Update aarch64 linux feature detection #1146
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| @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] crypto: "crypto"; | ||
| /// Crypto: AES + PMULL + SHA1 + SHA2 | ||
| /// Cryptographic Extension (AES + PMULL + SHA1 + SHA2-256) |
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As per my comment in rust-lang/rust#84665, we should remove crypto and instead only expose aes and sha2.
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These changes will only work when my changes to rustc make it to the nightly compiler, see rust-lang/rust#84665 Hence no reason to run the CI yet |
…nieu Update list of allowed aarch64 features I recently added these features to std_detect for aarch64 linux, pending [review](rust-lang/stdarch#1146). I have commented any features not supported by LLVM 9, the current minimum version for Rust. Some (PAuth at least) were renamed between 9 & 12 and I've left them disabled. TME, however, is not in LLVM 9 but I've left it enabled. See rust-lang/stdarch#993
Update list of allowed aarch64 features I recently added these features to std_detect for aarch64 linux, pending [review](rust-lang/stdarch#1146). I have commented any features not supported by LLVM 9, the current minimum version for Rust. Some (PAuth at least) were renamed between 9 & 12 and I've left them disabled. TME, however, is not in LLVM 9 but I've left it enabled. See rust-lang/stdarch#993
This commit doesn't add support for features not available in LLVM 12
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I missed this in my testing but armv7 still requires crypto for the intrinsics. This was fixed in llvm/llvm-project@b8baa2a#diff-e65dd2f7194df68bc6e9b754449ae241a6717f77ca1a28ee9479990ffe292049R7230 but that commit needs to make it to the minimum LLVM version before it can be removed fully |
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We can cherry-pick that commit into rust-lang/llvm-project and then update the llvm-project submodule in rust-lang/rust. |
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Hmm on second thought that might be a breaking change that would prevent cross-lang LTO with Clang 12. So in the end we will most likely have to wait for LLVM 13. |
All features supported by auxv (see https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h) / cpuinfo (https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/cpuinfo.c) and in LLVM 12 are added.
See
llvm-project/llvm/lib/Target/AArch64/AArch64.tdfor the LLVM feature names and dependencies. We've done a few passes for silly cross-referencing mistakes ourselves so I'm reasonably confident in its accuracy.I had a couple notes after working on this:
See #993
See also: rust-lang/rust#84665