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1; Fourth example from Doc/Coroutines.rst (coroutine promise)2; RUN: opt < %s -passes='default<O2>' -S | FileCheck %s3 4define ptr @f(i32 %n) presplitcoroutine {5entry:6 %promise = alloca i327 %id = call token @llvm.coro.id(i32 0, ptr %promise, ptr null, ptr null)8 %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)9 br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin10dyn.alloc:11 %size = call i32 @llvm.coro.size.i32()12 %alloc = call ptr @malloc(i32 %size)13 br label %coro.begin14coro.begin:15 %phi = phi ptr [ null, %entry ], [ %alloc, %dyn.alloc ]16 %hdl = call noalias ptr @llvm.coro.begin(token %id, ptr %phi)17 br label %loop18loop:19 %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop ]20 %inc = add nsw i32 %n.val, 121 store i32 %n.val, ptr %promise22 %0 = call i8 @llvm.coro.suspend(token none, i1 false)23 switch i8 %0, label %suspend [i8 0, label %loop24 i8 1, label %cleanup]25cleanup:26 %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)27 call void @free(ptr %mem)28 br label %suspend29suspend:30 call void @llvm.coro.end(ptr %hdl, i1 false, token none)31 ret ptr %hdl32}33 34; CHECK-LABEL: @main35define i32 @main() {36entry:37 %hdl = call ptr @f(i32 4)38 %promise.addr.raw = call ptr @llvm.coro.promise(ptr %hdl, i32 4, i1 false)39 %val0 = load i32, ptr %promise.addr.raw40 call void @print(i32 %val0)41 call void @llvm.coro.resume(ptr %hdl)42 %val1 = load i32, ptr %promise.addr.raw43 call void @print(i32 %val1)44 call void @llvm.coro.resume(ptr %hdl)45 %val2 = load i32, ptr %promise.addr.raw46 call void @print(i32 %val2)47 call void @llvm.coro.destroy(ptr %hdl)48 ret i32 049; CHECK: call void @print(i32 4)50; CHECK-NEXT: call void @print(i32 5)51; CHECK-NEXT: call void @print(i32 6)52; CHECK: ret i32 053}54 55declare ptr @llvm.coro.promise(ptr, i32, i1)56declare ptr @malloc(i32)57declare void @free(ptr)58declare void @print(i32)59 60declare token @llvm.coro.id(i32, ptr, ptr, ptr)61declare i1 @llvm.coro.alloc(token)62declare i32 @llvm.coro.size.i32()63declare ptr @llvm.coro.begin(token, ptr)64declare i8 @llvm.coro.suspend(token, i1)65declare ptr @llvm.coro.free(token, ptr)66declare void @llvm.coro.end(ptr, i1, token)67 68declare void @llvm.coro.resume(ptr)69declare void @llvm.coro.destroy(ptr)70