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

[Aditya Nandakumar via Phabricator via llvm-commits]

aditya_nandakumar added inline comments.


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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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After ISel, is it at all possible that vregs will have no regclass assigned? The above code assumes that specifically.


Repository:
  rL LLVM

https://reviews.llvm.org/D42697