[LLVMbugs] [Bug 3090] New: Apparent miscompilation with -loop-index-split -loop-rotate -indvars -domtree

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon Nov 17 18:07:57 PST 2008


           Summary: Apparent miscompilation with -loop-index-split -loop-
                    rotate -indvars -domtree
           Product: libraries
           Version: 2.4
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Loop Optimizer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sliedes at cc.hut.fi
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=2221)
 --> (http://llvm.org/bugs/attachment.cgi?id=2221)
Test case

Not sure if this is related to #3089, however in this case the required bitcode
is smaller and the options slightly different.

I suspect the options "-loop-index-split -loop-rotate -indvars -domtree" to opt
miscompile the attached bitcode. The same caveats as in #3089 apply: I believe
the code is correct, but don't know for sure; it works with e.g. all the -O
levels in llvm, but the program segfaults with the given options.

Architecture is amd64.

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