1; RUN: opt < %s -instcombine -globals-aa -licm -enable-new-pm=0 -S | FileCheck %s
2; RUN: opt < %s -aa-pipeline=basic-aa,globals-aa -passes='function(instcombine),require<globals-aa>,function(invalidate<aa>,loop(licm))' -S | FileCheck %s
3
4; Make sure -globals-aa ignores dead uses of globals.
5
6@a = internal global i32 0, align 4
7@c = common global i32 0, align 4
8
9; Function Attrs: nounwind
10define i32 @g() {
11; Make sure the load of @a is hoisted.
12; CHECK-LABEL: define i32 @g()
13; CHECK: entry:
14; CHECK-NEXT: load i32, i32* @a, align 4
15; CHECK-NEXT: br label %for.cond
16entry:
17  br label %for.cond
18
19for.cond:                                         ; preds = %for.inc, %entry
20  %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
21  %sum.0 = phi i32 [ 0, %entry ], [ %add, %for.inc ]
22  %cmp = icmp slt i32 %i.0, 1000
23  br i1 %cmp, label %for.body, label %for.end
24
25for.body:                                         ; preds = %for.cond
26  %0 = load i32, i32* @a, align 4
27  %add = add nsw i32 %sum.0, %0
28  call void @f()
29  br label %for.inc
30
31for.inc:                                          ; preds = %for.body
32  %inc = add nsw i32 %i.0, 1
33  br label %for.cond
34
35for.end:                                          ; preds = %for.cond
36  ret i32 %sum.0
37}
38
39; Function Attrs: nounwind
40define internal void @f() {
41entry:
42  %tobool = icmp ne i32 0, 0
43  br i1 %tobool, label %if.then, label %if.end
44
45if.then:                                          ; preds = %entry
46  store i32 ptrtoint (i32* @a to i32), i32* @c, align 4
47  br label %if.end
48
49if.end:                                           ; preds = %if.then, %entry
50  %0 = load i32, i32* @c, align 4
51  %inc = add nsw i32 %0, 1
52  store i32 %inc, i32* @c, align 4
53  ret void
54}
55
56