xref: /llvm-project/llvm/test/tools/gold/X86/devirt_vcall_vis_public.ll (revision 5c458ed490a01dcc82f9d063732cac4207786fd5)
1;; Test that plugin option whole-program-visibility enables devirtualization.
2
3;; Index based WPD
4;; Generate unsplit module with summary for ThinLTO index-based WPD.
5; RUN: opt -thinlto-bc -o %t2.o %s
6; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
7; RUN:   --plugin-opt=whole-program-visibility \
8; RUN:   --plugin-opt=save-temps \
9; RUN:   --plugin-opt=-pass-remarks=. \
10; RUN:   %t2.o -o %t3 2>&1 | FileCheck %s --check-prefix=REMARK
11; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
12
13;; Hybrid WPD
14;; Generate split module with summary for hybrid Thin/Regular LTO WPD.
15; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o %t.o %s
16; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
17; RUN:   --plugin-opt=whole-program-visibility \
18; RUN:   --plugin-opt=save-temps \
19; RUN:   --plugin-opt=-pass-remarks=. \
20; RUN:   %t.o -o %t3 2>&1 | FileCheck %s --check-prefix=REMARK
21; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
22
23;; Regular LTO WPD
24; RUN: opt -o %t4.o %s
25; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
26; RUN:   --plugin-opt=whole-program-visibility \
27; RUN:   --plugin-opt=save-temps \
28; RUN:   --plugin-opt=-pass-remarks=. \
29; RUN:   %t4.o -o %t3 2>&1 | FileCheck %s --check-prefix=REMARK
30; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR
31
32; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi
33; REMARK-DAG: single-impl: devirtualized a call to _ZN1D1mEi
34
35;; Try everything again but without -whole-program-visibility to confirm
36;; WPD fails
37
38;; Index based WPD
39; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
40; RUN:   --plugin-opt=save-temps \
41; RUN:   --plugin-opt=-pass-remarks=. \
42; RUN:   %t2.o -o %t3 \
43; RUN:   2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty
44; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR
45
46;; Hybrid WPD
47; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
48; RUN:   --plugin-opt=save-temps \
49; RUN:   --plugin-opt=-pass-remarks=. \
50; RUN:   %t.o -o %t3 \
51; RUN:   2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty
52; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR
53
54;; Regular LTO WPD
55; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold%shlibext \
56; RUN:   --plugin-opt=save-temps \
57; RUN:   --plugin-opt=-pass-remarks=. \
58; RUN:   %t4.o -o %t3 \
59; RUN:   2>&1 | FileCheck /dev/null --implicit-check-not single-impl --allow-empty
60; RUN: llvm-dis %t3.0.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-NODEVIRT-IR
61
62target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
63target triple = "x86_64-grtev4-linux-gnu"
64
65%struct.A = type { ptr }
66%struct.B = type { %struct.A }
67%struct.C = type { %struct.A }
68%struct.D = type { ptr }
69
70@_ZTV1B = constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1B1fEi, ptr @_ZN1A1nEi] }, !type !0, !type !1, !vcall_visibility !5
71@_ZTV1C = constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1C1fEi, ptr @_ZN1A1nEi] }, !type !0, !type !2, !vcall_visibility !5
72@_ZTV1D = constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr undef, ptr @_ZN1D1mEi] }, !type !3, !vcall_visibility !5
73
74; Prevent the vtables from being dead code eliminated.
75@llvm.used = appending global [3 x ptr] [ ptr @_ZTV1B, ptr @_ZTV1C, ptr @_ZTV1D]
76
77; CHECK-IR-LABEL: define dso_local {{(noundef )?}}i32 @_start
78define i32 @_start(ptr %obj, ptr %obj2, i32 %a) {
79entry:
80  %vtable = load ptr, ptr %obj
81  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"_ZTS1A")
82  call void @llvm.assume(i1 %p)
83  %fptrptr = getelementptr ptr, ptr %vtable, i32 1
84  %fptr1 = load ptr, ptr %fptrptr, align 8
85
86  ;; Check that the call was devirtualized.
87  ; CHECK-IR: %call = tail call i32 @_ZN1A1nEi
88  ; CHECK-NODEVIRT-IR: %call = tail call i32 %fptr1
89  %call = tail call i32 %fptr1(ptr nonnull %obj, i32 %a)
90
91  %fptr22 = load ptr, ptr %vtable, align 8
92
93  ;; We still have to call it as virtual.
94  ; CHECK-IR: %call3 = tail call i32 %fptr22
95  ; CHECK-NODEVIRT-IR: %call3 = tail call i32 %fptr22
96  %call3 = tail call i32 %fptr22(ptr nonnull %obj, i32 %call)
97
98  %vtable2 = load ptr, ptr %obj2
99  %p2 = call i1 @llvm.type.test(ptr %vtable2, metadata !4)
100  call void @llvm.assume(i1 %p2)
101
102  %fptr33 = load ptr, ptr %vtable2, align 8
103
104  ;; Check that the call was devirtualized.
105  ; CHECK-IR: %call4 = tail call i32 @_ZN1D1mEi
106  ; CHECK-NODEVIRT-IR: %call4 = tail call i32 %fptr33
107  %call4 = tail call i32 %fptr33(ptr nonnull %obj2, i32 %call3)
108  ret i32 %call4
109}
110; CHECK-IR-LABEL: ret i32
111; CHECK-IR-LABEL: }
112
113declare i1 @llvm.type.test(ptr, metadata)
114declare void @llvm.assume(i1)
115
116define i32 @_ZN1B1fEi(ptr %this, i32 %a) #0 {
117   ret i32 0;
118}
119
120define i32 @_ZN1A1nEi(ptr %this, i32 %a) #0 {
121   ret i32 0;
122}
123
124define i32 @_ZN1C1fEi(ptr %this, i32 %a) #0 {
125   ret i32 0;
126}
127
128define i32 @_ZN1D1mEi(ptr %this, i32 %a) #0 {
129   ret i32 0;
130}
131
132;; Make sure we don't inline or otherwise optimize out the direct calls.
133attributes #0 = { noinline optnone }
134
135!0 = !{i64 16, !"_ZTS1A"}
136!1 = !{i64 16, !"_ZTS1B"}
137!2 = !{i64 16, !"_ZTS1C"}
138!3 = !{i64 16, !4}
139!4 = distinct !{}
140!5 = !{i64 0}
141