[PATCH] D66991: [PowerPC] Fix SH field overflow issue

[Jinsong Ji via Phabricator via llvm-commits]

jsji added a comment.

In D66991#1679267 <https://reviews.llvm.org/D66991#1679267>, @jsji wrote:

> You are right, we should make sure we meet SSA constraint when writing the MIR for passes before RA.


BTW: `isSSA()` in MIRParser will always return `true` for MIRs that does NOT have virtual regs, 
I think this is a limitation for now, we might want to extend it to support MIR with all HWregs,
but for now, we should check the code manually and carefully.  Thanks for pointing out.


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