xref: /llvm-project/llvm/test/ThinLTO/X86/devirt_local_same_guid.ll (revision e4b27359fde552f65fd3434398a6b80104e1a20d) 
1; REQUIRES: x86-registered-target
2
3; Test that index-based devirtualization in the presence of same-named
4; local vtables in same named source files fails.
5
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_local_same_guid.ll
9
10; RUN: llvm-lto2 run %t3.o %t4.o -save-temps -pass-remarks=. \
11; RUN:   -wholeprogramdevirt-print-index-based \
12; RUN:   -o %t5 \
13; RUN:   -r=%t3.o,use_B,px \
14; RUN:   -r=%t3.o,test,px \
15; RUN:   -r=%t4.o,test2,px
16; RUN: llvm-dis %t5.1.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR1
17; RUN: llvm-dis %t5.2.4.opt.bc -o - | FileCheck %s --check-prefix=CHECK-IR2
18
19target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
20target triple = "x86_64-grtev4-linux-gnu"
21
22source_filename = "-"
23
24%struct.A = type { ptr }
25%struct.B = type { %struct.A }
26
27@_ZTV1B = internal constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr undef, ptr @_ZN1B1fEi, ptr @_ZN1B1nEi] }, !type !0, !type !1
28
29define internal i32 @_ZN1B1fEi(ptr %this, i32 %a) #0 {
30   ret i32 0;
31}
32
33define internal i32 @_ZN1B1nEi(ptr %this, i32 %a) #0 {
34   ret i32 0;
35}
36
37; Ensures that vtable of B is live so that we will attempt devirt.
38define dso_local i32 @use_B(ptr %a) {
39entry:
40  store ptr getelementptr inbounds ({ [4 x ptr] }, ptr @_ZTV1B, i64 0, i32 0, i64 2), ptr %a, align 8
41  ret i32 0
42}
43
44; CHECK-IR1: define i32 @test(
45define i32 @test(ptr %obj, i32 %a) {
46entry:
47  %vtable = load ptr, ptr %obj
48  %p = call i1 @llvm.type.test(ptr %vtable, metadata !"_ZTS1A")
49  call void @llvm.assume(i1 %p)
50  %fptrptr = getelementptr ptr, ptr %vtable, i32 1
51  %fptr1 = load ptr, ptr %fptrptr, align 8
52
53  ; Check that the call was not devirtualized.
54  ; CHECK-IR1: %call = tail call i32 %fptr1
55  %call = tail call i32 %fptr1(ptr nonnull %obj, i32 %a)
56
57  ret i32 %call
58}
59
60; CHECK-IR2: define i32 @test2
61; Check that the call was not devirtualized.
62; CHECK-IR2:   %call4 = tail call i32 %fptr
63
64declare i1 @llvm.type.test(ptr, metadata)
65declare void @llvm.assume(i1)
66
67attributes #0 = { noinline optnone }
68
69!0 = !{i64 16, !"_ZTS1A"}
70!1 = !{i64 16, !"_ZTS1B"}
71