[llvm-dev] SD virt regs question

Lawrence, Peter via llvm-dev llvm-dev at lists.llvm.org
Tue Jun 28 12:40:15 PDT 2016

from the SD / SelectionDAG form of a global-virt-reg, IE a CopyToReg or CopyFromReg
where the Reg is a virtual-register (not a physical-register),
I need to compute the set of all other global-virt-regs that this one is connected
to through PHI nodes

as the PHI nodes set up equivalence relations,
I should be able to use ADT/EquivalenceClasses.h
which seems to implement a generic Union-Find algorithm,

I also note that there do not seem to be any uses of EquivalenceClasses
in CodeGen, so perhaps no one has had to do this before and I will
have to start from scratch ?

--Peter Lawrence.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160628/49d746f4/attachment.html>

More information about the llvm-dev mailing list