[LLVMbugs] [Bug 22304] New: CodeGen crash with "Queue is empty!" on lshr i256 instruction

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22304

            Bug ID: 22304
           Summary: CodeGen crash with "Queue is empty!" on lshr i256
                    instruction
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: chfast at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13724
  --> http://llvm.org/bugs/attachment.cgi?id=13724&action=edit
CodeGen test

Assertion failed: !Queue.empty() && "Queue is empty!", file
llvm\lib\CodeGen\SelectionDAG\ScheduleDAGRRList.cpp, line 1701
Stack dump:
0.      Program arguments:
h:\Sources\libs\build\llvm-3.5.0-x64\Debug\bin\llc.exe
bugpoint-reduced-simplified.ll
1.      Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.ll'.
2.      Running pass 'X86 DAG->DAG Instruction Selection' on function
'@lshr_codegen_bug_queue_is_empty'

It happens on Windows and Linux, LLVM 3.5.0. I will check current trunk.

I used bugpoint to reduce the test. I'm pretty sure the point of failure is
lshr i256 instruction because I reimplemented my algorithm without it and it
worked.

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