[LLVMbugs] [Bug 7840] New: Loops are not unrolled

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Aug 7 11:04:54 PDT 2010


           Summary: Loops are not unrolled
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=5345)
 --> (http://llvm.org/bugs/attachment.cgi?id=5345)
Test C source

Consider the attached ะก / .ll source. opt -O3 does not unroll the loops there.
For me it seems like a pass ordering issue - additional early run of GVN fixes
the problem. Should we consider adding second GVN pass?

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