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rustc_middle: ImmTy's Display implementation adds a weird-looking suffix to special floating point values. #118221

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eduardosm opened this issue Nov 23, 2023 · 1 comment · Fixed by #118271
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rustc_middle: ImmTy's Display implementation adds a weird-looking suffix to special floating point values. #118221

eduardosm opened this issue Nov 23, 2023 · 1 comment · Fixed by #118271
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A-floating-point Area: Floating point numbers and arithmetic A-pretty Area: Pretty printing (including `-Z unpretty`) C-bug Category: This is a bug. C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@eduardosm
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When printing an ImmTy that contains an special floating point value such as infinity or NaN, it will add an f32 or f64 suffix, making it look like Inff32 or NaNf32, which does not look very pretty.

First observed in rust-lang/miri#3185 (comment).
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Nov 23, 2023
@eduardosm eduardosm mentioned this issue Nov 23, 2023
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@RalfJung
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This should probably be Inf_f32 or so instead.

The code for that is here:

rust/compiler/rustc_middle/src/ty/print/pretty.rs

Lines 1479 to 1484 in 15f2156

ty::Float(ty::FloatTy::F32) => {
p!(write("{}f32", Single::try_from(int).unwrap()))
}
ty::Float(ty::FloatTy::F64) => {
p!(write("{}f64", Double::try_from(int).unwrap()))
}

@compiler-errors compiler-errors mentioned this issue Nov 24, 2023
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@bors bors closed this as completed in a663bb9 Nov 25, 2023
rust-timer added a commit to rust-lang-ci/rust that referenced this issue Nov 25, 2023
@rust-timer
Unrolled build for rust-lang#118271
3bff74d 
Rollup merge of rust-lang#118271 - compiler-errors:float, r=RalfJung

Separate `NaN`/`Inf` floats with `_`

r? RalfJung

Fixes rust-lang#118221

No test 🤷 unless you know a good way to print an `ImmTy` in a unit test?
@fmease fmease added A-pretty Area: Pretty printing (including `-Z unpretty`) C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. A-floating-point Area: Floating point numbers and arithmetic and removed needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. labels Nov 26, 2023
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A-floating-point Area: Floating point numbers and arithmetic A-pretty Area: Pretty printing (including `-Z unpretty`) C-bug Category: This is a bug. C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Separate NaN/Inf floats with _ compiler-errors/rust
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@RalfJung @eduardosm @fmease @rustbot