[LLVMbugs] [Bug 1311] NEW: llvm-ld missing a dce pass

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Thu Apr 5 04:20:07 PDT 2007


           Summary: llvm-ld missing a dce pass
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr

I ran "llvm-ld -O4" on some bytecode I had to hand, and noticed the
following in the result:

        %tmp3.i = load i8* getelementptr 
@system__restrictions__run_time_restrictions, i32 0, i32 2, i32 1)           ; 
<i8> [#uses=1]
        icmp eq i8 %tmp3.i, 0           ; <i1>:0 [#uses=0]

The second line is the only use of the first line, and the
second line has no uses!  "opt -dce" cleans this up, so presumably
llvm-ld could do with an extra dce pass.

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