[llvm-dev] interpretation of dag output

[Rail Shafigulin via llvm-dev]

I'm trying to figure out how to interpret DAG output that is shown below.
If I were to draw it by hand, how would I do it? I tried to do it, but
unfortunately I can't figure it out. I know there is a way to generate a
graph, but I made some changes to my backend which hangs clang/llc.

Would someone be kind enough to give a picture of what of a graph below?
I'm sure once I see one I will be able to plot my own.

Any help is appreciated.

Here is the graph:

Type-legalized selection DAG: BB#3 'foo:middle.block26'
SelectionDAG has 19 nodes:
  0x26438b0: ch = EntryToken [ID=-3]

    0x26438b0: <multiple use>
    0x2672810: v4i32 = Register %vreg4 [ID=-3]

  0x2672a20: v4i32,ch = CopyFromReg 0x26438b0, 0x2672810 [ORD=5] [ID=-3]

  0x26761c8: v4i32 = undef [ID=-3]

    0x2672a20: <multiple use>
      0x2672a20: <multiple use>
      0x26761c8: <multiple use>
    0x2674b88: v4i32 = vector_shuffle 0x2672a20, 0x26761c8<2,3,u,u> [ORD=5]
[ID=-3]

  0x2671ec8: v4i32 = add 0x2672a20, 0x2674b88 [ORD=6] [ID=-3]

  0x2672600: i32 = Register %R11 [ID=-3]

          0x26438b0: <multiple use>
          0x26760c0: i32 = TargetFrameIndex<2> [ID=-3]

        0x2674fa8: ch = lifetime.end 0x26438b0, 0x26760c0 [ORD=10] [ID=-3]

        0x2675a90: i32 = TargetFrameIndex<1> [ID=-3]

      0x2674a80: ch = lifetime.end 0x2674fa8, 0x2675a90 [ORD=11] [ID=-3]

      0x26752c0: i32 = TargetFrameIndex<0> [ID=-3]

    0x2671fd0: ch = lifetime.end 0x2674a80, 0x26752c0 [ORD=12] [ID=-3]

    0x2672600: <multiple use>
        0x2671ec8: <multiple use>
          0x2671ec8: <multiple use>
          0x26761c8: <multiple use>
        0x2672c30: v4i32 = vector_shuffle 0x2671ec8, 0x26761c8<1,u,u,u>
[ORD=7] [ID=-3]

      0x2675da8: v4i32 = add 0x2671ec8, 0x2672c30 [ORD=8] [ID=-3]

      0x26721e0: i32 = Constant<0> [ID=-3]

    0x26757e8: i32 = extract_vector_elt 0x2675da8, 0x26721e0 [ORD=9] [ID=-3]

  0x26755d8: ch,glue = CopyToReg 0x2671fd0, 0x2672600, 0x26757e8 [ORD=13]
[ID=-3]

    0x26755d8: <multiple use>
    0x2672600: <multiple use>
    0x26755d8: <multiple use>
  0x26750b0: ch = EsenciaISD::RET_FLAG 0x26755d8, 0x2672600, 0x26755d8:1
[ORD=13] [ID=-3]


-- 
Rail Shafigulin
Software Engineer
Esencia Technologies
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