1; RUN: opt -passes='default<O1>' -disable-verify --mtriple x86_64-pc-linux-gnu -disable-loop-unrolling=true \
2; RUN: -S -o - %s | FileCheck %s
3
4; This checks that the loop full unroller will fire in the new pass manager
5; when forced via #pragma in the source (or annotation in the code).
6target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
7target triple = "x86_64-unknown-linux-gnu"
8
9; We don't end up deleting the loop, merely turning it infinite, but we remove
10; everything inside of it so check for the loop structure and absence of
11; conditional branches.
12; CHECK-LABEL: bb
13; CHECK: br label
14; CHECK-NOT: br i1
15; CHECK: br label
16; CHECK-NOT: br i1
17
18; Function Attrs: noinline nounwind optnone uwtable
19define void @foo() #0 {
20bb:
21  %tmp = alloca [5 x i32*], align 16
22  %tmp1 = alloca i32, align 4
23  %tmp2 = alloca i32, align 4
24  store i32 5, i32* %tmp1, align 4
25  br label %bb3
26
27bb3:                                              ; preds = %bb23, %bb
28  %tmp4 = load i32, i32* %tmp1, align 4
29  %tmp5 = icmp ne i32 %tmp4, 0
30  br i1 %tmp5, label %bb6, label %bb24
31
32bb6:                                              ; preds = %bb3
33  store i32 0, i32* %tmp2, align 4
34  br label %bb7
35
36bb7:                                              ; preds = %bb20, %bb6
37  %tmp8 = load i32, i32* %tmp2, align 4
38  %tmp9 = icmp slt i32 %tmp8, 5
39  br i1 %tmp9, label %bb10, label %bb23
40
41bb10:                                             ; preds = %bb7
42  %tmp11 = load i32, i32* %tmp2, align 4
43  %tmp12 = sext i32 %tmp11 to i64
44  %tmp13 = getelementptr inbounds [5 x i32*], [5 x i32*]* %tmp, i64 0, i64 %tmp12
45  %tmp14 = load i32*, i32** %tmp13, align 8
46  %tmp15 = icmp ne i32* %tmp14, null
47  br i1 %tmp15, label %bb16, label %bb19
48
49bb16:                                             ; preds = %bb10
50  %tmp17 = load i32, i32* %tmp1, align 4
51  %tmp18 = add nsw i32 %tmp17, -1
52  store i32 %tmp18, i32* %tmp1, align 4
53  br label %bb19
54
55bb19:                                             ; preds = %bb16, %bb10
56  br label %bb20
57
58bb20:                                             ; preds = %bb19
59  %tmp21 = load i32, i32* %tmp2, align 4
60  %tmp22 = add nsw i32 %tmp21, 1
61  store i32 %tmp22, i32* %tmp2, align 4
62  br label %bb7, !llvm.loop !1
63
64bb23:                                             ; preds = %bb7
65  br label %bb3
66
67bb24:                                             ; preds = %bb3
68  ret void
69}
70
71attributes #0 = { noinline nounwind optnone uwtable }
72
73!llvm.module.flags = !{!0}
74
75!0 = !{i32 1, !"wchar_size", i32 4}
76!1 = distinct !{!1, !2}
77!2 = !{!"llvm.loop.unroll.full"}
78