elementary operations making use of the correct rounding and raising relevant exceptions, which is not the case for Rust.

This module exists so no functionality is lost when porting algorithms that respect floating point environment, and so that some functionality may be tested (that which does not rely on side effects from elementary operations). Full support would require wrappers around basic operations, but there is no plan to add this at the current time.

Structs

FpResult

A value combined with a floating point status.

Status

IEEE 754 exception status flags.

Enums

Round

IEEE 754 rounding mode, excluding the optional roundTiesToAway version of nearest.