1; RUN: opt < %s -dfsan -S | FileCheck %s
2target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
3target triple = "x86_64-unknown-linux-gnu"
4
5; CHECK: @__dfsan_shadow_width_bits = weak_odr constant i32 [[#SBITS:]]
6; CHECK: @__dfsan_shadow_width_bytes = weak_odr constant i32 [[#SBYTES:]]
7
8@a = common global i32 0
9@b = common global i32 0
10
11; Check that we reuse unions where possible.
12
13; CHECK-LABEL: @f.dfsan
14define void @f(i32 %x, i32 %y) {
15  ; CHECK: or i[[#SBITS]]
16  %xay = add i32 %x, %y
17  store i32 %xay, i32* @a
18  ; CHECK-NOT: or i[[#SBITS]]
19  %xmy = mul i32 %x, %y
20  store i32 %xmy, i32* @b
21  ret void
22}
23
24; In this case, we compute the unions on both sides because neither block
25; dominates the other.
26
27; CHECK-LABEL: @g.dfsan
28define void @g(i1 %p, i32 %x, i32 %y) {
29  br i1 %p, label %l1, label %l2
30
31l1:
32  ; CHECK: or i[[#SBITS]]
33  %xay = add i32 %x, %y
34  store i32 %xay, i32* @a
35  br label %l3
36
37l2:
38  ; CHECK: or i[[#SBITS]]
39  %xmy = mul i32 %x, %y
40  store i32 %xmy, i32* @b
41  br label %l3
42
43l3:
44  ret void
45}
46
47; In this case, we know that the label for %xayax subsumes the label for %xay.
48
49; CHECK-LABEL: @h.dfsan
50define i32 @h(i32 %x, i32 %y) {
51  ; CHECK: or i[[#SBITS]]
52  %xay = add i32 %x, %y
53  ; CHECK-NOT: or i[[#SBITS]]
54  %xayax = add i32 %xay, %x
55  ret i32 %xayax
56}
57