1 ; REQUIRES: x86-registered-target
3 ; Test that index-based devirtualization in the presence of external
4 ; vtables with the same name (with comdat) succeeds.
6 ; Generate unsplit module with summary for ThinLTO index-based WPD.
7 ; RUN: opt -thinlto-bc -o %t3.o %s
8 ; RUN: opt -thinlto-bc -o %t4.o %p/Inputs/devirt_external_comdat_same_guid.ll
10 ; RUN: llvm-lto2 run %t3.o %t4.o -save-temps -use-new-pm -pass-remarks=. \
11 ; RUN: -whole-program-visibility \
12 ; RUN: -wholeprogramdevirt-print-index-based \
14 ; RUN: -r=%t3.o,use_B,px \
15 ; RUN: -r=%t3.o,test,px \
16 ; RUN: -r=%t3.o,_ZTV1B,px \
17 ; RUN: -r=%t3.o,_ZN1B1fEi,px \
18 ; RUN: -r=%t3.o,_ZN1B1nEi,px \
19 ; RUN: -r=%t4.o,_ZTV1B,x \
20 ; RUN: -r=%t4.o,_ZN1B1fEi,x \
21 ; RUN: -r=%t4.o,_ZN1A1nEi,x \
22 ; RUN: -r=%t4.o,test2,px \
23 ; RUN: 2>&1 | FileCheck %s --check-prefix=REMARK --check-prefix=PRINT
24 ; RUN: llvm-dis %t5.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR1
25 ; RUN: llvm-dis %t5.2.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR2
27 ; PRINT-DAG: Devirtualized call to {{.*}} (_ZN1A1nEi)
29 ; REMARK-DAG: single-impl: devirtualized a call to _ZN1A1nEi
31 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
32 target triple = "x86_64-grtev4-linux-gnu"
36 %struct.A = type { i32 (...)** }
37 %struct.B = type { %struct.A }
41 @_ZTV1B = constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* undef, i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B1fEi to i8*), i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B1nEi to i8*)] }, comdat, !type !0, !type !1
43 define i32 @_ZN1B1fEi(%struct.B* %this, i32 %a) #0 comdat($_ZTV1B) {
47 define i32 @_ZN1B1nEi(%struct.B* %this, i32 %a) #0 comdat($_ZTV1B) {
51 ; Ensures that vtable of B is live so that we will attempt devirt.
52 define dso_local i32 @use_B(%struct.B* %a) {
54 %0 = bitcast %struct.B* %a to i32 (...)***
55 store i32 (...)** bitcast (i8** getelementptr inbounds ({ [4 x i8*] }, { [4 x i8*] }* @_ZTV1B, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %0, align 8
59 ; CHECK-IR1: define i32 @test(
60 define i32 @test(%struct.A* %obj, i32 %a) {
62 %0 = bitcast %struct.A* %obj to i8***
63 %vtable = load i8**, i8*** %0
64 %1 = bitcast i8** %vtable to i8*
65 %p = call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1A")
66 call void @llvm.assume(i1 %p)
67 %fptrptr = getelementptr i8*, i8** %vtable, i32 1
68 %2 = bitcast i8** %fptrptr to i32 (%struct.A*, i32)**
69 %fptr1 = load i32 (%struct.A*, i32)*, i32 (%struct.A*, i32)** %2, align 8
71 ; Check that the call was devirtualized.
72 ; CHECK-IR1: tail call i32 {{.*}}@_ZN1A1nEi
73 %call = tail call i32 %fptr1(%struct.A* nonnull %obj, i32 %a)
78 ; CHECK-IR2: define i32 @test2
79 ; Check that the call was devirtualized.
80 ; CHECK-IR2: tail call i32 @_ZN1A1nEi
82 declare i1 @llvm.type.test(i8*, metadata)
83 declare void @llvm.assume(i1)
85 attributes #0 = { noinline optnone }
87 !0 = !{i64 16, !"_ZTS1A"}
88 !1 = !{i64 16, !"_ZTS1B"}