[LLVMdev] Writing pass for llc

Shuguang Feng shuguang.feng at gmail.com
Wed Jul 15 13:46:56 PDT 2009

Thanks Devang.  A former office mate pointed me toward the
LLVMTargetMachine::addPreRegAlloc() function.  I appreciate your quick


On Jul 14, 2:06 pm, Devang Patel <devang.pa... at gmail.com> wrote:
> On Sun, Jul 12, 2009 at 2:09 PM, shu<shuguang.f... at gmail.com> wrote:
> > Is there a beginner's tutorial/documentation on how to write passes
> > for thellctool?  I've managed to write some simple analysis passes
> > for the opt tool but can't figure out how to do the same forllc.
> > What is the proper way to integrate a new MachineFunction pass with
> >llc?  Is there a way to register passes and selectively enable them on
> > the command line (as with opt) or do I need to hard code it into
> >llc.cpp?
> > I would like to be able to write a pass that looks at MachineFunctions
> > and inserts instructions right before register allocation (but after
> > all other optimization/instruction selection passes).  Any direction/
> > advice would be of great help.  Thanks!
> llcuses Target.addPassesToEmit* interface to add passes. You can
> insert your pass at appropriate place here.
> -
> Devang
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