[PATCH] D119436: RFC: RegAlloc: Avoid repeated calls to freezeReservedRegs

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

freezeReservedRegs is actually called 3-5 times. It's first called in finalizeLowering, again in the allocators, and then again in SILowerSGPRSpills.

We may be able to get away without re-freezing the SGPR spills if we make them all live throughout every block


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