1; RUN: opt -S < %s -gvn | FileCheck %s
2
3declare void @llvm.sideeffect()
4
5; Store-to-load forwarding across a @llvm.sideeffect.
6
7; CHECK-LABEL: s2l
8; CHECK-NOT: load
9define float @s2l(float* %p) {
10    store float 0.0, float* %p
11    call void @llvm.sideeffect()
12    %t = load float, float* %p
13    ret float %t
14}
15
16; Redundant load elimination across a @llvm.sideeffect.
17
18; CHECK-LABEL: rle
19; CHECK: load
20; CHECK-NOT: load
21define float @rle(float* %p) {
22    %r = load float, float* %p
23    call void @llvm.sideeffect()
24    %s = load float, float* %p
25    %t = fadd float %r, %s
26    ret float %t
27}
28
29; LICM across a @llvm.sideeffect.
30
31; CHECK-LABEL: licm
32; CHECK: load
33; CHECK: loop:
34; CHECK-NOT: load
35define float @licm(i64 %n, float* nocapture readonly %p) #0 {
36bb0:
37  br label %loop
38
39loop:
40  %i = phi i64 [ 0, %bb0 ], [ %t5, %loop ]
41  %sum = phi float [ 0.000000e+00, %bb0 ], [ %t4, %loop ]
42  call void @llvm.sideeffect()
43  %t3 = load float, float* %p
44  %t4 = fadd float %sum, %t3
45  %t5 = add i64 %i, 1
46  %t6 = icmp ult i64 %t5, %n
47  br i1 %t6, label %loop, label %bb2
48
49bb2:
50  ret float %t4
51}
52