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Cranelift: Support tls_value on aarch64 Mach-O #5433
Description
Feature
Support the tls_value instruction on aarch64 Mach-O (darwin)
Benefit
Needed for cg_clif to support TLS on Apple silicon
Implementation
The instruction sequence emitted for this is https://github.com/llvm/llvm-project/blob/ad68586a37e8e23eeb269d03bd28eb46e16bf48c/llvm/test/CodeGen/AArch64/GlobalISel/darwin-tls-call-clobber.ll#L33-L36 (That link is a little confusing because it's a test, but couldn't immediately find a better example).
The x86_64 implementation and aarch64 ELF implementation should provide some guidance as well.
Alternatives
None
Activity
cfallin commentedon Dec 14, 2022
This would be great to have; would you be willing to try putting together a PR? The existing implementation for TLS on ELF aarch64 platforms (see this file and this file, grep for
ElfTlsGetAddrin both; and see this lowering rule) should be a reasonable guide. Happy to answer further questions if you (or anyone) wants to attempt this!nathanwhit commentedon Dec 14, 2022
@cfallin Not sure if you saw, but I actually just posted a PR (#5434)!
(I was preparing the PR when I realized there wasn't an issue for it yet)