1; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s
2; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
3
4; CHECK: Loop %bb: backedge-taken count is ((-5 + %x) /u 3)
5; CHECK: Loop %bb: max backedge-taken count is 1431655764
6
7
8; ScalarEvolution can't compute a trip count because it doesn't know if
9; dividing by the stride will have a remainder. This could theoretically
10; be teaching it how to use a more elaborate trip count computation.
11
12define i32 @f(i32 %x) nounwind readnone {
13entry:
14	%0 = icmp ugt i32 %x, 4		; <i1> [#uses=1]
15	br i1 %0, label %bb.nph, label %bb2
16
17bb.nph:		; preds = %entry
18	br label %bb
19
20bb:		; preds = %bb.nph, %bb1
21	%indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb1 ]		; <i32> [#uses=2]
22	%tmp = mul i32 %indvar, -3		; <i32> [#uses=1]
23	%x_addr.04 = add i32 %tmp, %x		; <i32> [#uses=1]
24	%1 = add i32 %x_addr.04, -3		; <i32> [#uses=2]
25	br label %bb1
26
27bb1:		; preds = %bb
28	%2 = icmp ugt i32 %1, 4		; <i1> [#uses=1]
29	%indvar.next = add i32 %indvar, 1		; <i32> [#uses=1]
30	br i1 %2, label %bb, label %bb1.bb2_crit_edge
31
32bb1.bb2_crit_edge:		; preds = %bb1
33	%.lcssa = phi i32 [ %1, %bb1 ]		; <i32> [#uses=1]
34	br label %bb2
35
36bb2:		; preds = %bb1.bb2_crit_edge, %entry
37	%x_addr.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ %x, %entry ]		; <i32> [#uses=1]
38	ret i32 %x_addr.0.lcssa
39}
40