clang/test/CodeGenCoroutines/coro-dest-slot.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
   2
   3 #include "Inputs/coroutine.h"
   4
   5 using namespace std;
   6
   7 struct coro {
   8   struct promise_type {
   9     coro get_return_object();
  10     suspend_always initial_suspend();
  11     suspend_never final_suspend() noexcept;
  12     void return_void();
  13     static void unhandled_exception();
  14   };
  15 };
  16
  17 extern "C" coro f(int) { co_return; }
  18 // Verify that cleanup.dest.slot is eliminated in a coroutine.
  19 // CHECK-LABEL: f(
  20 // CHECK: %[[INIT_SUSPEND:.+]] = call i8 @llvm.coro.suspend(
  21 // CHECK-NEXT: switch i8 %[[INIT_SUSPEND]], label
  22 // CHECK-NEXT:   i8 0, label %[[INIT_READY:.+]]
  23 // CHECK-NEXT:   i8 1, label %[[INIT_CLEANUP:.+]]
  24 // CHECK-NEXT: ]
  25 // CHECK: %[[CLEANUP_DEST0:.+]] = phi i32 [ 0, %[[INIT_READY]] ], [ 2, %[[INIT_CLEANUP]] ]
  26
  27 // CHECK: %[[FINAL_SUSPEND:.+]] = call i8 @llvm.coro.suspend(
  28 // CHECK-NEXT: switch i8 %{{.*}}, label %coro.ret [
  29 // CHECK-NEXT:   i8 0, label %[[FINAL_READY:.+]]
  30 // CHECK-NEXT:   i8 1, label %[[FINAL_CLEANUP:.+]]
  31 // CHECK-NEXT: ]
  32
  33 // CHECK: call void @_ZNSt13suspend_never12await_resumeEv(
  34 // CHECK: %[[CLEANUP_DEST1:.+]] = phi i32 [ 0, %[[FINAL_READY]] ], [ 2, %[[FINAL_CLEANUP]] ]
  35 // CHECK: %[[CLEANUP_DEST2:.+]] = phi i32 [ %[[CLEANUP_DEST0]], %{{.+}} ], [ %[[CLEANUP_DEST1]], %{{.+}} ], [ 0, %{{.+}} ]
  36 // CHECK: call ptr @llvm.coro.free(
  37 // CHECK: switch i32 %[[CLEANUP_DEST2]], label %{{.+}} [
  38 // CHECK-NEXT: i32 0
  39 // CHECK-NEXT: i32 2
  40 // CHECK-NEXT: ]