[LLVMbugs] [Bug 16452] New: loop vectorizer: Instruction does not dominate all uses

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16452

            Bug ID: 16452
           Summary: loop vectorizer: Instruction does not dominate all
                    uses
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: hfinkel at anl.gov
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10766
  --> http://llvm.org/bugs/attachment.cgi?id=10766&action=edit
bugpoint reduced test case

As of r184853, running opt bugpoint-reduced-simplified.ll -loop-vectorize on
the attached input yields:

Instruction does not dominate all uses!
  %idxprom21 = zext i32 undef to i64
  %14 = getelementptr inbounds [100 x [100 x i32]]* undef, i64 0, i64
%idxprom21, i64 %13

bugpoint found this problem while I was attempting to reduce the t842 test case
from PR16431.

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