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"(i8* %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, i8* %0, i64 112
19 %2 = bitcast i8* %1 to i64*
20 %arg0 = load volatile i64, i64* %2, align 8
21 %3 = add i64 %arg0, 56
22 %4 = bitcast i64* %"struct request.bio" to i8*
23 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %4)
24 %probe_read = call i64 inttoptr (i64 4 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct request.bio", i32 8, i64 %3)
25 %5 = load i64, i64* %"struct request.bio", align 8
26 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %4)
28 %7 = bitcast i64* %"struct bio.bi_blkg" to i8*
29 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %7)
30 %probe_read1 = call i64 inttoptr (i64 5 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct bio.bi_blkg", i32 8, i64 %6)
31 %8 = load i64, i64* %"struct bio.bi_blkg", align 8
32 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %7)
34 %10 = bitcast i64* %"struct blkcg_gq.blkcg" to i8*
35 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %10)
36 %probe_read2 = call i64 inttoptr (i64 6 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct blkcg_gq.blkcg", i32 8, i64 %9)
37 %11 = load i64, i64* %"struct blkcg_gq.blkcg", align 8
38 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %10)
39 %12 = bitcast i64* %"struct cgroup_subsys_state.cgroup" to i8*
40 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %12)
41 %probe_read3 = call i64 inttoptr (i64 7 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct cgroup_subsys_state.cgroup", i32 8, i64 %11)
42 %13 = load i64, i64* %"struct cgroup_subsys_state.cgroup", align 8
43 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %12)
44 %14 = add i64 %13, 288
45 %15 = bitcast i64* %"struct cgroup.kn" to i8*
46 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %15)
47 %probe_read4 = call i64 inttoptr (i64 8 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct cgroup.kn", i32 8, i64 %14)
48 %16 = load i64, i64* %"struct cgroup.kn", align 8
49 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %15)
50 %17 = bitcast %printf_t* %printf_args to i8*
51 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %17)
53 %19 = bitcast i64* %"struct kernfs_node.parent" to i8*
54 %20 = getelementptr inbounds %printf_t, %printf_t* %printf_args, i64 0, i32 0
55 store i64 0, i64* %20, align 8
56 call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %19)
59 ; CHECK-NOT: r{{[0-9]+}} = 0
60 ; CHECK: [[REG3:r[0-9]+]] = *(u64 *)(r10 - 24)
61 ; CHECK: [[REG1:r[0-9]+]] = 0
62 ; CHECK: *(u64 *)(r10 - 24) = [[REG1]]
64 %probe_read5 = call i64 inttoptr (i64 9 to i64 (i64*, i32, i64)*)(i64* nonnull %"struct kernfs_node.parent", i32 8, i64 %18)
65 %21 = load i64, i64* %"struct kernfs_node.parent", align 8
66 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %19)
67 %22 = getelementptr inbounds %printf_t, %printf_t* %printf_args, i64 0, i32 1
68 store i64 %21, i64* %22, align 8
69 %get_cpu_id = call i64 inttoptr (i64 18 to i64 ()*)()
70 %perf_event_output = call i64 inttoptr (i64 10 to i64 (i8*, i64, i64, %printf_t*, i64)*)(i8* %0, i64 2, i64 %get_cpu_id, %printf_t* nonnull %printf_args, i64 16)
71 call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %17)
75 ; Function Attrs: argmemonly nounwind willreturn
76 declare void @llvm.lifetime.start.p0i8(i64 immarg %0, i8* nocapture %1) #1
78 ; Function Attrs: argmemonly nounwind willreturn
79 declare void @llvm.lifetime.end.p0i8(i64 immarg %0, i8* nocapture %1) #1
81 attributes #0 = { nounwind }
82 attributes #1 = { argmemonly nounwind willreturn }