60 lines
2.4 KiB
LLVM
60 lines
2.4 KiB
LLVM
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; Test for PR45393: Two virtual functions that return unique i1 values
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; in the same vtable. Both calls are optimized to a comparison of
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; this's vptr against the address of the vtable. When nesting these
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; checks, LLVM would previously assume the nested check always fails,
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; but that assumption does not hold if both checks refer to the same vtable.
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; This tests checks that this case is handled correctly.
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;
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; RUN: opt -S -wholeprogramdevirt -wholeprogramdevirt-summary-action=import \
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; RUN: -wholeprogramdevirt-read-summary=%p/Inputs/unique-retval-same-vtable.yaml \
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; RUN: -O2 -o - %s | FileCheck %s
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;
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; Check that C::f() contains both possible return values.
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; CHECK-LABEL: define {{.*}} @_ZNK1C1fEv
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; CHECK-NOT: }
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; CHECK: 20074028
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; CHECK-NOT: }
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; CHECK: 1008434
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%class.C = type { i32 (...)** }
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define hidden i32 @_ZNK1C1fEv(%class.C* %this) {
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entry:
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%0 = bitcast %class.C* %this to i1 (%class.C*)***
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%vtable = load i1 (%class.C*)**, i1 (%class.C*)*** %0
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%1 = bitcast i1 (%class.C*)** %vtable to i8*
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%2 = tail call i1 @llvm.type.test(i8* %1, metadata !"_ZTS1C")
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tail call void @llvm.assume(i1 %2)
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%vfn = getelementptr inbounds i1 (%class.C*)*, i1 (%class.C*)** %vtable, i64 2
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%3 = load i1 (%class.C*)*, i1 (%class.C*)** %vfn
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%call = tail call zeroext i1 %3(%class.C* %this)
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br i1 %call, label %if.then, label %return
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if.then:
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%vtable2 = load i1 (%class.C*)**, i1 (%class.C*)*** %0
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%4 = bitcast i1 (%class.C*)** %vtable2 to i8*
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%5 = tail call i1 @llvm.type.test(i8* %4, metadata !"_ZTS1C")
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tail call void @llvm.assume(i1 %5)
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%vfn3 = getelementptr inbounds i1 (%class.C*)*, i1 (%class.C*)** %vtable2, i64 3
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%6 = load i1 (%class.C*)*, i1 (%class.C*)** %vfn3
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; The method being called here and the method being called before
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; the branch above both return true in the same vtable and only that
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; vtable. Therefore, if this call is reached, we must select
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; 20074028. Earlier versions of LLVM mistakenly concluded that
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; this code *never* selects 200744028.
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%call4 = tail call zeroext i1 %6(%class.C* nonnull %this)
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%. = select i1 %call4, i32 20074028, i32 3007762
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br label %return
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return:
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%retval.0 = phi i32 [ %., %if.then ], [ 1008434, %entry ]
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ret i32 %retval.0
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}
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declare i1 @llvm.type.test(i8*, metadata)
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declare void @llvm.assume(i1)
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