llvm dev - Dec 2020 - finding liveout phys registers

I need a routine that, post register allocation, finds for a basic block the 
registers that were modified and still live at the end of the block.  Is the 
something already implemented I can call?  Or some close I can copy and modify?

Thanks,
brian

Take a look at the LivePhysRegs class.  It can help with the live-outs (which is
really the union of live-ins from all successors).  As for finding the registers
that were modified---you'd need to traverse the block to collect that data. 
Still, LivePhysRegs does have functions that assist with that
(stepBackward/stepForward), so maybe that's all you need.

--
Krzysztof Parzyszek  kparzysz at quicinc.com   AI tools development

-----Original Message-----
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Bagel via
llvm-dev
Sent: Thursday, December 10, 2020 3:10 PM
To: llvm-dev at lists.llvm.org
Subject: [EXT] [llvm-dev] finding liveout phys registers

I need a routine that, post register allocation, finds for a basic block the
registers that were modified and still live at the end of the block.  Is the
something already implemented I can call?  Or some close I can copy and modify?

Thanks,
brian
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