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a3296c73e9
This would hit the "Biggest class wasn't first" assert in getMatchingSubClassWithSubRegs in a future patch for EXTRACT_SUBREG handling. Mips defines 4 identical register classes (MSA128B, MSA128H, MSA128BW, MSA128D). These have the same set of registers, and only differ by the isel type. I believe this is an ill formed way of defining registers, that probably is just to work around the inconvenience of mixing different types in a single register class in DAG patterns. Since these all have the same size, they would all sort to the beginning, but you would not necessarily get the same super register at the front as the assert enforces. Breaking the ambiguity by also sorting by name doesn't work, since each of these register classes all want to be first. Force sorting of the original register class if the size is the same. |
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