[LLVMdev] dump cfg after each pass

[Duncan Sands]

Hi David,

> A dumb question -- is there a way to dump cfg after each pass, something like:
> --print-cfg-after=sccp, or is there a standard post-processing script that
> builds the cfg vcg/dot file from the ir dump?

if your IR is dumped to ir.ll, you can do this to see the cfg:
   opt -disable-output -view-cfg ir.ll
You may want to use -view-cfg-only rather than -view-cfg if you are
not interested in the instructions, only the cfg.  You could probably
also do something like the following to output the cfg after each pass:
   opt -pass1 -view-cfg -pass2 -view-cfg ... -passN -view-cfg file.ll

Ciao,

Duncan.