1; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
2
3; ScalarEvolution should be able to understand the loop and eliminate the casts.
4
5target datalayout = "e-p:32:32:32-p1:16:16:16-p2:8:8:8-p4:64:64:64-n16:32:64"
6
7; CHECK:  {%d,+,4}<%bb>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: ((4 * (trunc i32 (-1 + %n) to i16)) + %d)
8
9
10define void @foo(i32 addrspace(1)* nocapture %d, i32 %n) nounwind {
11; CHECK: @foo
12entry:
13	%0 = icmp sgt i32 %n, 0		; <i1> [#uses=1]
14	br i1 %0, label %bb.nph, label %return
15
16bb.nph:		; preds = %entry
17	br label %bb
18
19bb:		; preds = %bb1, %bb.nph
20	%i.02 = phi i32 [ %5, %bb1 ], [ 0, %bb.nph ]		; <i32> [#uses=2]
21	%p.01 = phi i8 [ %4, %bb1 ], [ -1, %bb.nph ]		; <i8> [#uses=2]
22	%1 = sext i8 %p.01 to i32		; <i32> [#uses=1]
23	%2 = sext i32 %i.02 to i64		; <i64> [#uses=1]
24	%3 = getelementptr i32, i32 addrspace(1)* %d, i64 %2		; <i32*> [#uses=1]
25	store i32 %1, i32 addrspace(1)* %3, align 4
26	%4 = add i8 %p.01, 1		; <i8> [#uses=1]
27	%5 = add i32 %i.02, 1		; <i32> [#uses=2]
28	br label %bb1
29
30bb1:		; preds = %bb
31	%6 = icmp slt i32 %5, %n		; <i1> [#uses=1]
32	br i1 %6, label %bb, label %bb1.return_crit_edge
33
34bb1.return_crit_edge:		; preds = %bb1
35	br label %return
36
37return:		; preds = %bb1.return_crit_edge, %entry
38	ret void
39}
40
41define void @test(i8 addrspace(1)* %a, i32 %n) nounwind {
42; CHECK: @test
43entry:
44  %cmp1 = icmp sgt i32 %n, 0
45  br i1 %cmp1, label %for.body.lr.ph, label %for.end
46
47for.body.lr.ph:                                   ; preds = %entry
48  %tmp = zext i32 %n to i64
49  br label %for.body
50
51for.body:                                         ; preds = %for.body, %for.body.lr.ph
52  %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %for.body.lr.ph ]
53  %arrayidx = getelementptr i8, i8 addrspace(1)* %a, i64 %indvar
54  store i8 0, i8 addrspace(1)* %arrayidx, align 1
55  %indvar.next = add i64 %indvar, 1
56  %exitcond = icmp ne i64 %indvar.next, %tmp
57  br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge
58
59for.cond.for.end_crit_edge:                       ; preds = %for.body
60  br label %for.end
61
62for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
63  ret void
64}
65
66; CHECK: Determining loop execution counts for: @test
67; CHECK-NEXT: backedge-taken count is
68; CHECK-NEXT: max backedge-taken count is -1
69