b9f1de04f6
Previously we had one loop over the DAG for immediates and registers and
another loop over the destination operands for mapping from the source.
Now we have a single loop over the destination operands that handles immediates,
registers, and named operands. A helper method is added so we can handle
operands and sub-operands specified by a sub-dag.
My goal is to allow a named operand to appear in a sub-dag which wasn't
supported before. This will allow the destination instruction to have an
operand with sub-operands when the source does not have sub operands.
For RISC-V, I'm looking into using an operand with sub-operands to
represent an reg+offset memory address. I need to be able to lower a
pseudo instruction that only has a register operand to an instruction
that has a reg+offset operand. The offset will be filled in with 0
during expansion and the register will be copied from the source.
The expansion would look like this:
def PseudoCALLIndirect : Pseudo<(outs), (ins GPRJALR:$rs1),
[(riscv_call GPRJALR:$rs1)]>,
PseudoInstExpansion<(JALR X1, (ops GPR:$rs1, 0))>;
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