Rollup of 15 pull requests #22281
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Rollup of 15 pull requests #22281
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According to @dotdash it enables more aggressive optimizations from LLVM
This PR is an optimization of the `FromIterator` implementation of `Vec` Benchmark: https://gist.github.com/alexcrichton/03d666159a28a80e7c70 Before: test macro_repeat1 ... bench: 57 ns/iter (+/- 1) test macro_repeat2 ... bench: 56 ns/iter (+/- 1) test map_clone1 ... bench: 828 ns/iter (+/- 13) test map_clone2 ... bench: 828 ns/iter (+/- 8) test repeat1 ... bench: 1104 ns/iter (+/- 10) test repeat2 ... bench: 1106 ns/iter (+/- 11) After: test macro_repeat1 ... bench: 75 ns/iter (+/- 21) test macro_repeat2 ... bench: 59 ns/iter (+/- 31) test map_clone1 ... bench: 34 ns/iter (+/- 22) test map_clone2 ... bench: 52 ns/iter (+/- 21) test repeat1 ... bench: 34 ns/iter (+/- 11) test repeat2 ... bench: 33 ns/iter (+/- 12) The idea behind this optimization is to avoid all bounds checks for space already allocated into the vector. This may involve running the iterator twice, but the first run of the iterator should be optimizable to a memcpy or memset if possible. The same treatment can in theory be applied to `Vec::extend` but the benchmarks for that currently get *worse* if the change is applied. This appears to be some LLVM optimizations going awry but it's seems prudent to land at least the `collect` portion beforehand.
It is not totally clear if we should just use whitespace, or if the full unicode word-breaking algorithm is more correct. If there is demand we can reconsider this decision (and consider the precise algorithm to use in detail). cc rust-lang#15628.
In `std::f32` and `std::f64`: - `MIN_VALUE` → `MIN` - `MAX_VALUE` → `MAX` - `MIN_POS_VALUE` → `MIN_POSITIVE` This matches the corresponding integer constants. [breaking-change]
Also add address of IRC server. Addresses rust-lang#22249.
This partially resolves rust-lang#22243.
This resolves rust-lang#22243, at least for one-letter variable names.
Remove incorrect claim, add example, reformat and re-word. Fixes rust-lang#22266
Rollup merge (373cbab) of PR rust-lang#20723 accidentally reverted a portion of commit 8327bcc which shifted `slicing_syntax` from Active to Accepted.
Added a second note about keeping the reference.md list up-to-date to the bottom of the list, since not everyone (including me) reads the big comment at the top of it. :) Ensured that the feature gate list in reference.md is kept in alphabetical order.
if found on the `main()` function. This lets you write tests that live in `compile-fail` but are expected to compile successfully. This is handy when you have many small variations on a theme that you want to keep together, and you are just testing the type checker, not the runtime semantics.
This PR is an optimization of the `FromIterator` implementation of `Vec` Benchmark: https://gist.github.com/alexcrichton/03d666159a28a80e7c70 Before: test macro_repeat1 ... bench: 57 ns/iter (+/- 1) test macro_repeat2 ... bench: 56 ns/iter (+/- 1) test map_clone1 ... bench: 828 ns/iter (+/- 13) test map_clone2 ... bench: 828 ns/iter (+/- 8) test repeat1 ... bench: 1104 ns/iter (+/- 10) test repeat2 ... bench: 1106 ns/iter (+/- 11) After: test macro_repeat1 ... bench: 75 ns/iter (+/- 21) test macro_repeat2 ... bench: 59 ns/iter (+/- 31) test map_clone1 ... bench: 34 ns/iter (+/- 22) test map_clone2 ... bench: 52 ns/iter (+/- 21) test repeat1 ... bench: 34 ns/iter (+/- 11) test repeat2 ... bench: 33 ns/iter (+/- 12) The idea behind this optimization is to avoid all bounds checks for space already allocated into the vector. This may involve running the iterator twice, but the first run of the iterator should be optimizable to a memcpy or memset if possible. The same treatment can in theory be applied to `Vec::extend` but the benchmarks for that currently get *worse* if the change is applied. This appears to be some LLVM optimizations going awry but it's seems prudent to land at least the `collect` portion beforehand.
According to @dotdash it enables more aggressive optimizations from LLVM
It is not totally clear if we should just use whitespace, or if the full unicode word-breaking algorithm is more correct. If there is demand we can reconsider this decision (and consider the precise algorithm to use in detail). cc rust-lang#15628.
In `std::f32` and `std::f64`: - `MIN_VALUE` → `MIN` - `MAX_VALUE` → `MAX` - `MIN_POS_VALUE` → `MIN_POSITIVE` This matches the corresponding integer constants. [breaking-change]
…akis Removes the link to the rust-dev mailing list in the bug report submission page and also adds the address of the IRC server (`irc.mozilla.org`). Addresses rust-lang#22249.
…tsakis Remove incorrect claim, add example, reformat and re-word. Fixes rust-lang#22266
…cepted, r=nikomatsakis Rollup merge (373cbab) of PR rust-lang#20723 accidentally reverted a portion of commit 8327bcc which shifted `slicing_syntax` from Active to Accepted.
This resolves rust-lang#22243 for the single-letter variables that I could grep. Some occurences could not be replaced.
…ate-list, r=steveklabnik Added all active features to the list in reference.md. Added a second note about keeping the reference.md list up-to-date to the bottom of the list, since not everyone (including me) reads the big comment at the top of it. :) Ensured that the feature gate list in reference.md is kept in alphabetical order.
…sakis Add `#[rustc_error]` annotation, which causes trans to signal an error if found on the `main()` function. This lets you write tests that live in `compile-fail` but are expected to compile successfully. This is handy when you have many small variations on a theme that you want to keep together, and you are just testing the type checker, not the runtime semantics. r? @pnkfelix
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(rust_highfive has picked a reviewer for you, use r? to override) |
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⌛ Testing commit ee96742 with merge 21a3d9e... |
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💔 Test failed - auto-linux-64-nopt-t |
... as it is no longer needed.
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@bors: r+ 7ac46el |
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🙀 You have the wrong number! Please try again with |
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@bors p=1 |
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⌛ Testing commit 7ac46e1 with merge 5d7625a... |
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💔 Test failed - auto-linux-64-opt |
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Closing in favor of a bigger rollup |
alexcrichton
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Feb 19, 2015
This overlaps with rust-lang#22276 (I left make check running overnight) but covers a number of additional cases and has a few rewrites where the clones are not even necessary. This also implements `RandomAccessIterator` for `iter::Cloned` cc @steveklabnik, you may want to glance at this before rust-lang#22281 gets the bors treatment
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wordsfor now. #22253, Remove_VALUEfrom the float extremes constants. #22254, Remove link to mailing list in bug report submission page #22263, Improve documentation forSelect::new(). #22268, Re-word paragraph about enums and equality #22271, Re-tagslicing_syntaxasAccepted. #22274, Map clone #22276, Added all active features to the list in reference.md. #22277, Add#[rustc_error]annotation, which causes trans to signal an error #22278, Fix small copy-paste typo #22280