[llvm-dev] Register allocation error: "Remaining virtual register operands"
Alex Susu via llvm-dev
llvm-dev at lists.llvm.org
Fri Mar 10 03:01:49 PST 2017
Hello.
I'm developing a back end for a research SIMD processor.
I get the following error:
<<Remaining virtual register operands
UNREACHABLE executed at /llvm/lib/CodeGen/MachineRegisterInfo.cpp:144!>>
(when running with llc -O0, at end? of pass: "FAST REGISTER ALLOCATION")
Note that I used the suggestion from
http://lists.llvm.org/pipermail/llvm-dev/2014-October/077632.html to "override
requiresRegisterScavenging() and requiresFrameIndexScavenging() in your XXXRegisterInfo
class to return true". However, this did not help.
A few more details: I create in a pass immediately after the first instruction
scheduling phase a physical register (R31, a vector register), which I also reserve in
[Target]RegisterInfo::getReservedRegs().
I also use instruction bundles.
Could somebody please help me with this problem?
Thank you very much,
Alex
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