[PATCH] D156491: [RA] Split a virtual register in cold blocks if it is not assigned preferred physical register

[Guozhi Wei via Phabricator via llvm-commits]

Carrot added a comment.

In D156491#4652598 <https://reviews.llvm.org/D156491#4652598>, @hans wrote:

> We're seeing binary size increases in Chromium, in particular for Android and Fuchsia where size is critical: https://crbug.com/1488374
> Is that an inherent property of this change, and could it be scaled back for optsize functions for example?

This change is driven by the cost of using a single physical register and split a register. As most cost computations in RA, these are based on the weighted number of instructions (dynamic number of instructions or performance), static number of instructions is not considered. So its impact to code size is random. You can use -split-threshold-for-reg-with-hint=0 to disable this optimization.


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https://reviews.llvm.org/D156491