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 %s 3; RUN: opt < %s -passes='pgo-instr-gen,cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck %s 4 5declare void @fakeresume1(ptr align 8) 6 7define void @g() #0 { 8entry: 9 %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null) 10 %alloc = call ptr @malloc(i64 16) #3 11 %alloc.var = alloca i8 12 call void @llvm.lifetime.start.p0(i64 1, ptr %alloc.var) 13 %vFrame = call noalias nonnull ptr @llvm.coro.begin(token %id, ptr %alloc) 14 15 %save = call token @llvm.coro.save(ptr null) 16 %suspend = call i8 @llvm.coro.suspend(token %save, i1 false) 17 18 switch i8 %suspend, label %exit [ 19 i8 0, label %await.suspend 20 i8 1, label %exit 21 ] 22await.suspend: 23 %save2 = call token @llvm.coro.save(ptr null) 24 call void @llvm.coro.await.suspend.handle(ptr null, ptr null, ptr @await_suspend_function) 25 %suspend2 = call i8 @llvm.coro.suspend(token %save2, i1 false) 26 switch i8 %suspend2, label %exit [ 27 i8 0, label %await.ready 28 i8 1, label %exit 29 ] 30await.ready: 31 call void @consume(ptr %alloc.var) 32 call void @llvm.lifetime.end.p0(i64 1, ptr %alloc.var) 33 br label %exit 34exit: 35 call i1 @llvm.coro.end(ptr null, i1 false, token none) 36 ret void 37} 38 39; Verify that in the resume part resume call is marked with musttail. 40; CHECK-LABEL: @g.resume( 41; CHECK: musttail call fastcc void 42; CHECK-NEXT: ret void 43 44declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr) #1 45declare i1 @llvm.coro.alloc(token) #2 46declare i64 @llvm.coro.size.i64() #3 47declare ptr @llvm.coro.begin(token, ptr writeonly) #2 48declare token @llvm.coro.save(ptr) #2 49declare ptr @llvm.coro.frame() #3 50declare i8 @llvm.coro.suspend(token, i1) #2 51declare ptr @llvm.coro.free(token, ptr nocapture readonly) #1 52declare i1 @llvm.coro.end(ptr, i1, token) #2 53declare ptr @llvm.coro.subfn.addr(ptr nocapture readonly, i8) #1 54declare ptr @malloc(i64) 55declare void @consume(ptr) 56declare void @llvm.lifetime.start.p0(i64, ptr nocapture) 57declare void @llvm.lifetime.end.p0(i64, ptr nocapture) 58declare ptr @await_suspend_function(ptr %awaiter, ptr %hdl) 59 60attributes #0 = { presplitcoroutine } 61attributes #1 = { argmemonly nounwind readonly } 62attributes #2 = { nounwind } 63attributes #3 = { nounwind readnone } 64