[LLVMdev] Isel DAG documentation?

[Owen Anderson]

On Mar 7, 2014, at 4:28 PM, David Given <dg at cowlark.com> wrote:

> Can anyone point me at any decent resources as to what all this stuff
> actually does? And how to figure out what's going wrong when it
> inevitably does go wrong?
> 
> So far all I've found is include/llvm/Target/TargetSelectionDAG.td,
> which at least lists them but doesn't say what they do, and the C++
> implementations in SelectionDAGNodes.h, which is entirely undocumented...

Generally speaking, the Graphviz options (such as -view-isel-dags) to visualize DAGs are your friends. 
ISDOpcodes.h contains what documentation there is on the semantics of each opcode.

—Owen
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