d9308aa39b
See PR51862. The consumers of the Elidable flag in CXXConstructExpr assume that an elidable construction just goes through a single copy/move construction, so that the source object is immediately passed as an argument and is the same type as the parameter itself. With the implementation of P2266 and after some adjustments to the implementation of P1825, we started (correctly, as per standard) allowing more cases where the copy initialization goes through user defined conversions. With this patch we stop using this flag in NRVO contexts, to preserve code that relies on that assumption. This causes no known functional changes, we just stop firing some asserts in a cople of included test cases. Reviewed By: rsmith Differential Revision: https://reviews.llvm.org/D109800
322 lines
8.8 KiB
C++
322 lines
8.8 KiB
C++
// RUN: %clang_cc1 -std=c++20 -fblocks -Wno-return-stack-address -triple x86_64-unknown-unknown-gnu -emit-llvm -O1 -fexperimental-new-pass-manager -o - %s | FileCheck %s
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struct alignas(4) X {
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X();
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X(const X &);
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X(X &&);
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};
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#define L(A, B, C) void l##A() { \
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auto t = []<class T = X>() -> C { \
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T t; \
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return B; \
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}(); \
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}
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// CHECK-LABEL: define{{.*}} void @_Z2l1v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(1, t, X);
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// CHECK-LABEL: define{{.*}} void @_Z2l2v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(2, t, X&);
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// CHECK-LABEL: define{{.*}} void @_Z2l3v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(3, t, T);
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// CHECK-LABEL: define{{.*}} void @_Z2l4v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(4, t, T&);
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// CHECK-LABEL: define{{.*}} void @_Z2l5v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(5, t, auto);
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// CHECK-LABEL: define{{.*}} void @_Z2l6v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(6, t, auto&);
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// CHECK-LABEL: define{{.*}} void @_Z2l7v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(7, t, decltype(auto));
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// CHECK-LABEL: define{{.*}} void @_Z2l8v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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L(8, (t), decltype(auto));
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#undef L
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#define F(A, B, C) template<class T = X> static inline auto tf##A() -> C { \
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T t; \
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return B; \
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} \
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void f##A() { auto t = tf##A(); } \
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// CHECK-LABEL: define{{.*}} void @_Z2f1v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(1, t, X);
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// CHECK-LABEL: define{{.*}} void @_Z2f2v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(2, t, X&);
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// CHECK-LABEL: define{{.*}} void @_Z2f3v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(3, t, T);
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// CHECK-LABEL: define{{.*}} void @_Z2f4v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(4, t, T&);
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// CHECK-LABEL: define{{.*}} void @_Z2f5v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(5, t, auto);
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// CHECK-LABEL: define{{.*}} void @_Z2f6v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(6, t, auto&);
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// CHECK-LABEL: define{{.*}} void @_Z2f7v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(7, t, decltype(auto));
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// CHECK-LABEL: define{{.*}} void @_Z2f8v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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F(8, (t), decltype(auto));
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#undef F
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#define B(A, B) void b##A() { \
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auto t = []<class T = X>() { return ^ B () { \
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T t; \
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return t; \
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}; }()(); \
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}
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// CHECK-LABEL: define{{.*}} void @_Z2b1v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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B(1, X);
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// CHECK-LABEL: define{{.*}} void @_Z2b2v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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B(2, X&);
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// CHECK-LABEL: define{{.*}} void @_Z2b3v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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B(3, T);
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// CHECK-LABEL: define{{.*}} void @_Z2b4v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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B(4, T&);
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// CHECK-LABEL: define{{.*}} void @_Z2b5v
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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B(5, );
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#undef B
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// CHECK-LABEL: define{{.*}} void @_Z6f_attrv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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template<class T = X> [[gnu::cdecl]] static inline auto tf_attr() -> X {
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T t;
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return t;
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}
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void f_attr() { auto t = tf_attr(); }
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// CHECK-LABEL: define{{.*}} void @_Z6b_attrv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call void @llvm.lifetime.end
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// CHECK-NEXT: ret void
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void b_attr() {
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auto t = []<class T = X>() {
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return ^X() [[clang::vectorcall]] {
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T t;
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return t;
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};
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}()();
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}
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namespace test_alignas {
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template <int A> X t1() {
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X a [[gnu::aligned(A)]];
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return a;
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}
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t1ILi1EEE1Xv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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template X t1<1>();
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t1ILi4EEE1Xv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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template X t1<4>();
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t1ILi8EEE1Xv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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template X t1<8>();
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template <int A> X t2() {
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X a [[gnu::aligned(1)]] [[gnu::aligned(A)]] [[gnu::aligned(2)]];
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return a;
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}
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t2ILi1EEE1Xv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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template X t2<1>();
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t2ILi4EEE1Xv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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template X t2<4>();
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t2ILi8EEE1Xv
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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template X t2<8>();
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t3Ev
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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X t3() {
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X a [[gnu::aligned(1)]];
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return a;
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}
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t4Ev
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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X t4() {
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X a [[gnu::aligned(8)]];
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return a;
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}
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// CHECK-LABEL: define{{.*}} void @_ZN12test_alignas2t5Ev
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// CHECK: call {{.*}} @_ZN1XC1Ev
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// CHECK-NEXT: call {{.*}} @_ZN1XC1EOS_
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// CHECK-NEXT: call void @llvm.lifetime.end
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X t5() {
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X a [[gnu::aligned(1)]] [[gnu::aligned(8)]];
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return a;
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}
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} // namespace test_alignas
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namespace PR51862 {
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template <class T> T test() {
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T a;
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T b;
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if (0)
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return a;
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return b;
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}
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struct A {
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A();
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A(A &);
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A(int);
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operator int();
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};
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// CHECK-LABEL: define{{.*}} void @_ZN7PR518624testINS_1AEEET_v
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// CHECK: call i32 @_ZN7PR518621AcviEv
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// CHECK-NEXT: call void @_ZN7PR518621AC1Ei
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// CHECK-NEXT: call void @llvm.lifetime.end
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template A test<A>();
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struct BSub {};
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struct B : BSub {
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B();
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B(B &);
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B(const BSub &);
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};
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// CHECK-LABEL: define{{.*}} void @_ZN7PR518624testINS_1BEEET_v
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// CHECK: call void @_ZN7PR518621BC1ERKNS_4BSubE
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// CHECK-NEXT: call void @llvm.lifetime.end
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template B test<B>();
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} // namespace PR51862
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