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Optimize BitIter #65425

Merged
merged 2 commits into from
Oct 16, 2019
Merged

Optimize BitIter #65425

merged 2 commits into from
Oct 16, 2019

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nnethercote
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A minor speed improvement.

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r? @zackmdavis

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 15, 2019
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@bors r+

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bors commented Oct 15, 2019

📌 Commit f5bfffd has been approved by zackmdavis

@bors 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-review Status: Awaiting review from the assignee but also interested parties. labels Oct 15, 2019
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I added another commit, one that benefits from the faster BitIter. But I didn't see the r+ before that happened. I have now removed the additional commit; I will do it in a different PR.

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@bors r=zackmdavis

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bors commented Oct 15, 2019

📌 Commit f5bfffd has been approved by zackmdavis

Centril added a commit to Centril/rust that referenced this pull request Oct 15, 2019
@Centril
Rollup merge of rust-lang#65425 - nnethercote:optimize-BitIter, r=zac…
ebead31 
…kmdavis

Optimize `BitIter`

A minor speed improvement.
@Centril Centril mentioned this pull request Oct 15, 2019
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Centril commented Oct 15, 2019

Failed in #65430 (comment), @bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 15, 2019
@nnethercote
Add BitIter::new().
2918a7d 
This factors out some duplicated code.
@nnethercote
Optimize BitSet iteration.
60851b0 
This commit removes an `Option` check in `BitIter::next()`, avoids
calling `trailing_zeros()` when it's not necessary, and avoids the need
for `enumerate()`. This gives a tiny (0.2%) instruction count win on a
couple of benchmarks.

The commit also adds some comments, which is good because this iteration
code is moderately complex.
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I mistakenly thought it was ok for unsigned integers to wrap with +. wrapping_add fixes the problem.

@bors r=zackmdavis

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bors commented Oct 15, 2019

📌 Commit 60851b0 has been approved by zackmdavis

@bors 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 Oct 15, 2019
tmandry added a commit to tmandry/rust that referenced this pull request Oct 15, 2019
@tmandry
Rollup merge of rust-lang#65425 - nnethercote:optimize-BitIter, r=zac…
6416079 
…kmdavis

Optimize `BitIter`

A minor speed improvement.
@tmandry tmandry mentioned this pull request Oct 15, 2019
Merged
bors added a commit that referenced this pull request Oct 15, 2019
@bors
Auto merge of #65454 - tmandry:rollup-0k6jiik, r=tmandry
f54911c 
Rollup of 14 pull requests

Successful merges:

 - #64603 (Reducing spurious unused lifetime warnings.)
 - #64623 (Remove last uses of gensyms)
 - #65235 (don't assume we can *always* find a return type hint in async fn)
 - #65242 (Fix suggestion to constrain trait for method to be found)
 - #65265 (Cleanup librustc mir err codes)
 - #65293 (Optimize `try_expand_impl_trait_type`)
 - #65307 (Try fix incorrect "explicit lifetime name needed")
 - #65308 (Add long error explanation for E0574)
 - #65353 (save-analysis: Don't ICE when resolving qualified type paths in struct members)
 - #65389 (Return `false` from `needs_drop` for all zero-sized arrays.)
 - #65402 (Add troubleshooting section to PGO chapter in rustc book.)
 - #65425 (Optimize `BitIter`)
 - #65438 (Organize `never_type`  tests)
 - #65444 (Implement AsRef<[T]> for List<T>)

Failed merges:

 - #65390 (Add long error explanation for E0576)

r? @ghost
@bors bors merged commit 60851b0 into rust-lang:master Oct 16, 2019
@nnethercote nnethercote deleted the optimize-BitIter branch October 16, 2019 18:41
@nnethercote nnethercote mentioned this pull request Oct 16, 2019
Merged
bors added a commit that referenced this pull request Oct 16, 2019
@bors
Auto merge of #65480 - nnethercote:rm-iterate_until_fixed_size, r=<try>
e320fe5 
Speed up `LexicalResolve::expansion()`

A couple of improvements that speed up `unicode_normalization` by about 4%. The first commit was enabled by the improvements to `BitSet` iteration in #65425.

r? @nikomatsakis
tmandry added a commit to tmandry/rust that referenced this pull request Oct 18, 2019
@tmandry
Rollup merge of rust-lang#65480 - nnethercote:rm-iterate_until_fixed_…
8cb6225 
…size, r=nikomatsakis

Speed up `LexicalResolve::expansion()`

A couple of improvements that speed up `unicode_normalization` by about 4%. The first commit was enabled by the improvements to `BitSet` iteration in rust-lang#65425.

r? @nikomatsakis
tmandry added a commit to tmandry/rust that referenced this pull request Oct 18, 2019
@tmandry
Rollup merge of rust-lang#65480 - nnethercote:rm-iterate_until_fixed_…
7cc5c5a 
…size, r=nikomatsakis

Speed up `LexicalResolve::expansion()`

A couple of improvements that speed up `unicode_normalization` by about 4%. The first commit was enabled by the improvements to `BitSet` iteration in rust-lang#65425.

r? @nikomatsakis
tmandry added a commit to tmandry/rust that referenced this pull request Oct 18, 2019
@tmandry
Rollup merge of rust-lang#65480 - nnethercote:rm-iterate_until_fixed_…
4a76e6d 
…size, r=nikomatsakis

Speed up `LexicalResolve::expansion()`

A couple of improvements that speed up `unicode_normalization` by about 4%. The first commit was enabled by the improvements to `BitSet` iteration in rust-lang#65425.

r? @nikomatsakis
tmandry added a commit to tmandry/rust that referenced this pull request Oct 18, 2019
@tmandry
Rollup merge of rust-lang#65480 - nnethercote:rm-iterate_until_fixed_…
c6bb960 
…size, r=nikomatsakis

Speed up `LexicalResolve::expansion()`

A couple of improvements that speed up `unicode_normalization` by about 4%. The first commit was enabled by the improvements to `BitSet` iteration in rust-lang#65425.

r? @nikomatsakis
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