Add std_detect::detect::features() API that returns iterator of target-features and reject unstable features in feature-detection macros#739
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gnzlbg merged 5 commits intorust-lang:masterfrom Sep 16, 2019
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Do you plan to rebase this? I could use something like this to map the env var content to the features. |
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Yep, I'll merge this today. |
lu-zero
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Sep 16, 2019
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It looks fine and I'd use it
Contributor
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It rebases cleanly but if I try to build it I get: |
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Damn I forgot about this. |
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Actually I had a problem with my local repo and origin/master was pointing to the wrong place, so a rebase isn't immediate :) (if you have time to rebase and push would be great) |
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If it survives I guess it should be good to go pending some shuffling/amending. |
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Gonna update stdarch upstream and do a crater run. There might be code in the wild accidentally relying on some of the unstable features. |
oconnor663
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rust-lang#739 added per-feature stabilization of runtime CPU feature detection. In so doing, it de-stabilized some detection features that had been stable since Rust 1.27.0, breaking some published crates (on nightly). This commit re-stabilizes the subset of AVX-512 detection features that were included in 1.27.0 (that is, the pre-Ice-Lake subset). Other instruction sets (MMX in particular) remain de-stabilized, pending a decision about whether should ever stabilize them. See rust-lang/rust#68905.
Amanieu
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Mar 19, 2020
…#842) * re-stabilize the AVX-512 features that were stabilized in Rust 1.27.0 #739 added per-feature stabilization of runtime CPU feature detection. In so doing, it de-stabilized some detection features that had been stable since Rust 1.27.0, breaking some published crates (on nightly). This commit re-stabilizes the subset of AVX-512 detection features that were included in 1.27.0 (that is, the pre-Ice-Lake subset). Other instruction sets (MMX in particular) remain de-stabilized, pending a decision about whether should ever stabilize them. See rust-lang/rust#68905. * add a comment explaining feature detection stability * adjust stabilizations to match most recent proposal rust-lang/rust#68905 (comment)
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This PR implements an unstable
features()function instd::detectthat returns an iterator over the target features, returning a tuple of the target-feature name, and whether it is enabled or disabled in the current host.This can be used to implement a solution to rust-lang/rust#54688 using our own run-time feature detection system.
The refactor required to implement this also allows us to close #667