1; Test for PR45393: Two virtual functions that return unique i1 values
2; in the same vtable. Both calls are optimized to a comparison of
3; this's vptr against the address of the vtable. When nesting these
4; checks, LLVM would previously assume the nested check always fails,
5; but that assumption does not hold if both checks refer to the same vtable.
6; This tests checks that this case is handled correctly.
7;
8; RUN: opt -S -wholeprogramdevirt -wholeprogramdevirt-summary-action=import \
9; RUN:   -wholeprogramdevirt-read-summary=%p/Inputs/unique-retval-same-vtable.yaml \
10; RUN:   -O2 -o - %s | FileCheck %s
11;
12; Check that C::f() contains both possible return values.
13; CHECK-LABEL: define {{.*}} @_ZNK1C1fEv
14; CHECK-NOT: }
15; CHECK: 20074028
16; CHECK-NOT: }
17; CHECK: 1008434
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-unknown-linux-gnu"
21
22%class.C = type { i32 (...)** }
23
24define hidden i32 @_ZNK1C1fEv(%class.C* %this) {
25entry:
26  %0 = bitcast %class.C* %this to i1 (%class.C*)***
27  %vtable = load i1 (%class.C*)**, i1 (%class.C*)*** %0
28  %1 = bitcast i1 (%class.C*)** %vtable to i8*
29  %2 = tail call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1C")
30  tail call void @llvm.assume(i1 %2)
31  %vfn = getelementptr inbounds i1 (%class.C*)*, i1 (%class.C*)** %vtable, i64 2
32  %3 = load i1 (%class.C*)*, i1 (%class.C*)** %vfn
33  %call = tail call zeroext i1 %3(%class.C* %this)
34  br i1 %call, label %if.then, label %return
35
36if.then:
37  %vtable2 = load i1 (%class.C*)**, i1 (%class.C*)*** %0
38  %4 = bitcast i1 (%class.C*)** %vtable2 to i8*
39  %5 = tail call i1 @llvm.type.test(i8* %4, metadata !"_ZTS1C")
40  tail call void @llvm.assume(i1 %5)
41  %vfn3 = getelementptr inbounds i1 (%class.C*)*, i1 (%class.C*)** %vtable2, i64 3
42  %6 = load i1 (%class.C*)*, i1 (%class.C*)** %vfn3
43  ; The method being called here and the method being called before
44  ; the branch above both return true in the same vtable and only that
45  ; vtable. Therefore, if this call is reached, we must select
46  ; 20074028. Earlier versions of LLVM mistakenly concluded that
47  ; this code *never* selects 200744028.
48  %call4 = tail call zeroext i1 %6(%class.C* nonnull %this)
49  %. = select i1 %call4, i32 20074028, i32 3007762
50  br label %return
51
52return:
53  %retval.0 = phi i32 [ %., %if.then ], [ 1008434, %entry ]
54  ret i32 %retval.0
55}
56
57declare i1 @llvm.type.test(i8*, metadata)
58
59declare void @llvm.assume(i1)
60