derek.holloway
7502bf64a4
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74 lines
3.1 KiB
C++
74 lines
3.1 KiB
C++
// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu \
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// RUN: -fclangir -emit-cir %s -o %t.cir
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// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
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// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu \
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// RUN: -fclangir -emit-llvm %s -o %t.ll
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// RUN: FileCheck --check-prefix=LLVM --input-file=%t.ll %s
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// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu \
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// RUN: -emit-llvm %s -o %t.og.ll
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// RUN: FileCheck --check-prefix=OGCG --input-file=%t.og.ll %s
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// Test that emitAggregateCopy uses the data size (excluding tail padding)
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// when copying potentially-overlapping subobjects, and uses full type size
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// otherwise.
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struct Base { int x; };
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struct HasPadding : Base {
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char c;
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// sizeof(HasPadding) = 8 (4 for x, 1 for c, 3 tail padding)
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// data size = 5
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};
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struct VBase { int v; };
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// Outer has a virtual base, so its nvsize (14) is smaller than its full
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// sizeof (24). Because [[no_unique_address]] HasPadding extends beyond
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// nvsize (offset 8 + sizeof 8 = 16 > 14), getOverlapForFieldInit returns
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// MayOverlap, and emitAggregateCopy must use the data size (5) instead of
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// the full sizeof (8).
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struct Outer : virtual VBase {
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[[no_unique_address]] HasPadding hp;
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char extra;
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Outer(const HasPadding &hp, char e) : hp(hp), extra(e) {}
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};
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// With virtual bases, only the C1 (complete) constructor is emitted.
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// CIR-LABEL: cir.func {{.*}} @_ZN5OuterC1ERK10HasPaddingc(
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// CIR: cir.copy %{{.+}} to %{{.+}} skip_tail_padding : !cir.ptr<!rec_HasPadding>
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// LLVM-LABEL: define {{.*}} void @_ZN5OuterC1ERK10HasPaddingc(
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// LLVM: %[[GEP:.*]] = getelementptr inbounds nuw %struct.Outer, ptr %{{.+}}, i32 0, i32 1
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// LLVM: call void @llvm.memcpy.p0.p0.i64(ptr %[[GEP]], ptr %{{.+}}, i64 5, i1 false)
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// OGCG-LABEL: define {{.*}} void @_ZN5OuterC1ERK10HasPaddingc(
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// OGCG: %[[GEP:.*]] = getelementptr inbounds nuw %struct.Outer, ptr %{{.+}}, i32 0, i32 1
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// OGCG: call void @llvm.memcpy.p0.p0.i64(ptr {{.*}} %[[GEP]], ptr {{.*}} %{{.+}}, i64 5, i1 false)
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void test_overlap(const HasPadding &hp) {
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Outer o(hp, 'x');
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}
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// NonOverlapping does NOT have [[no_unique_address]], so the copy uses
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// cir.copy (full type size) rather than cir.libc.memcpy.
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struct NonOverlapping {
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HasPadding hp;
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char extra;
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NonOverlapping(const HasPadding &hp, char e) : hp(hp), extra(e) {}
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};
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// CIR-LABEL: cir.func {{.*}} @_ZN14NonOverlappingC2ERK10HasPaddingc(
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// CIR: cir.copy %{{.+}} to %{{.+}} : !cir.ptr<!rec_HasPadding>
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// LLVM-LABEL: define {{.*}} void @_ZN14NonOverlappingC2ERK10HasPaddingc(
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// LLVM: %[[GEP:.*]] = getelementptr inbounds nuw %struct.NonOverlapping, ptr %{{.+}}, i32 0, i32 0
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// LLVM: call void @llvm.memcpy.p0.p0.i64(ptr %[[GEP]], ptr %{{.+}}, i64 8, i1 false)
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// OGCG-LABEL: define {{.*}} void @_ZN14NonOverlappingC2ERK10HasPaddingc(
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// OGCG: %[[GEP:.*]] = getelementptr inbounds nuw %struct.NonOverlapping, ptr %{{.+}}, i32 0, i32 0
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// OGCG: call void @llvm.memcpy.p0.p0.i64(ptr {{.*}} %[[GEP]], ptr {{.*}} %{{.+}}, i64 8, i1 false)
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void test_no_overlap(const HasPadding &hp) {
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NonOverlapping o(hp, 'x');
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}
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