1; There are two main cases where comdats are necessary:
2; 1. standard inline functions (weak_odr / linkonce_odr)
3; 2. available externally functions (C99 inline / extern template / dllimport)
4; Check that we do the right thing for the two object formats with comdats, ELF
5; and COFF.
6;
7; Test comdat functions. Non-comdat functions are tested in linkage.ll.
8; RUN: split-file %s %t
9; RUN: cat %t/main.ll %t/disable.ll > %t0.ll
10; RUN: cat %t/main.ll %t/enable.ll > %t1.ll
11; RUN: opt < %t0.ll -mtriple=x86_64-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
12; RUN: opt < %t1.ll -mtriple=x86_64-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
13; RUN: opt < %t0.ll -mtriple=x86_64-windows -passes=instrprof -S | FileCheck %s --check-prefixes=COFF
14; RUN: opt < %t1.ll -mtriple=x86_64-windows -passes=instrprof -S | FileCheck %s --check-prefixes=COFF
15
16;--- main.ll
17declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
18
19$foo_inline = comdat any
20$foo_extern = comdat any
21
22@__profn_foo_inline = linkonce_odr hidden constant [10 x i8] c"foo_inline"
23@__profn_foo_extern = linkonce_odr hidden constant [10 x i8] c"foo_extern"
24
25; ELF:   @__profc_foo_inline = linkonce_odr hidden global {{.*}}, section "__llvm_prf_cnts", comdat($__profd_foo_inline), align 8
26; ELF:   @__profd_foo_inline = linkonce_odr hidden global {{.*}}, section "__llvm_prf_data", comdat, align 8
27; COFF:  @__profc_foo_inline = linkonce_odr hidden global {{.*}}, section ".lprfc$M", comdat, align 8
28; COFF:  @__profd_foo_inline = linkonce_odr hidden global {{.*}}, section ".lprfd$M", comdat, align 8
29define weak_odr void @foo_inline() comdat {
30  call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_inline, i32 0, i32 0), i64 0, i32 1, i32 0)
31  ret void
32}
33
34; ELF:   @__profc_foo_extern = linkonce_odr hidden global{{.*}}, section "__llvm_prf_cnts", comdat($__profd_foo_extern), align 8
35; ELF:   @__profd_foo_extern = linkonce_odr hidden global{{.*}}, section "__llvm_prf_data", comdat, align 8
36; COFF:  @__profc_foo_extern = linkonce_odr hidden global{{.*}}, section ".lprfc$M", comdat, align 8
37; COFF:  @__profd_foo_extern = linkonce_odr hidden global{{.*}}, section ".lprfd$M", comdat, align 8
38define available_externally void @foo_extern() {
39  call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_extern, i32 0, i32 0), i64 0, i32 1, i32 0)
40  ret void
41}
42
43; ELF:   @llvm.compiler.used = appending global {{.*}} @__profd_foo_inline {{.*}} @__profd_foo_extern
44; COFF:  @llvm.used = appending global {{.*}} @__llvm_profile_runtime_user {{.*}} @__profd_foo_inline {{.*}} @__profd_foo_extern
45
46;--- disable.ll
47!llvm.module.flags = !{!0}
48!0 = !{i32 2, !"EnableValueProfiling", i32 0}
49
50;--- enable.ll
51!llvm.module.flags = !{!0}
52!0 = !{i32 2, !"EnableValueProfiling", i32 1}
53