search for: selectiodagisel

...t1: i16 = Constant<127> In function: my_func On Sat, Nov 4, 2017 at 7:22 PM Craig Topper <craig.topper at gmail.com> wrote: > CopyToReg is not handle by patterns. It should be passed through isel > unchanged. It’s part of a special list of ISD opcodes that don’t change in > SelectioDAGISel::SelectCodeCommon > > It will then be turned into a TargetOpcode::COPY in > InstrEmitter::EmitSpecialNode when the DAG is turned into MachineInstrs. > > On Sat, Nov 4, 2017 at 7:02 PM Robert Baruch via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> So there...

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

...gt; >> On Sat, Nov 4, 2017 at 7:22 PM Craig Topper <craig.topper at gmail.com> >> wrote: >> >>> CopyToReg is not handle by patterns. It should be passed through isel >>> unchanged. It’s part of a special list of ISD opcodes that don’t change in >>> SelectioDAGISel::SelectCodeCommon >>> >>> It will then be turned into a TargetOpcode::COPY in >>> InstrEmitter::EmitSpecialNode when the DAG is turned into MachineInstrs. >>> >>> On Sat, Nov 4, 2017 at 7:02 PM Robert Baruch via llvm-dev < >>> llvm-dev at lis...