[PATCH] D62686: [RISCV] Add support for save/restore of callee-saved registers via libcalls

[Lewis Revill via Phabricator via llvm-commits]

lewis-revill added a comment.

In D62686#1571192 <https://reviews.llvm.org/D62686#1571192>, @asb wrote:

> Hi Lewis, did you evaluate implementing the machine outliner as a more general approach for getting code size savings in this sort of way?


I've added D66210 <https://reviews.llvm.org/D66210> as a very basic implementation of the machine outliner, the results are currently slightly better than this save/restore approach, but I'm not certain the implementation isn't too relaxed about what can be outlined. It's worth noting that enabling both the optimizations at once doesn't diminish the gains you get from the machine outliner.


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  rL LLVM

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https://reviews.llvm.org/D62686