[PATCH] D42697: [GlobalISel] Fix crash due to assuming a COPY src reg has a reg class

[Amara Emerson via Phabricator via llvm-commits]

aemerson added inline comments.


================
Comment at: lib/CodeGen/GlobalISel/InstructionSelect.cpp:186
+        auto DstRC = MRI.getRegClassOrNull(DstReg);
+        if (SrcReg && SrcRC == DstRC) {
           MRI.replaceRegWith(DstReg, SrcReg);
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aditya_nandakumar wrote:
> After ISel, is it at all possible that vregs will have no regclass assigned? The above code assumes that specifically.
I'm not sure, it did seem odd. Perhaps the underlying issue is manifesting before this.


Repository:
  rL LLVM

https://reviews.llvm.org/D42697