[PATCH] D62653: [Mips][DSP] Fix physregs incorrectly marked as dead.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

> Machine verifier would fail if only RDDSP was used without some other instruction previously defining a register

If you're going to allow calling llvm.mips.rddsp without some other instruction defining the register, you need to mark the registers live-in to the function.  Marking them "undef" means you aren't using the value in the register, which could cause issues later.


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  https://reviews.llvm.org/D62653/new/

https://reviews.llvm.org/D62653