1 ; RUN: llc -march=bpf < %s | FileCheck %s
3 ; The IR is generated from a bpftrace script (https://github.com/iovisor/bpftrace/issues/1305)
4 ; and then slightly adapted for easy unit testing.
5 ; The llvm bugzilla link: https://bugs.llvm.org/show_bug.cgi?id=47591
7 %printf_t = type { i64, i64 }
9 define i64 @"kprobe:blk_update_request"(ptr %0) local_unnamed_addr section "s_kprobe:blk_update_request_1" {
11 %"struct kernfs_node.parent" = alloca i64, align 8
12 %printf_args = alloca %printf_t, align 8
13 %"struct cgroup.kn" = alloca i64, align 8
14 %"struct cgroup_subsys_state.cgroup" = alloca i64, align 8
15 %"struct blkcg_gq.blkcg" = alloca i64, align 8
16 %"struct bio.bi_blkg" = alloca i64, align 8
17 %"struct request.bio" = alloca i64, align 8
18 %1 = getelementptr i8, ptr %0, i64 112
19 %arg0 = load volatile i64, ptr %1, align 8
20 %2 = add i64 %arg0, 56
21 %3 = bitcast ptr %"struct request.bio" to ptr
22 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %3)
23 %probe_read = call i64 inttoptr (i64 4 to ptr)(ptr nonnull %"struct request.bio", i32 8, i64 %2)
24 %4 = load i64, ptr %"struct request.bio", align 8
25 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %3)
27 %6 = bitcast ptr %"struct bio.bi_blkg" to ptr
28 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %6)
29 %probe_read1 = call i64 inttoptr (i64 5 to ptr)(ptr nonnull %"struct bio.bi_blkg", i32 8, i64 %5)
30 %7 = load i64, ptr %"struct bio.bi_blkg", align 8
31 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %6)
33 %9 = bitcast ptr %"struct blkcg_gq.blkcg" to ptr
34 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %9)
35 %probe_read2 = call i64 inttoptr (i64 6 to ptr)(ptr nonnull %"struct blkcg_gq.blkcg", i32 8, i64 %8)
36 %10 = load i64, ptr %"struct blkcg_gq.blkcg", align 8
37 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %9)
38 %11 = bitcast ptr %"struct cgroup_subsys_state.cgroup" to ptr
39 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %11)
40 %probe_read3 = call i64 inttoptr (i64 7 to ptr)(ptr nonnull %"struct cgroup_subsys_state.cgroup", i32 8, i64 %10)
41 %12 = load i64, ptr %"struct cgroup_subsys_state.cgroup", align 8
42 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %11)
43 %13 = add i64 %12, 288
44 %14 = bitcast ptr %"struct cgroup.kn" to ptr
45 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %14)
46 %probe_read4 = call i64 inttoptr (i64 8 to ptr)(ptr nonnull %"struct cgroup.kn", i32 8, i64 %13)
47 %15 = load i64, ptr %"struct cgroup.kn", align 8
48 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %14)
49 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %printf_args)
51 %17 = bitcast ptr %"struct kernfs_node.parent" to ptr
52 store i64 0, ptr %printf_args, align 8
53 call void @llvm.lifetime.start.p0(i64 -1, ptr nonnull %17)
56 ; CHECK-NOT: r{{[0-9]+}} = 0
57 ; CHECK: [[REG3:r[0-9]+]] = *(u64 *)(r10 - 24)
58 ; CHECK: [[REG1:r[0-9]+]] = 0
59 ; CHECK: *(u64 *)(r10 - 24) = [[REG1]]
61 %probe_read5 = call i64 inttoptr (i64 9 to ptr)(ptr nonnull %"struct kernfs_node.parent", i32 8, i64 %16)
62 %18 = load i64, ptr %"struct kernfs_node.parent", align 8
63 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %17)
64 %19 = getelementptr inbounds %printf_t, ptr %printf_args, i64 0, i32 1
65 store i64 %18, ptr %19, align 8
66 %get_cpu_id = call i64 inttoptr (i64 18 to ptr)()
67 %perf_event_output = call i64 inttoptr (i64 10 to ptr)(ptr %0, i64 2, i64 %get_cpu_id, ptr nonnull %printf_args, i64 16)
68 call void @llvm.lifetime.end.p0(i64 -1, ptr nonnull %printf_args)
72 ; Function Attrs: argmemonly nounwind willreturn
73 declare void @llvm.lifetime.start.p0(i64 immarg %0, ptr nocapture %1) #1
75 ; Function Attrs: argmemonly nounwind willreturn
76 declare void @llvm.lifetime.end.p0(i64 immarg %0, ptr nocapture %1) #1
78 attributes #0 = { nounwind }
79 attributes #1 = { argmemonly nounwind willreturn }