01d8e09fdb
When generating ctor, FieldMemcpyizer wrongly treated zero-sized class members as what should be copied, and generated wrong memcpy size under some special circumstances. This patch tries to fix it. Reviewed By: MaskRay, rjmccall Differential Revision: https://reviews.llvm.org/D70671
26 lines
739 B
C++
26 lines
739 B
C++
// RUN: %clang_cc1 -std=c++2a %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s
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struct TriviallyCopyable {};
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struct NonTriviallyCopyable {
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NonTriviallyCopyable() = default;
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NonTriviallyCopyable(const NonTriviallyCopyable&) = default;
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NonTriviallyCopyable(NonTriviallyCopyable &&) {}
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};
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struct Foo {
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int i;
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[[no_unique_address]] TriviallyCopyable m;
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[[no_unique_address]] NonTriviallyCopyable n;
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};
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void call() {
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Foo foo;
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Foo foo2(static_cast<Foo&&>(foo));
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}
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// The memcpy call should copy exact 4 bytes for member 'int i'
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// CHECK: define {{.*}} void @_ZN3FooC2EOS_
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// CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.+}}, i8* {{.+}}, i64 4, i1 false)
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// CHECK: call void @_ZN20NonTriviallyCopyableC2EOS_
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