[LLVMdev] Understanding SelectionDAG construction

[ankur deshwal]

I am trying to understand the SelectionDAG construction from LLVM IR. I have
gone through the doc "The LLVM Target-Independent Code Generator" on LLVM
site. This gives a great initial overview. However I am unable to catch the
actual control flow for the llvm->selectionDag conversion.

The flags "-view-sched-dags".. described in the doc doesn't seem to work. (
"llc -help" doesn't list it ).

To understand the codeflow, I was trying to use gdb over llc. Where should I
put the breakpoints where I can see llvm->selectionDag conversion happening
e.g.  SDNode being generated out of llvm instructions.

Any pointer to detailed level doc will also help. Doxygen doesnt help till I
am a bit familiar with Codeflow.

Thanks.
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