[LLVMbugs] [Bug 15474] New: Loop vectorizer creates invalid IR.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Mar 8 08:10:50 PST 2013


            Bug ID: 15474
           Summary: Loop vectorizer creates invalid IR.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: benny.kra at gmail.com
                CC: llvmbugs at cs.uiuc.edu, nrotem at apple.com
    Classification: Unclassified

Created attachment 10156
  --> http://llvm.org/bugs/attachment.cgi?id=10156&action=edit
IR testcase

$ opt -S -loop-vectorize < t.ll
Instruction does not dominate all uses!
  %1 = insertelement <2 x double> zeroinitializer, double %tmp, i32 0
  %rdx.vec.exit.phi = phi <2 x double> [ %1, %bb3.preheader ], [ %1,
%vector.memcheck ], [ %22, %vector.body ]
Broken module found, compilation aborted!

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