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1; Tests that coro-split will convert coro.await.suspend.handle to a musttail call.2; RUN: opt < %s -passes='cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck --check-prefixes=CHECK %s3; RUN: opt < %s -passes='pgo-instr-gen,cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck --check-prefixes=CHECK %s4 5define void @f() #0 {6entry:7 %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null)8 %alloc = call ptr @malloc(i64 16) #39 %vFrame = call noalias nonnull ptr @llvm.coro.begin(token %id, ptr %alloc)10 11 %save = call token @llvm.coro.save(ptr null)12 %addr1 = call ptr @llvm.coro.subfn.addr(ptr null, i8 0)13 call fastcc void %addr1(ptr null)14 15 %suspend = call i8 @llvm.coro.suspend(token %save, i1 false)16 %cmp = icmp eq i8 %suspend, 017 br i1 %cmp, label %await.suspend, label %exit18await.suspend:19 %save2 = call token @llvm.coro.save(ptr null)20 %br0 = call i8 @switch_result()21 switch i8 %br0, label %unreach [22 i8 0, label %await.resume323 i8 1, label %await.resume124 i8 2, label %await.resume225 ]26await.resume1:27 %hdl = call ptr @g()28 call void @llvm.coro.await.suspend.handle(ptr null, ptr %hdl, ptr @await_suspend_function)29 br label %final.suspend30await.resume2:31 %hdl2 = call ptr @h()32 call void @llvm.coro.await.suspend.handle(ptr null, ptr %hdl2, ptr @await_suspend_function)33 br label %final.suspend34await.resume3:35 call void @llvm.coro.await.suspend.handle(ptr null, ptr null, ptr @await_suspend_function)36 br label %final.suspend37final.suspend:38 %suspend2 = call i8 @llvm.coro.suspend(token %save2, i1 false)39 %cmp2 = icmp eq i8 %suspend2, 040 br i1 %cmp2, label %pre.exit, label %exit41pre.exit:42 br label %exit43exit:44 call void @llvm.coro.end(ptr null, i1 false, token none)45 ret void46unreach:47 unreachable48}49 50; Verify that in the initial function resume is not marked with musttail.51; CHECK-LABEL: @f(52; CHECK: %[[addr1:.+]] = call ptr @llvm.coro.subfn.addr(ptr null, i8 0)53; CHECK-NOT: musttail call fastcc void %[[addr1]](ptr null)54 55; Verify that in the resume part resume call is marked with musttail.56; CHECK-LABEL: @f.resume(57; CHECK: %[[hdl:.+]] = call ptr @g()58; CHECK-NEXT: call ptr @await_suspend_function59; CHECK-NEXT: %[[addr2:.+]] = call ptr @llvm.coro.subfn.addr60; CHECK-NEXT: musttail call fastcc void %[[addr2]]61; CHECK-NEXT: ret void62; CHECK: %[[hdl2:.+]] = call ptr @h()63; CHECK-NEXT: call ptr @await_suspend_function64; CHECK-NEXT: %[[addr3:.+]] = call ptr @llvm.coro.subfn.addr65; CHECK-NEXT: musttail call fastcc void %[[addr3]]66; CHECK-NEXT: ret void67; CHECK: call ptr @await_suspend_function68; CHECK: %[[addr4:.+]] = call ptr @llvm.coro.subfn.addr69; CHECK-NEXT: musttail call fastcc void %[[addr4]]70; CHECK-NEXT: ret void71 72 73declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr) #174declare i1 @llvm.coro.alloc(token) #275declare i64 @llvm.coro.size.i64() #376declare ptr @llvm.coro.begin(token, ptr writeonly) #277declare token @llvm.coro.save(ptr) #278declare ptr @llvm.coro.frame() #379declare i8 @llvm.coro.suspend(token, i1) #280declare ptr @llvm.coro.free(token, ptr nocapture readonly) #181declare void @llvm.coro.end(ptr, i1, token) #282declare ptr @llvm.coro.subfn.addr(ptr nocapture readonly, i8) #183declare ptr @malloc(i64)84declare i8 @switch_result()85declare ptr @g()86declare ptr @h()87declare ptr @await_suspend_function(ptr %awaiter, ptr %hdl)88 89attributes #0 = { presplitcoroutine }90attributes #1 = { argmemonly nounwind readonly }91attributes #2 = { nounwind }92attributes #3 = { nounwind readnone }93