http://llvm.org/bugs/show_bug.cgi?id=17876
Bug ID: 17876
Summary: TailDuplicate makes bad assumption about SSA form
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11508
--> http://llvm.org/bugs/attachment.cgi?id=11508&action=edit
Repro for TailDuplicate assert failure
During late machine code optimization with NVPTX, the following code in
TailDuplicate.cpp may be hit:
236├> MachineInstr *DefMI = MRI->getVRegDef(VReg);
MachineRegisterInfo::getVRegDef() assumes SSA form, but when running
TailDuplicate MRI->isSSA() is false.
For repro, the attached .ll file can be used with the nvptx target with the
following change to NVPTXTargetMachine.cpp:
1. Remove "disablePass(&TailDuplicateID);"
The TailDuplicate pass is currently disabled in NVPTX for a few reasons,
including this one.
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