1; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
2; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
3
4%struct.small = type { i8 }
5
6@.str = private unnamed_addr constant [4 x i8] c"%s\0A\00", align 1
7
8; Address-of a structure taken in a function with a loop where
9; the alloca is an incoming value to a PHI node and a use of that PHI
10; node is also an incoming value.
11; Verify that the address-of analysis does not get stuck in infinite
12; recursion when chasing the alloca through the PHI nodes.
13; Requires protector.
14define i32 @foo(i32 %arg) nounwind uwtable safestack {
15bb:
16  ; CHECK: __safestack_unsafe_stack_ptr
17  %tmp = alloca %struct.small*, align 8
18  %tmp1 = call i32 (...) @dummy(%struct.small** %tmp) nounwind
19  %tmp2 = load %struct.small*, %struct.small** %tmp, align 8
20  %tmp3 = ptrtoint %struct.small* %tmp2 to i64
21  %tmp4 = trunc i64 %tmp3 to i32
22  %tmp5 = icmp sgt i32 %tmp4, 0
23  br i1 %tmp5, label %bb6, label %bb21
24
25bb6:                                              ; preds = %bb17, %bb
26  %tmp7 = phi %struct.small* [ %tmp19, %bb17 ], [ %tmp2, %bb ]
27  %tmp8 = phi i64 [ %tmp20, %bb17 ], [ 1, %bb ]
28  %tmp9 = phi i32 [ %tmp14, %bb17 ], [ %tmp1, %bb ]
29  %tmp10 = getelementptr inbounds %struct.small, %struct.small* %tmp7, i64 0, i32 0
30  %tmp11 = load i8, i8* %tmp10, align 1
31  %tmp12 = icmp eq i8 %tmp11, 1
32  %tmp13 = add nsw i32 %tmp9, 8
33  %tmp14 = select i1 %tmp12, i32 %tmp13, i32 %tmp9
34  %tmp15 = trunc i64 %tmp8 to i32
35  %tmp16 = icmp eq i32 %tmp15, %tmp4
36  br i1 %tmp16, label %bb21, label %bb17
37
38bb17:                                             ; preds = %bb6
39  %tmp18 = getelementptr inbounds %struct.small*, %struct.small** %tmp, i64 %tmp8
40  %tmp19 = load %struct.small*, %struct.small** %tmp18, align 8
41  %tmp20 = add i64 %tmp8, 1
42  br label %bb6
43
44bb21:                                             ; preds = %bb6, %bb
45  %tmp22 = phi i32 [ %tmp1, %bb ], [ %tmp14, %bb6 ]
46  %tmp23 = call i32 (...) @dummy(i32 %tmp22) nounwind
47  ret i32 undef
48}
49
50declare i32 @dummy(...)
51