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