[PATCH] D129135: [doc][ReleaseNotes] Document AArch64 SVE ABI fix from D127209

Tue Jul 5 02:57:49 PDT 2022

peterwaller-arm added a comment.

In D129135#3629860 <https://reviews.llvm.org/D129135#3629860>, @peterwaller-arm wrote:

> but I can't identify a specific worse issue at present.

Thinking a little harder, one breaking case is where a callee-compiled-with-wrong-logic looks at its signature, concludes it does not need to preserve the regs (because the SVE type is in the 9th argument, for example), but is called by a different compiler which correctly implements the ABI, so neither side preserves registers which require preservation.

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https://reviews.llvm.org/D129135