[LLVMbugs] [Bug 2339] New: Instcoombine infinitely cycles

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2339

           Summary: Instcoombine infinitely cycles
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1648)
 --> (http://llvm.org/bugs/attachment.cgi?id=1648)
Bytecode in question

Consider attached testcase.

Typical output from opt -instcombine -debug is:

IC: Old =       mul i32 %tmp162163, ptrtoint (i32* getelementptr (i32* null,
i32 1) to i32)             ; <i32>:4 [#uses=1]
    New =       add i32 %tmp164, mul (i32 ptrtoint (i32* getelementptr (i32*
null, i32 1) to i32), i32 2)               ; <i32>:<badref> [#uses=0]
IC: Old =       add i32 %tmp164, mul (i32 ptrtoint (i32* getelementptr (i32*
null, i32 1) to i32), i32 2)               ; <i32>:4 [#uses=1]
    New =       mul i32 ptrtoint (i32* getelementptr (i32* null, i32 1) to
i32), %tmp164165             ; <i32>:<badref> [#uses=0]


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