d30ca5e2e2
This patch tries to implement RVO for coroutine's return object got from get_return_object. From [dcl.fct.def.coroutine]/p7 we could know that the return value of get_return_object is either a reference or a prvalue. So it makes sense to do copy elision for the return value. The return object should be constructed directly into the storage where they would otherwise be copied/moved to. Test Plan: folly, check-all Reviewed By: junparser Differential revision: https://reviews.llvm.org/D117087
35 lines
920 B
C++
35 lines
920 B
C++
// RUN: %clang_cc1 -std=c++20 -triple=x86_64-pc-windows-msvc18.0.0 -emit-llvm -o - %s -fexceptions -fcxx-exceptions -disable-llvm-passes | FileCheck %s
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// -triple=x86_64-unknown-linux-gnu
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#include "Inputs/coroutine.h"
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struct coro_t {
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void* p;
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~coro_t();
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struct promise_type {
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coro_t get_return_object();
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std::suspend_never initial_suspend();
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std::suspend_never final_suspend() noexcept;
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void return_void();
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promise_type();
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~promise_type();
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void unhandled_exception();
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};
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};
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struct Cleanup { ~Cleanup(); };
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void may_throw();
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coro_t f() {
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Cleanup cleanup;
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may_throw();
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co_return;
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}
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// CHECK-LABEL: define dso_local void @"?f@@YA?AUcoro_t@@XZ"(
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// CHECK: invoke noundef %"struct.coro_t::promise_type"* @"??0promise_type@coro_t@@QEAA@XZ"(
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// CHECK: invoke void @"?get_return_object@promise_type@coro_t@@QEAA?AU2@XZ"(
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// CHECK: call void @"??1promise_type@coro_t@@QEAA@XZ"
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