[llvm-dev] What pattern string corresponds to CopyToReg?

Robert Baruch via llvm-dev llvm-dev at lists.llvm.org
Sat Nov 4 19:02:14 PDT 2017

So there's a DAG that looks like this in the debug output:

  Selecting: t3: ch,glue = CopyToReg t0, Register:i16 %R5, Constant:i16<127>

In the instruction selection phase, what pattern would that match? I've
constructed this so far:

  (??? REG16:$dst, i16imm:$src)

but the problem is, I can't determine what to use as ???. There is an
ISD::CopyToReg enum value, but I don't know how that translates to the
string to use in the pattern.

And more generally, how do I find out from a DAG diagram like the ones
output by -view-isel-dags which node type corresponds to which pattern


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