[PATCH] D112133: [DebugInfo][Instr] Track subregisters across stack spills/restores

[Jeremy Morse via Phabricator via llvm-commits]

jmorse added a comment.

In D112133#3077525 <https://reviews.llvm.org/D112133#3077525>, @djtodoro wrote:

> I see... But I guess it can give us a decent location coverage improvement, especially for targets such as x86, right?

Probably yes -- it's hard to say in advance because InstrRef is better at handling spill locations. It can follow values across both the stack and in registers, while VarLocBasedLDV has to commit to either following a spill or staying in a register. Definitely worth prototyping though.

Note that I'm cooking up a plan to turn instr-ref on by default for X86 for LLVM14, although it's not a certain thing.


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