[LLVMbugs] [Bug 4472] New: GVN pass really slow on this file

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4472

           Summary: GVN pass really slow on this file
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pawel.worach at gmail.com
                CC: llvmbugs at cs.uiuc.edu


When building emacs with clang the build of src/dbusbind.c seems to be taking
forever, this was tracked down to the GVN pass on the xd_append_arg function,
further bugpoint reduction causes strange crashers in opt.

0>pwo at one ~/bugpoint-emacs> time opt -gvn bugpoint-reduced-function.bc
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

364.180u 15.899s 6:21.51 99.6%  6730+3145k 0+0io 0pf+0w

Is this expected to be taking 6 minutes ?


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