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Add more thorough error checking for NULL register classes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46605 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -597,10 +597,11 @@ void ScheduleDAG::EmitSubregNode(SDNode *Node,
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// Grab the destination register
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const TargetRegisterClass *DRC = 0;
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DRC = RegInfo.getRegClass(VRBase);
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assert(SRC == DRC &&
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assert(SRC && DRC && SRC == DRC &&
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"Source subregister and destination must have the same class");
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} else {
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// Create the reg
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assert(SRC && "Couldn't find source register class");
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VRBase = RegInfo.createVirtualRegister(SRC);
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}
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