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Add support for printing hex float syntax#483
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tgross35 merged 3 commits intorust-lang:masterfrom Jan 30, 2025
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Cc @quaternic, more parsing and printing |
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Looks like indicatif needs a temporary pin #484 |
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| const fn parse_any(s: &str, bits: u32, sig_bits: u32) -> u128 { | ||
| /// Parse any float from hex to its bitwise representation. | ||
| /// | ||
| /// `nan_repr` is passed rather than constructed so the platform-specific NaN is returned. |
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Is it necessary to return specifically fN::NAN? Rather than, say, the quiet NaN with 0 payload.
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I had this for bitwise equality at some point, but I since removed that path. I'll clean this up.
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Removed. I also moved the new struct to hex_float so it is usable for debug printing within libm.
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crates/libm-test/src/num.rs
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| } else { | ||
| "1." | ||
| }; | ||
| let exp_sign = if exponent >= 0 { "+" } else { "" }; |
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To always print the exponent sign, you could use the + format flag (https://doc.rust-lang.org/std/fmt/index.html#sign0)
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🤯 I don't think I ever knew about that option, thanks
This isn't very useful for constants since the trait constants are available, but does enable roundtripping via hex float syntax.
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Add support for printing hex float syntax
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Update the
hf*functions to be able to parse infinities and NANs, then add a wrapper type that formats with the hex float syntax.For now this is only being used in
util, but in a followup I will somehow merge this into the existingHextrait so this is displayed from test output.