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 %s 3; RUN: opt < %s -passes='pgo-instr-gen,cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck --check-prefixes=CHECK %s 4 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) #3 9 %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 switch i8 %suspend, label %exit [ 17 i8 0, label %await.ready 18 i8 1, label %exit 19 ] 20await.ready: 21 %save2 = call token @llvm.coro.save(ptr null) 22 call void @llvm.coro.await.suspend.handle(ptr null, ptr null, ptr @await_suspend_function) 23 24 %suspend2 = call i8 @llvm.coro.suspend(token %save2, i1 false) 25 switch i8 %suspend2, label %exit [ 26 i8 0, label %exit 27 i8 1, label %exit 28 ] 29exit: 30 call i1 @llvm.coro.end(ptr null, i1 false, token none) 31 ret void 32} 33 34; Verify that in the initial function resume is not marked with musttail. 35; CHECK-LABEL: @f( 36; CHECK: %[[addr1:.+]] = call ptr @llvm.coro.subfn.addr(ptr null, i8 0) 37; CHECK-NOT: musttail call fastcc void %[[addr1]](ptr null) 38 39; Verify that in the resume part resume call is marked with musttail. 40; CHECK-LABEL: @f.resume( 41; CHECK: %[[addr2:.+]] = call ptr @llvm.coro.subfn.addr 42; CHECK-NEXT: musttail call fastcc void %[[addr2]] 43; CHECK-NEXT: ret void 44 45declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr) #1 46declare i1 @llvm.coro.alloc(token) #2 47declare i64 @llvm.coro.size.i64() #3 48declare ptr @llvm.coro.begin(token, ptr writeonly) #2 49declare token @llvm.coro.save(ptr) #2 50declare ptr @llvm.coro.frame() #3 51declare i8 @llvm.coro.suspend(token, i1) #2 52declare ptr @llvm.coro.free(token, ptr nocapture readonly) #1 53declare i1 @llvm.coro.end(ptr, i1, token) #2 54declare ptr @llvm.coro.subfn.addr(ptr nocapture readonly, i8) #1 55declare ptr @malloc(i64) 56declare ptr @await_suspend_function(ptr %awaiter, ptr %hdl) 57 58attributes #0 = { presplitcoroutine } 59attributes #1 = { argmemonly nounwind readonly } 60attributes #2 = { nounwind } 61attributes #3 = { nounwind readnone } 62