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1 2; RUN: opt < %s -passes=globaldce -S | FileCheck %s3 4target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"5 6; struct A {7; A();8; virtual int foo(int);9; virtual int bar(float);10; };11; 12; struct B : A {13; B();14; virtual int foo(int);15; virtual int bar(float);16; };17; 18; A::A() {}19; B::B() {}20; int A::foo(int) { return 1; }21; int A::bar(float) { return 2; }22; int B::foo(int) { return 3; }23; int B::bar(float) { return 4; }24; 25; extern "C" int test(B *p, int (B::*q)(int)) { return (p->*q)(42); }26 27; Member function pointers are tracked by the combination of their object type28; and function type, which must both be compatible. Here, the call is through a29; pointer of type "int (B::*q)(int)", so the call could only be dispatched to30; B::foo. It can't be dispatched to A::bar or B::bar as the function pointer31; does not match, and it can't be dispatched to A::foo as the object type32; doesn't match, so those can be removed.33 34%struct.A = type { ptr }35%struct.B = type { %struct.A }36 37; CHECK: @_ZTV1A = internal unnamed_addr constant { [4 x ptr] } zeroinitializer38@_ZTV1A = internal unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr null, ptr @_ZN1A3fooEi, ptr @_ZN1A3barEf] }, align 8, !type !0, !type !1, !type !2, !vcall_visibility !339; CHECK: @_ZTV1B = internal unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr null, ptr @_ZN1B3fooEi, ptr null] }40@_ZTV1B = internal unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr null, ptr @_ZN1B3fooEi, ptr @_ZN1B3barEf] }, align 8, !type !0, !type !1, !type !2, !type !4, !type !5, !type !6, !vcall_visibility !341 42 43; CHECK-NOT: define internal i32 @_ZN1A3fooEi(44define internal i32 @_ZN1A3fooEi(ptr nocapture readnone %this, i32) unnamed_addr #1 align 2 {45entry:46 ret i32 147}48 49; CHECK-NOT: define internal i32 @_ZN1A3barEf(50define internal i32 @_ZN1A3barEf(ptr nocapture readnone %this, float) unnamed_addr #1 align 2 {51entry:52 ret i32 253}54 55; CHECK: define internal i32 @_ZN1B3fooEi(56define internal i32 @_ZN1B3fooEi(ptr nocapture readnone %this, i32) unnamed_addr #1 align 2 {57entry:58 ret i32 359}60 61; CHECK-NOT: define internal i32 @_ZN1B3barEf(62define internal i32 @_ZN1B3barEf(ptr nocapture readnone %this, float) unnamed_addr #1 align 2 {63entry:64 ret i32 465}66 67 68define hidden void @_ZN1AC2Ev(ptr nocapture %this) {69entry:70 store ptr getelementptr inbounds inrange(-16, 16) ({ [4 x ptr] }, ptr @_ZTV1A, i64 0, i32 0, i64 2), ptr %this, align 871 ret void72}73 74define hidden void @_ZN1BC2Ev(ptr nocapture %this) {75entry:76 store ptr getelementptr inbounds inrange(-16, 16) ({ [4 x ptr] }, ptr @_ZTV1B, i64 0, i32 0, i64 2), ptr %this, align 877 ret void78}79 80define hidden i32 @test(ptr %p, i64 %q.coerce0, i64 %q.coerce1) {81entry:82 %0 = getelementptr inbounds i8, ptr %p, i64 %q.coerce183 %1 = and i64 %q.coerce0, 184 %memptr.isvirtual = icmp eq i64 %1, 085 br i1 %memptr.isvirtual, label %memptr.nonvirtual, label %memptr.virtual86 87memptr.virtual: ; preds = %entry88 %vtable = load ptr, ptr %0, align 889 %2 = add i64 %q.coerce0, -190 %3 = getelementptr i8, ptr %vtable, i64 %2, !nosanitize !1291 %4 = tail call { ptr, i1 } @llvm.type.checked.load(ptr %3, i32 0, metadata !"_ZTSM1BFiiE.virtual"), !nosanitize !1292 %5 = extractvalue { ptr, i1 } %4, 0, !nosanitize !1293 br label %memptr.end94 95memptr.nonvirtual: ; preds = %entry96 %memptr.nonvirtualfn = inttoptr i64 %q.coerce0 to ptr97 br label %memptr.end98 99memptr.end: ; preds = %memptr.nonvirtual, %memptr.virtual100 %6 = phi ptr [ %5, %memptr.virtual ], [ %memptr.nonvirtualfn, %memptr.nonvirtual ]101 %call = tail call i32 %6(ptr %0, i32 42)102 ret i32 %call103}104 105declare { ptr, i1 } @llvm.type.checked.load(ptr, i32, metadata)106 107!llvm.module.flags = !{!7}108 109!0 = !{i64 16, !"_ZTS1A"}110!1 = !{i64 16, !"_ZTSM1AFiiE.virtual"}111!2 = !{i64 24, !"_ZTSM1AFifE.virtual"}112!3 = !{i64 2}113!4 = !{i64 16, !"_ZTS1B"}114!5 = !{i64 16, !"_ZTSM1BFiiE.virtual"}115!6 = !{i64 24, !"_ZTSM1BFifE.virtual"}116!7 = !{i32 1, !"Virtual Function Elim", i32 1}117!12 = !{}118