[LLVMbugs] [Bug 18068] New: DSE miscompile

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18068

            Bug ID: 18068
           Summary: DSE miscompile
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: hfinkel at anl.gov
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11614
  --> http://llvm.org/bugs/attachment.cgi?id=11614&action=edit
bugpoint reduced test case

ClangBugs2/diff/t43047 from PR16431 is a DSE miscompile.

To reproduce:

opt -o o.bc -basicaa -dse bugpoint-tooptimize.bc
clang o.bc bugpoint-tonotoptimize.bc -o t

./t < input.txt 
res = 1910

whereas running:

clang bugpoint-tooptimize.bc bugpoint-tonotoptimize.bc -o t
./t < input.txt 
res = 2553

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