[LLVMdev] Building a data flow graph from instructions in BasicBlock
kparzysz at codeaurora.org
Sun Nov 4 08:18:10 PST 2012
On 11/4/2012 12:19 AM, janarbek wrote:
> I will look at it. Is there any class that I should look at it ? What
> about Dataflow.h ?
> Since I am kind of new, I want to know which classes can help me quicker.
There is a class ScheduleDAGInstrs, which contains function
"buildSchedGraph". This is the one that will build a graph of SUnits
(i.e. scheduling units), which correspond to machine instructions (at
least in practice).
The way I've used it in the past for non-scheduling purposes was to
create a fake scheduler, which didn't do any scheduling, but still built
the dependency graph. I only used it in an experimental code and my
code was quick-and-dirty, so there may be better ways of getting it.
Check the schedulers, for example MachineScheduler.cpp, for how
ScheduleDAGInstrs is created and how it's used. ScheduleDAGMI is a
subclass of ScheduleDAGInstrs and the member function "schedule" builds
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