| ; Tests that coro-split will convert coro.resume followed by a suspend to a |
| ; musttail call. |
| ; RUN: opt < %s -passes='cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck %s |
| |
| define void @f() #0 { |
| entry: |
| %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null) |
| %alloc = call ptr @malloc(i64 16) #3 |
| %vFrame = call noalias nonnull ptr @llvm.coro.begin(token %id, ptr %alloc) |
| |
| %save = call token @llvm.coro.save(ptr null) |
| %addr1 = call ptr @llvm.coro.subfn.addr(ptr null, i8 0) |
| call fastcc void %addr1(ptr null) |
| |
| %suspend = call i8 @llvm.coro.suspend(token %save, i1 false) |
| switch i8 %suspend, label %exit [ |
| i8 0, label %await.suspend |
| i8 1, label %exit |
| ] |
| await.suspend: |
| %save2 = call token @llvm.coro.save(ptr null) |
| %br0 = call i8 @switch_result() |
| switch i8 %br0, label %unreach [ |
| i8 0, label %await.resume3 |
| i8 1, label %await.resume1 |
| i8 2, label %await.resume2 |
| ] |
| await.resume1: |
| %hdl = call ptr @g() |
| %addr2 = call ptr @llvm.coro.subfn.addr(ptr %hdl, i8 0) |
| call fastcc void %addr2(ptr %hdl) |
| br label %final.suspend |
| await.resume2: |
| %hdl2 = call ptr @h() |
| %addr3 = call ptr @llvm.coro.subfn.addr(ptr %hdl2, i8 0) |
| call fastcc void %addr3(ptr %hdl2) |
| br label %final.suspend |
| await.resume3: |
| %addr4 = call ptr @llvm.coro.subfn.addr(ptr null, i8 0) |
| call fastcc void %addr4(ptr null) |
| br label %final.suspend |
| final.suspend: |
| %suspend2 = call i8 @llvm.coro.suspend(token %save2, i1 false) |
| switch i8 %suspend2, label %exit [ |
| i8 0, label %pre.exit |
| i8 1, label %exit |
| ] |
| pre.exit: |
| br label %exit |
| exit: |
| call i1 @llvm.coro.end(ptr null, i1 false, token none) |
| ret void |
| unreach: |
| unreachable |
| } |
| |
| ; Verify that in the initial function resume is not marked with musttail. |
| ; CHECK-LABEL: @f( |
| ; CHECK: %[[addr1:.+]] = call ptr @llvm.coro.subfn.addr(ptr null, i8 0) |
| ; CHECK-NOT: musttail call fastcc void %[[addr1]](ptr null) |
| |
| ; Verify that in the resume part resume call is marked with musttail. |
| ; CHECK-LABEL: @f.resume( |
| ; CHECK: %[[hdl:.+]] = call ptr @g() |
| ; CHECK-NEXT: %[[addr2:.+]] = call ptr @llvm.coro.subfn.addr(ptr %[[hdl]], i8 0) |
| ; CHECK-NEXT: musttail call fastcc void %[[addr2]](ptr %[[hdl]]) |
| ; CHECK-NEXT: ret void |
| ; CHECK: %[[hdl2:.+]] = call ptr @h() |
| ; CHECK-NEXT: %[[addr3:.+]] = call ptr @llvm.coro.subfn.addr(ptr %[[hdl2]], i8 0) |
| ; CHECK-NEXT: musttail call fastcc void %[[addr3]](ptr %[[hdl2]]) |
| ; CHECK-NEXT: ret void |
| ; CHECK: %[[addr4:.+]] = call ptr @llvm.coro.subfn.addr(ptr null, i8 0) |
| ; CHECK-NEXT: musttail call fastcc void %[[addr4]](ptr null) |
| ; CHECK-NEXT: ret void |
| |
| |
| |
| declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr) #1 |
| declare i1 @llvm.coro.alloc(token) #2 |
| declare i64 @llvm.coro.size.i64() #3 |
| declare ptr @llvm.coro.begin(token, ptr writeonly) #2 |
| declare token @llvm.coro.save(ptr) #2 |
| declare ptr @llvm.coro.frame() #3 |
| declare i8 @llvm.coro.suspend(token, i1) #2 |
| declare ptr @llvm.coro.free(token, ptr nocapture readonly) #1 |
| declare i1 @llvm.coro.end(ptr, i1, token) #2 |
| declare ptr @llvm.coro.subfn.addr(ptr nocapture readonly, i8) #1 |
| declare ptr @malloc(i64) |
| declare i8 @switch_result() |
| declare ptr @g() |
| declare ptr @h() |
| |
| attributes #0 = { presplitcoroutine } |
| attributes #1 = { argmemonly nounwind readonly } |
| attributes #2 = { nounwind } |
| attributes #3 = { nounwind readnone } |