[PATCH] D88701: [AArch64] Prefer prologues with sp adjustments merged into stp/ldp for WinCFI

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Yes, the dependency chain of sp is one instruction longer, and there's one extra arithmetic op on some cores.  Those double if you count the epilogue that has the same issue.

Not sure how significant that is in practice, but I suspect it's observable in code with a lot of small functions.

Maybe it makes sense to distinguish between -O2 vs. -Os here?


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