llvm dev - May 2015 - [LLVMdev] Odd error with Return Instruction

Hi everyone,

I am working on a new backend and I am having an odd problem with the
CodeGenEmitter (trying to create GenCodeEmitter.inc) when defining the
 "return" instruction of this architecture. I have followed other
backends,
however, that did not solve it.

The "Return" instruction is defined as follows.

def Ret : SDNode<"ArchISD::RET", SDTNone,
                     [SDNPHasChain, SDNPOptInGlue, SDNPVariadic]>;

class ReturnInstr<string OpcStr, bits<8> OpVal, InstrItinClass Itin>
    : InstArch<(outs), (ins),
                OpcStr,
                [(Ret)], Itin>{
    let isReturn = 1;
}

def RET       : ReturnInstr<"return", 0b00100110, IIAlu>;


And the error is the following.

*Assertion failed: (i < OperandList.size() && "Invalid flat
operand #"),
function getSubOperandNumber, file
llvm/utils/TableGen/CodeGenInstruction.h, line 186.*


The odd thing is: this is similar to other architectures.

It looks like I cannot make an instruction to be *SDTNone (no Ins)*, since
it worked when I changed this instruction by adding an Input DAG in it
(that is not what I want, though).

Any thoughts? Am I missing something?


Thanks,
Tiago
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