[PATCH] D131579: [AArch64][SME] Disable tail-call optimization when streaming mode change or lazy-save may be required.

[Amara Emerson via Phabricator via llvm-commits]

aemerson accepted this revision.
aemerson added inline comments.
This revision is now accepted and ready to land.


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Comment at: llvm/test/CodeGen/AArch64/sme-shared-za-interface.ll:8-10
+; FIXME: The code below if obviously not yet correct, because it should set up
+; a lazy-save buffer before doing the call, and (conditionally) restore it after
+; the call. But this functionality will follow in a future patch.
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sdesmalen wrote:
> aemerson wrote:
> > This is correct as long as you have the shared-za attribute right?
> Sorry, I missed this comment. The code below is only correct if `@private_za_callee` also has `aarch64_pstate_za_shared`, but in this case it isn't, which means that the call to `@private_za_callee` could clobber ZA. It would need the lazy-save mechanism (implemented in D133900)
Right, of course.


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  https://reviews.llvm.org/D131579/new/

https://reviews.llvm.org/D131579