[LLVMbugs] [Bug 15950] New: A bug in DAG Combiner when turns a shuffle with undef mask of two CONCAT_VECTORS into a single concat

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15950

            Bug ID: 15950
           Summary: A bug in DAG Combiner when turns a shuffle with undef
                    mask of two CONCAT_VECTORS into a single concat
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hao.liu8822 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10488
  --> http://llvm.org/bugs/attachment.cgi?id=10488&action=edit
bug.ll Overflow caused by undef mask

In DAG Combiner, an undef mask in ShuffleVector causes an overflow of an
unsigned variable. The overflowed variable will cause the assertion failure.
To reproduce the failure: llc bug.ll

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