Document aarch64 target_feature options
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@ehuss This and #1061 are no longer blocked on stabilisation - we're currently merging PRs for this (see rust-lang/rust#86941 (comment)) |
adamgemmell
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Thanks for putting this together! I can't find how to verify the implied feature mappings. How can I validate those? I see the feature mapping on the rust side, but those don't seem to completely encompass the mappings here. The x86 side has the implicit mappings defined (here), but I can't find the same thing for the aarch64 side. |
ehuss
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@ehuss I've been using https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/AArch64/AArch64.td combined with the "to_llvm_features" mapping you linked. The array of features at the end of each def provides the implied mapping. I can see X86.td also exists with this information, not really sure why it's duplicated there. The two sources don't seem to conflict at least. |
ehuss
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Update books ## reference 8 commits in 9d289c05fce7254b99c6a0d354d84abb7fd7a032..0a2fe6651fbccc6416c5110fdf5b93fb3cb29247 2022-02-23 08:58:20 -0800 to 2022-03-15 09:32:25 -0700 - Documentation PR for cfg_panic (rust-lang/reference#1157) - Document aarch64 `target_feature` options (rust-lang/reference#1102) - Try to clarify destructor not being run scenario. (rust-lang/reference#1107) - Add undocumented Punctuation token Tilde `~` (rust-lang/reference#1149) - update UB list for safe target_feature (rust-lang/reference#1050) - Update const_eval.md for feature stabilization (rust-lang/reference#1166) - Remove `.intel_syntax`/`.att_syntax` support entirely. - Fix `.intel_syntax` directive ## book 3 commits in 3f255ed40b8c82a0434088568fbed270dc31bf00..036e88a4f135365de85358febe5324976a56030a 2022-02-27 21:26:12 -0500 to 2022-03-04 21:53:33 -0500 - Fix some links and small wordings - Snapshot of chapter 19 for nostarch - Clarify fully-qualified syntax explanation ## rust-by-example 2 commits in 2a928483a20bb306a7399c0468234db90d89afb5..d504324f1e7dc7edb918ac39baae69f1f1513b8e 2022-02-28 11:36:59 -0300 to 2022-03-07 09:26:32 -0300 - Fixed extra indentation at line 43 in Phantom Testcase example. (rust-lang/rust-by-example#1515) - Typo fixed in description of inline ASM cpuid function (rust-lang/rust-by-example#1514) ## rustc-dev-guide 3 commits in 32f2a5b..0e4b961 2022-03-01 10:45:24 -0600 to 2022-03-14 08:40:37 -0700 - update winget install instructions to ensure proper packages are installed (-e for --exact, and full package names to ensure arbitrary packages from the msstore source aren't installed) - Add missing rustdoc tests explanations - Fix incorrectly escaped backtick
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Draft documentation update rust-lang/rust#90620
Of note is the fact that I haven't documented the "v8.Xa" target features in order to discourage their use. It's much better to use the more granular target features available.