[llvm-bugs] [Bug 33396] New: Assertion `CB != OutsideLoopPreds[i] && "Loop has multiple entry points!"' failed (Csmith)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33396

            Bug ID: 33396
           Summary: Assertion `CB != OutsideLoopPreds[i] && "Loop has
                    multiple entry points!"' failed  (Csmith)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18609
  --> https://bugs.llvm.org/attachment.cgi?id=18609&action=edit
reduced testcase

; Function Attrs: nounwind
define void @main() local_unnamed_addr #0 {
entry:
  br label %lbl_1476.i.i

lbl_1476.i.i:                                     ; preds =
%safe_div_func_int8_t_s_s.exit.i.i, %entry
  br i1 icmp ne (i8* getelementptr inbounds ([2 x i8], [2 x i8]* @g_140, i64 0,
i64 1), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @g_13, i64 0, i64 1)),
label %cond.true.i.i.i, label %safe_div_func_int8_t_s_s.exit.i.i

cond.true.i.i.i:                                  ; preds = %lbl_1476.i.i
  br label %safe_div_func_int8_t_s_s.exit.i.i

safe_div_func_int8_t_s_s.exit.i.i:                ; preds = %cond.true.i.i.i,
%lbl_1476.i.i
  %cond.i2.i.i = phi i32 [ 60, %cond.true.i.i.i ], [ sdiv (i32 60, i32 zext (i1
icmp eq (i8* getelementptr inbounds ([2 x i8], [2 x i8]* @g_140, i64 0, i64 1),
i8* getelementptr inbounds ([2 x i8], [2 x i8]* @g_13, i64 0, i64 1)) to i32)),
%lbl_1476.i.i ]
  %cmp264.i.i = icmp slt i8 undef, -4
  br label %lbl_1476.i.i
}

bin/llc -mtriple=s390x-linux-gnu -mcpu=z13 -o out.s
./loop_entrypoints.reduced.ll -verify-loop-info

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