forked from OSchip/llvm-project
78 lines
2.3 KiB
LLVM
78 lines
2.3 KiB
LLVM
; RUN: opt < %s -passes=globaldce -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; struct A {
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; A();
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; virtual int foo();
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; };
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;
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; struct B : A {
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; B();
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; virtual int foo();
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; };
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;
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; A::A() {}
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; B::B() {}
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; int A::foo() { return 42; }
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; int B::foo() { return 1337; }
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;
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; extern "C" int test(A *p) { return p->foo(); }
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; The virtual call in test could be dispatched to either A::foo or B::foo, so
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; both must be retained.
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%struct.A = type { ptr }
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%struct.B = type { %struct.A }
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; CHECK: @_ZTV1A = internal unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN1A3fooEv] }
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@_ZTV1A = internal unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN1A3fooEv] }, align 8, !type !0, !type !1, !vcall_visibility !2
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; CHECK: @_ZTV1B = internal unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN1B3fooEv] }
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@_ZTV1B = internal unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr null, ptr @_ZN1B3fooEv] }, align 8, !type !0, !type !1, !type !3, !type !4, !vcall_visibility !2
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; CHECK: define internal i32 @_ZN1A3fooEv(
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define internal i32 @_ZN1A3fooEv(ptr nocapture readnone %this) {
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entry:
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ret i32 42
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}
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; CHECK: define internal i32 @_ZN1B3fooEv(
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define internal i32 @_ZN1B3fooEv(ptr nocapture readnone %this) {
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entry:
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ret i32 1337
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}
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define hidden void @_ZN1AC2Ev(ptr nocapture %this) {
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entry:
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store ptr getelementptr inbounds ({ [3 x ptr] }, ptr @_ZTV1A, i64 0, inrange i32 0, i64 2), ptr %this, align 8
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ret void
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}
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define hidden void @_ZN1BC2Ev(ptr nocapture %this) {
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entry:
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store ptr getelementptr inbounds ({ [3 x ptr] }, ptr @_ZTV1B, i64 0, inrange i32 0, i64 2), ptr %this, align 8
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ret void
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}
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define hidden i32 @test(ptr %p) {
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entry:
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%vtable1 = load ptr, ptr %p, align 8
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%0 = tail call { ptr, i1 } @llvm.type.checked.load(ptr %vtable1, i32 0, metadata !"_ZTS1A"), !nosanitize !10
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%1 = extractvalue { ptr, i1 } %0, 0, !nosanitize !10
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%call = tail call i32 %1(ptr %p)
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ret i32 %call
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}
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declare { ptr, i1 } @llvm.type.checked.load(ptr, i32, metadata) #2
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!llvm.module.flags = !{!5}
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!0 = !{i64 16, !"_ZTS1A"}
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!1 = !{i64 16, !"_ZTSM1AFivE.virtual"}
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!2 = !{i64 2}
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!3 = !{i64 16, !"_ZTS1B"}
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!4 = !{i64 16, !"_ZTSM1BFivE.virtual"}
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!5 = !{i32 1, !"Virtual Function Elim", i32 1}
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!10 = !{}
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