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1; Second example from Doc/Coroutines.rst (custom alloc and free functions)2; RUN: opt < %s -passes='default<O2>' -S | FileCheck %s3 4define ptr @f(i32 %n) presplitcoroutine {5entry:6 %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null)7 %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)8 br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin9dyn.alloc:10 %size = call i32 @llvm.coro.size.i32()11 %alloc = call ptr @CustomAlloc(i32 %size)12 br label %coro.begin13coro.begin:14 %phi = phi ptr [ null, %entry ], [ %alloc, %dyn.alloc ]15 %hdl = call noalias ptr @llvm.coro.begin(token %id, ptr %phi)16 br label %loop17loop:18 %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop ]19 %inc = add nsw i32 %n.val, 120 call void @print(i32 %n.val)21 %0 = call i8 @llvm.coro.suspend(token none, i1 false)22 switch i8 %0, label %suspend [i8 0, label %loop23 i8 1, label %cleanup]24cleanup:25 %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)26 %need.dyn.free = icmp ne ptr %mem, null27 br i1 %need.dyn.free, label %dyn.free, label %suspend28dyn.free:29 call void @CustomFree(ptr %mem)30 br label %suspend31suspend:32 call void @llvm.coro.end(ptr %hdl, i1 false, token none)33 ret ptr %hdl34}35 36; CHECK-LABEL: @main37define i32 @main() {38entry:39 %hdl = call ptr @f(i32 4)40 call void @llvm.coro.resume(ptr %hdl)41 call void @llvm.coro.resume(ptr %hdl)42 %to = icmp eq ptr %hdl, null43 br i1 %to, label %return, label %destroy44destroy:45 call void @llvm.coro.destroy(ptr %hdl)46 br label %return47return:48 ret i32 049; CHECK-NOT: call ptr @CustomAlloc50; CHECK: call void @print(i32 4)51; CHECK-NEXT: call void @print(i32 5)52; CHECK-NEXT: call void @print(i32 6)53; CHECK-NEXT: ret i32 054}55 56declare ptr @CustomAlloc(i32)57declare void @CustomFree(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