| ; Second example from Doc/Coroutines.rst (custom alloc and free functions) |
| ; RUN: opt < %s -passes='default<O2>' -S | FileCheck %s |
| |
| define ptr @f(i32 %n) presplitcoroutine { |
| entry: |
| %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null) |
| %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id) |
| br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin |
| dyn.alloc: |
| %size = call i32 @llvm.coro.size.i32() |
| %alloc = call ptr @CustomAlloc(i32 %size) |
| br label %coro.begin |
| coro.begin: |
| %phi = phi ptr [ null, %entry ], [ %alloc, %dyn.alloc ] |
| %hdl = call noalias ptr @llvm.coro.begin(token %id, ptr %phi) |
| br label %loop |
| loop: |
| %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop ] |
| %inc = add nsw i32 %n.val, 1 |
| call void @print(i32 %n.val) |
| %0 = call i8 @llvm.coro.suspend(token none, i1 false) |
| switch i8 %0, label %suspend [i8 0, label %loop |
| i8 1, label %cleanup] |
| cleanup: |
| %mem = call ptr @llvm.coro.free(token %id, ptr %hdl) |
| %need.dyn.free = icmp ne ptr %mem, null |
| br i1 %need.dyn.free, label %dyn.free, label %suspend |
| dyn.free: |
| call void @CustomFree(ptr %mem) |
| br label %suspend |
| suspend: |
| call i1 @llvm.coro.end(ptr %hdl, i1 false, token none) |
| ret ptr %hdl |
| } |
| |
| ; CHECK-LABEL: @main |
| define i32 @main() { |
| entry: |
| %hdl = call ptr @f(i32 4) |
| call void @llvm.coro.resume(ptr %hdl) |
| call void @llvm.coro.resume(ptr %hdl) |
| %to = icmp eq ptr %hdl, null |
| br i1 %to, label %return, label %destroy |
| destroy: |
| call void @llvm.coro.destroy(ptr %hdl) |
| br label %return |
| return: |
| ret i32 0 |
| ; CHECK-NOT: call ptr @CustomAlloc |
| ; CHECK: call void @print(i32 4) |
| ; CHECK-NEXT: call void @print(i32 5) |
| ; CHECK-NEXT: call void @print(i32 6) |
| ; CHECK-NEXT: ret i32 0 |
| } |
| |
| declare ptr @CustomAlloc(i32) |
| declare void @CustomFree(ptr) |
| declare void @print(i32) |
| |
| declare token @llvm.coro.id(i32, ptr, ptr, ptr) |
| declare i1 @llvm.coro.alloc(token) |
| declare i32 @llvm.coro.size.i32() |
| declare ptr @llvm.coro.begin(token, ptr) |
| declare i8 @llvm.coro.suspend(token, i1) |
| declare ptr @llvm.coro.free(token, ptr) |
| declare i1 @llvm.coro.end(ptr, i1, token) |
| |
| declare void @llvm.coro.resume(ptr) |
| declare void @llvm.coro.destroy(ptr) |