derek.holloway
7502bf64a4
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52 lines
2.4 KiB
C++
52 lines
2.4 KiB
C++
// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++11 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++14 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | FileCheck %s --check-prefixes CHECK
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#if __cplusplus == 199711L
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#define static_assert(expr) __extension__ _Static_assert(expr)
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#define noexcept throw()
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#endif
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namespace cwg6 { // cwg6: 2.7
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#if __cplusplus >= 201103L
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struct Counter {
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int copies;
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constexpr Counter(int copies) : copies(copies) {}
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constexpr Counter(const Counter& other) : copies(other.copies + 1) {}
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};
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// Passing an lvalue by value makes a non-elidable copy.
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constexpr int PassByValue(Counter c) { return c.copies; }
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constexpr int PassByValue2(Counter c) { return PassByValue(c); }
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constexpr int PassByValue3(Counter c) { return PassByValue2(c); }
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static_assert(PassByValue(Counter(0)) == 0, "expect no copies");
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static_assert(PassByValue2(Counter(0)) == 1, "expect 1 copy");
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static_assert(PassByValue3(Counter(0)) == 2, "expect 2 copies");
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#endif
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struct A {
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A() noexcept;
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A(const A&) noexcept;
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~A() noexcept;
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};
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inline void f(A a) noexcept {}
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// CHECK-LABEL: define {{.*}} @_ZN4cwg64callEv
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void call() {
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A a;
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// We copy the parameter here, even though object is not mutated by f and
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// otherwise satisfies the criteria for the proposed CWG6 optimization.
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// CHECK: call {{.*}} @_ZN4cwg61AC1ERKS0_(
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// CHECK: call {{.*}} @_ZN4cwg61fENS_1AE(
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f(a);
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// CHECK: call {{.*}} @_ZN4cwg61AD1Ev(
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// CHECK: call {{.*}} @_ZN4cwg61AD1Ev(
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}
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} // namespace cwg6
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