dmgreen added a comment.
In D141411#4042891 <https://reviews.llvm.org/D141411#4042891>, @lenary wrote:
> Can we check this logic, especially around adding both AEK_SVE and AEK_SVE2
> in the `AARCH64_ARCH` descriptions, this means that `-march=armv9-a+nosve2`
> still can generate sve instructions. I'm not entirely sure of the intended
> behaviour there, especially as sve2 should maybe imply sve by other means
> (iirc, there's a place higher up in AArch64TargetParser.def with the implied
> features?)
Hello. I would expect `-march=armv9-a+nosve2` to still enable sve, and as far
as I can tell (correct me if I'm wrong!) that is how this worked both before
and after this patch. There is some code in the driver that already adds +sve
and +sve2 TargetFeatures if the architecture is v9a. A lot of that code in the
Driver shouldn't really be in their though, as it won't apply to
`target("arch=..")` attributes correctly.
Repository:
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https://reviews.llvm.org/D141411/new/
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