search for: getregistersforvalu

..." constraint (i.e. TargetLowering::C_RegisterClass) isn't handled and the function returns <pair>(0, NULL). However, it is explicitly called for that constraint by llvm::SelectionDAGLowering::visitInlineAsm(): if (OpInfo.ConstraintType == TargetLowering::C_RegisterClass) GetRegistersForValue(OpInfo, SawEarlyClobber, OutputRegs, InputRegs); Assuming the correct fix is to enhance llvm::TargetLowering::getRegForInlineAsmConstraint(), can someone give me some pointers as to how to fix it? I have no experience with the code and like to get my hands dirty... Thanks, BTW: Is there a...

...ectionDAGLowering::visitInlineAsm(): It's llvm::TargetLowering::getRegClassForInlineAsmConstraint() that returns an empty vector and thus is the root case of the assert. It seems that llvm::TargetLowering::getRegForInlineAsmConstraint() is supposed to work on a single (physical) register. In GetRegistersForValue() is the following: 3817 // This is a reference to a register class that doesn't directly correspond 3818 // to an LLVM register class. Allocate NumRegs consecutive, available, 3819 // registers from the class. 3820 RegClassRegs = TLI.getRegClassForInlineAsmConstraint(O...