[LLVMbugs] [Bug 3409] New: gvnpre: segmentation fault

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3409

           Summary: gvnpre: segmentation fault
           Product: libraries
           Version: trunk
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Global Analyses
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sliedes at cc.hut.fi
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=2446)
 --> (http://llvm.org/bugs/attachment.cgi?id=2446)
test case

Running "opt bugpoint-reduced-simplified.bc -gvnpre" on the attached bitcode
file causes a segmentation fault.

Here's the bitcode disassembled:

------------------------------------------------------------
; ModuleID = 'bugpoint-reduced-simplified.bc'
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-unknown-linux-gnu"

define i32 @base2flt1(i32 %e) nounwind readnone {
entry:
        br i1 false, label %entry.bb12_crit_edge, label %bb1

entry.bb12_crit_edge:           ; preds = %entry
        unreachable

bb1:            ; preds = %entry
        br i1 false, label %bb1.bb10_crit_edge, label %bb1.bb2_crit_edge

bb1.bb2_crit_edge:              ; preds = %bb1
        br label %bb2

bb1.bb10_crit_edge:             ; preds = %bb1
        unreachable

bb2:            ; preds = %bb4.bb2_crit_edge, %bb1.bb2_crit_edge
        br i1 false, label %bb4, label %bb2.bb12_crit_edge

bb2.bb12_crit_edge:             ; preds = %bb2
        br label %bb12

bb4:            ; preds = %bb2
        br i1 false, label %bb4.bb11_crit_edge, label %bb4.bb2_crit_edge

bb4.bb2_crit_edge:              ; preds = %bb4
        br label %bb2

bb4.bb11_crit_edge:             ; preds = %bb4
        br label %bb11

bb7:            ; preds = %bb10
        br i1 false, label %bb7.bb12_crit_edge, label %bb9

bb7.bb12_crit_edge:             ; preds = %bb7
        br label %bb12

bb9:            ; preds = %bb7
        %0 = lshr i32 %0, 1             ; <i32> [#uses=2]
        br label %bb10

bb10:           ; preds = %bb9
        br i1 false, label %bb7, label %bb10.bb11_crit_edge

bb10.bb11_crit_edge:            ; preds = %bb10
        br label %bb11

bb11:           ; preds = %bb10.bb11_crit_edge, %bb4.bb11_crit_edge
        %m_addr.1 = phi i32 [ 0, %bb4.bb11_crit_edge ], [ %0,
%bb10.bb11_crit_edge ]            ; <i32> [#uses=1]
        %1 = and i32 %m_addr.1, -16777217               ; <i32> [#uses=0]
        br label %UnifiedReturnBlock

bb12:           ; preds = %bb7.bb12_crit_edge, %bb2.bb12_crit_edge
        br label %UnifiedReturnBlock

UnifiedReturnBlock:             ; preds = %bb12, %bb11
        ret i32 0
}
------------------------------------------------------------


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