1; RUN: opt -passes=openmp-opt -debug-only=openmp-opt -disable-output < %s 2>&1 | FileCheck %s
2; RUN: opt -passes=openmp-opt -pass-remarks-analysis=openmp-opt -disable-output < %s 2>&1 | FileCheck %s --check-prefix=REMARKS
3; REQUIRES: asserts
4; ModuleID = 'single_threaded_exeuction.c'
5
6define weak void @kernel() {
7  call void @__kmpc_kernel_init(i32 512, i16 1)
8  call void @nvptx()
9  call void @amdgcn()
10  ret void
11}
12
13; REMARKS: remark: single_threaded_execution.c:1:0: Could not internalize function. Some optimizations may not be possible.
14; REMARKS-NOT: remark: single_threaded_execution.c:1:0: Could not internalize function. Some optimizations may not be possible.
15
16; CHECK-NOT: [openmp-opt] Basic block @nvptx entry is executed by a single thread.
17; CHECK: [openmp-opt] Basic block @nvptx if.then is executed by a single thread.
18; CHECK-NOT: [openmp-opt] Basic block @nvptx if.end is executed by a single thread.
19; Function Attrs: noinline
20define internal void @nvptx() {
21entry:
22  %call = call i32 @llvm.nvvm.read.ptx.sreg.tid.x()
23  %cmp = icmp eq i32 %call, 0
24  br i1 %cmp, label %if.then, label %if.end
25
26if.then:
27  call void @foo()
28  call void @bar()
29  call void @baz()
30  call void @cold()
31  br label %if.end
32
33if.end:
34  ret void
35}
36
37; CHECK-NOT: [openmp-opt] Basic block @amdgcn entry is executed by a single thread.
38; CHECK: [openmp-opt] Basic block @amdgcn if.then is executed by a single thread.
39; CHECK-NOT: [openmp-opt] Basic block @amdgcn if.end is executed by a single thread.
40; Function Attrs: noinline
41define internal void @amdgcn() {
42entry:
43  %call = call i32 @llvm.amdgcn.workitem.id.x()
44  %cmp = icmp eq i32 %call, 0
45  br i1 %cmp, label %if.then, label %if.end
46
47if.then:
48  call void @foo()
49  call void @bar()
50  call void @baz()
51  call void @cold()
52  br label %if.end
53
54if.end:
55  ret void
56}
57
58; CHECK: [openmp-opt] Basic block @foo entry is executed by a single thread.
59; Function Attrs: noinline
60define internal void @foo() {
61entry:
62  ret void
63}
64
65; CHECK: [openmp-opt] Basic block @bar.internalized entry is executed by a single thread.
66; Function Attrs: noinline
67define void @bar() {
68entry:
69  ret void
70}
71
72; CHECK-NOT: [openmp-opt] Basic block @baz entry is executed by a single thread.
73; Function Attrs: noinline
74define weak void @baz() !dbg !8 {
75entry:
76  ret void
77}
78
79; CHECK-NOT: [openmp-opt] Basic block @cold entry is executed by a single thread.
80; Function Attrs: cold convergent noinline nounwind optnone mustprogress
81define weak void @cold() #0 !dbg !9 {
82entry:
83  ret void
84}
85
86declare i32 @llvm.nvvm.read.ptx.sreg.tid.x()
87
88declare i32 @llvm.amdgcn.workitem.id.x()
89
90declare void @__kmpc_kernel_init(i32, i16)
91
92attributes #0 = { cold noinline }
93
94!llvm.dbg.cu = !{!0}
95!llvm.module.flags = !{!3, !4, !5, !6}
96!nvvm.annotations = !{!7}
97
98!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
99!1 = !DIFile(filename: "single_threaded_execution.c", directory: "/tmp/single_threaded_execution.c")
100!2 = !{}
101!3 = !{i32 2, !"Debug Info Version", i32 3}
102!4 = !{i32 1, !"wchar_size", i32 4}
103!5 = !{i32 7, !"openmp", i32 50}
104!6 = !{i32 7, !"openmp-device", i32 50}
105!7 = !{void ()* @kernel, !"kernel", i32 1}
106!8 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 8, type: !10, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
107!9 = distinct !DISubprogram(name: "cold", scope: !1, file: !1, line: 8, type: !10, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
108!10 = !DISubroutineType(types: !2)
109