my rust fork
https://www.rust-lang.org
105cd79578
Many routines have some form of handling for rounding mode and floating point exceptions, which are implemented via a combination of stubs and `force_eval!` use. This is suboptimal, however, because: 1. Rust does not interact with the floating point environment, so most of this code does nothing. 2. The parts of the code that are not dead are not testable. 3. `force_eval!` blocks optimizations, which is unnecessary because we do not rely on its side effects. We cannot ensure correct rounding and exception handling in all cases without some form of arithmetic operations that are aware of this behavior. However, the cases where rounding mode is explicitly handled or exceptions are explicitly raised are testable. Make this possible here for functions that depend on `math::fenv` by moving the implementation to a nonpublic function that takes a `Round` and returns a `Status`. Link: https://github.com/rust-lang/libm/issues/480 |
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