1; RUN: opt -jump-threading -S < %s | FileCheck %s
2@global = external global i8*, align 8
3
4define i32 @foo(i32 %arg) {
5; CHECK-LABEL: @foo
6; CHECK-LABEL: bb:
7; CHECK: icmp eq
8; CHECK-NEXT: br i1 %tmp1, label %bb7, label %bb7
9bb:
10  %tmp = load i8*, i8** @global, align 8
11  %tmp1 = icmp eq i8* %tmp, null
12  br i1 %tmp1, label %bb3, label %bb2
13
14; CHECK-NOT: bb2:
15bb2:
16  br label %bb3
17
18; CHECK-NOT: bb3:
19bb3:
20  %tmp4 = phi i8 [ 1, %bb2 ], [ 0, %bb ]
21  %tmp5 = icmp eq i8 %tmp4, 0
22  br i1 %tmp5, label %bb7, label %bb6
23
24; CHECK-NOT: bb6:
25bb6:
26  br label %bb7
27
28; CHECK-LABEL: bb7:
29bb7:
30  %tmp8 = icmp eq i32 %arg, -1
31  br i1 %tmp8, label %bb9, label %bb10
32
33; CHECK-LABEL: bb9:
34bb9:
35  ret i32 0
36
37; CHECK-LABEL: bb10:
38bb10:
39  %tmp11 = icmp sgt i32 %arg, -1
40  call void @llvm.assume(i1 %tmp11)
41  ret i32 1
42}
43
44declare void @llvm.assume(i1)
45