364b20e5f8
powf, powi: point out SNaN non-determinism The non-determinism has two sources: - LLVM reserves the right to treat signaling NaNs as-if they were quiet, so it may fold `powf(x, 0)` to `1` even if `x` might be a signaling NaN. - Some libm `pow` implementations (e.g. the one in musl) don't implement the signaling NaN special-case. See https://rust.godbolt.org/z/chsbv5v4d. Cc `@tgross35` `@Amanieu` |
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| Cargo.toml | ||