http://llvm.org/bugs/show_bug.cgi?id=15787
Bug ID: 15787
Summary: Assert in llvm::MachineRegisterInfo::clearVirtRegs:
Vreg use list non-empty still
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10373
--> http://llvm.org/bugs/attachment.cgi?id=10373&action=edit
bugpoint reduced test case
I may have found a bug in the register allocator. To see the bug, first apply
the attached patch (which makes the PPC optimizeCompareInst function more
aggressive than it should be), and then run the attached test case using:
-mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 -- While applying the patch
will make optimizeCompareInst make a transformation that it can't guarantee is
legal, I don't think that the register allocator should care about that.
It currently asserts like this:
llc: llvm-trunk/lib/CodeGen/MachineRegisterInfo.cpp:111: void
llvm::MachineRegisterInfo::clearVirtRegs(): Assertion
`VRegInfo[TargetRegisterInfo::index2VirtReg(i)].second == 0 && "Vreg use list
non-empty still?"' failed.
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