Const floating point bitcasts and classification #72449

ecstatic-morse · 2020-05-22T02:06:15Z

Makes the f32 and f64 methods described in #72447 and #72505 unstably const.

src/test/ui/consts/const-float-bits-conv.rs

RalfJung · 2020-05-22T07:27:44Z

LGTM, but I'd also like to know what @oli-obk thinks.

RalfJung · 2020-05-22T20:05:55Z

Would it make sense to also add abs_private and is_finite to the batch of functions that are being constified here? It's just a trivial wrapper around to_bits/from_bits.

Asking for #72440.

ecstatic-morse · 2020-05-23T16:50:56Z

Would it make sense to also add abs_private and is_finite to the batch of functions that are being constified here?

Sure.

oli-obk · 2020-05-26T16:39:17Z

lgtm. Stabilizing these will be blocked on stabilizing floating point types in const fn.

ecstatic-morse · 2020-06-11T21:04:22Z

Going through old PRs today. Is there still desire for this? I'll close if not.

RalfJung · 2020-06-12T07:10:10Z

Sorry, I had no idea this was waiting for my review. @Elinvynia a ping would have helped. :)

Elinvynia · 2020-06-12T07:11:33Z

Unfortunately, we aren't allowed to ping team members.

RalfJung · 2020-06-12T07:18:45Z

@bors r=RalfJung,oli-obk

bors · 2020-06-12T07:18:47Z

📌 Commit 9dadeb3 has been approved by RalfJung,oli-obk

@RalfJung

… r=RalfJung,oli-obk Const floating point bitcasts and classification Makes the `f32` and `f64` methods described in rust-lang#72447 and rust-lang#72505 unstably const. r? @RalfJung

src/test/ui/consts/const-float-bits-conv.rs

src/test/ui/consts/const-float-classify.rs

RalfJung · 2020-08-07T11:15:40Z

@ecstatic-morse sorry for the long silence. Could you rebase and address my latest review? Then I think this can land.

ecstatic-morse · 2020-08-22T21:32:00Z

This is ready to go now. I don't see a path to stabilization for these until we resolve the questions around determinism that are blocking floating point operations inside const fn, but I don't see a reason that nightly users shouldn't be allowed to experiment with them.

src/test/ui/consts/const-float-bits-conv.rs

src/test/ui/consts/const-float-classify.rs

RalfJung · 2020-08-23T14:17:17Z

r=me with the test attributes fixed.

Co-authored-by: Ralf Jung <post@ralfj.de>

RalfJung · 2020-08-23T18:28:26Z

@bors r+

bors · 2020-08-23T18:28:27Z

📌 Commit 130766c has been approved by RalfJung

bors · 2020-08-23T19:15:00Z

⌛ Testing commit 130766c with merge 0ec9459...

bors · 2020-08-23T21:18:00Z

☀️ Test successful - checks-actions, checks-azure
Approved by: RalfJung
Pushing 0ec9459 to master...

Make the following methods of `Duration` unstable const under `duration_const_2`: - `from_secs_f64` - `from_secs_f32` - `mul_f64` - `mul_f32` - `div_f64` - `div_f32` This results in all methods of `Duration` being (unstable) const. Also adds tests for these methods in a const context, moved the test to `library` as part of rust-lang#76268. Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const. Tracking issue: rust-lang#72440

@ecstatic-morse

…orse Make all methods of `Duration` unstably const Make the following methods of `Duration` unstable const under `duration_const_2`: - `from_secs_f64` - `from_secs_f32` - `mul_f64` - `mul_f32` - `div_f64` - `div_f32` This results in all methods of `Duration` being (unstable) const. Moved the tests to `library` as part of rust-lang#76268. Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const. Tracking issue: rust-lang#72440 r? @ecstatic-morse

@ecstatic-morse

…orse Make all methods of `Duration` unstably const Make the following methods of `Duration` unstable const under `duration_const_2`: - `from_secs_f64` - `from_secs_f32` - `mul_f64` - `mul_f32` - `div_f64` - `div_f32` This results in all methods of `Duration` being (unstable) const. Moved the tests to `library` as part of rust-lang#76268. Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const. Tracking issue: rust-lang#72440 r? @ecstatic-morse

@ecstatic-morse

…orse Make all methods of `Duration` unstably const Make the following methods of `Duration` unstable const under `duration_const_2`: - `from_secs_f64` - `from_secs_f32` - `mul_f64` - `mul_f32` - `div_f64` - `div_f32` This results in all methods of `Duration` being (unstable) const. Moved the tests to `library` as part of rust-lang#76268. Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const. Tracking issue: rust-lang#72440 r? @ecstatic-morse

@ecstatic-morse

…orse Make all methods of `Duration` unstably const Make the following methods of `Duration` unstable const under `duration_const_2`: - `from_secs_f64` - `from_secs_f32` - `mul_f64` - `mul_f32` - `div_f64` - `div_f32` This results in all methods of `Duration` being (unstable) const. Moved the tests to `library` as part of rust-lang#76268. Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const. Tracking issue: rust-lang#72440 r? @ecstatic-morse

@ecstatic-morse

…orse Make all methods of `Duration` unstably const Make the following methods of `Duration` unstable const under `duration_const_2`: - `from_secs_f64` - `from_secs_f32` - `mul_f64` - `mul_f32` - `div_f64` - `div_f32` This results in all methods of `Duration` being (unstable) const. Moved the tests to `library` as part of rust-lang#76268. Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const. Tracking issue: rust-lang#72440 r? @ecstatic-morse

rust-highfive assigned RalfJung May 22, 2020

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ecstatic-morse force-pushed the const-float-bitcast branch from 711e244 to c3bb670 Compare May 22, 2020 02:27

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RalfJung mentioned this pull request May 22, 2020

Tracking Issue for constify-ing non-trait Duration methods #72440

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marmeladema mentioned this pull request May 22, 2020

Constify most non-trait Duration methods as described in #72440 #72481

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ecstatic-morse force-pushed the const-float-bitcast branch from c3bb670 to 5f9c391 Compare May 23, 2020 17:38

ecstatic-morse changed the title ~~Const floating point bitcasts~~ Const floating point bitcasts and classification May 23, 2020

ecstatic-morse force-pushed the const-float-bitcast branch from 5f9c391 to 8de4f06 Compare May 23, 2020 18:23

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ecstatic-morse force-pushed the const-float-bitcast branch from 8de4f06 to 9dadeb3 Compare May 23, 2020 19:30

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RalfJung mentioned this pull request Jun 12, 2020

Rollup of 5 pull requests #73271

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ecstatic-morse added 2 commits August 22, 2020 12:28

Add #![feature(const_float_bits_conv)] for f64::to_bits and friends

3cd450e

Add #![feature(const_float_classify)] for f64::classify and friends

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ecstatic-morse force-pushed the const-float-bitcast branch from 426ece4 to d9a5637 Compare August 22, 2020 19:51

Test new floating point bit casts

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ecstatic-morse force-pushed the const-float-bitcast branch from d9a5637 to b65daa7 Compare August 22, 2020 20:35

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Fix compile-flags directive

130766c

Co-authored-by: Ralf Jung <post@ralfj.de>

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Aug 23, 2020

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bors merged commit 0ec9459 into rust-lang:master Aug 23, 2020

CDirkx mentioned this pull request Sep 4, 2020

Make all methods of Duration unstably const #76335

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ecstatic-morse deleted the const-float-bitcast branch October 6, 2020 01:42

Const floating point bitcasts and classification #72449

Const floating point bitcasts and classification #72449

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