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04491bd8f3
Summary: We don't want to store cleanup dest slot saved into the coroutine frame (as some of the cleanup code may access them after coroutine frame destroyed). This is an alternative to https://reviews.llvm.org/D37093 It is possible to do this for all functions, but, cursory check showed that in -O0, we get slightly longer function (by 1-3 instructions), thus, we are only limiting cleanup.dest.slot elimination to coroutines. Reviewers: rjmccall, hfinkel, eric_niebler Reviewed By: eric_niebler Subscribers: EricWF, cfe-commits Differential Revision: https://reviews.llvm.org/D39768 llvm-svn: 317981
27 lines
865 B
C++
27 lines
865 B
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++14 -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
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#include "Inputs/coroutine.h"
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using namespace std::experimental;
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struct coro {
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struct promise_type {
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coro get_return_object();
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suspend_always initial_suspend();
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suspend_never final_suspend();
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void return_void();
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static void unhandled_exception();
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};
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};
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extern "C" coro f(int) { co_return; }
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// Verify that cleanup.dest.slot is eliminated in a coroutine.
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// CHECK-LABEL: f(
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// CHECK: call void @_ZNSt12experimental13coroutines_v113suspend_never12await_resumeEv(
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// CHECK: %[[CLEANUP_DEST:.+]] = phi i32 [ 0, %{{.+}} ], [ 2, %{{.+}} ], [ 2, %{{.+}} ]
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// CHECK: call i8* @llvm.coro.free(
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// CHECK: switch i32 %cleanup.dest.slot.0, label %{{.+}} [
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// CHECK-NEXT: i32 0
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// CHECK-NEXT: i32 2
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// CHECK-NEXT: ]
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