File: 2008-05-25-NegativeStepToZero.ll

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llvm 2.6-9.1
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; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \
; RUN:   -scalar-evolution-max-iterations=0 | grep {backedge-taken count is 61}
; PR2364

define i32 @func_6() nounwind  {
entry:
	br label %bb5

bb:		; preds = %bb5
	%tmp2 = add i32 %i.0, 1		; <i32> [#uses=1]
	%tmp4 = add i8 %x.0, -4		; <i8> [#uses=1]
	br label %bb5

bb5:		; preds = %bb, %entry
	%x.0 = phi i8 [ 0, %entry ], [ %tmp4, %bb ]		; <i8> [#uses=2]
	%i.0 = phi i32 [ 0, %entry ], [ %tmp2, %bb ]		; <i32> [#uses=2]
	%tmp7 = icmp eq i8 %x.0, 12		; <i1> [#uses=1]
	br i1 %tmp7, label %return, label %bb

return:		; preds = %bb5
	ret i32 %i.0
}