[PATCH] D156767: [AArch64] [BranchRelaxation] Optimize for hot code size in AArch64 branch relaxation

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

In D156767#4549141 <https://reviews.llvm.org/D156767#4549141>, @dhoekwater wrote:

> Here's a breakdown of the cases:
> [...]

It'd be great to fold this information to the summary.

> Hot -> Cold [x16 not free, but others are]

but there is an unused register


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