d2dc99cc83
Miri: handling of SNaN inputs in `f*::pow` operations fixes [miri/#4286](https://github.com/rust-lang/miri/issues/4286) and related to rust-lang/rust#138062 and [miri/#4208](https://github.com/rust-lang/miri/issues/4208#issue-2879058184). For the following cases of the powf or powi operations, Miri returns either `1.0` or an arbitrary `NaN`: - `powf(SNaN, 0.0)` - `powf(1.0, SNaN)` - `powi(SNaN, 0)` Also added a macro in `miri/tests/pass/float.rs` which conveniently checks if both are indeed returned from such an operation. Made these changes in the rust repo so I could test against stdlib, since these were impacted some time ago and were fixed in rust-lang/rust#138062. Tested with: ```fish env MIRIFLAGS=-Zmiri-many-seeds ./x miri --no-fail-fast std core coretests -- f32 f64 ``` This was successful. This does take a while, so I recommend using `--no-doc` and separate use of `f32` or `f64` The pr is somewhat split up into 3 main commits, which implement the cases described above. The first commit also introduces the macro, and the last commit is just a global refactor of some things. r? `@RalfJung`
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