1; Third example from Doc/Coroutines.rst (two suspend points) 2; RUN: opt < %s -O2 -enable-coroutines -S | FileCheck %s 3; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -S | FileCheck %s 4 5define i8* @f(i32 %n) { 6entry: 7 %id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null) 8 %size = call i32 @llvm.coro.size.i32() 9 %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id) 10 br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin 11dyn.alloc: 12 %alloc = call i8* @malloc(i32 %size) 13 br label %coro.begin 14coro.begin: 15 %phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ] 16 %hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi) 17 br label %loop 18loop: 19 %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop.resume ] 20 call void @print(i32 %n.val) #4 21 %0 = call i8 @llvm.coro.suspend(token none, i1 false) 22 switch i8 %0, label %suspend [i8 0, label %loop.resume 23 i8 1, label %cleanup] 24loop.resume: 25 %inc = add nsw i32 %n.val, 1 26 %sub = xor i32 %n.val, -1 27 call void @print(i32 %sub) 28 %1 = call i8 @llvm.coro.suspend(token none, i1 false) 29 switch i8 %1, label %suspend [i8 0, label %loop 30 i8 1, label %cleanup] 31cleanup: 32 %mem = call i8* @llvm.coro.free(token %id, i8* %hdl) 33 call void @free(i8* %mem) 34 br label %suspend 35suspend: 36 call i1 @llvm.coro.end(i8* %hdl, i1 false) 37 ret i8* %hdl 38} 39 40; CHECK-LABEL: @main 41define i32 @main() { 42entry: 43 %hdl = call i8* @f(i32 4) 44 call void @llvm.coro.resume(i8* %hdl) 45 call void @llvm.coro.resume(i8* %hdl) 46 %c = ptrtoint i8* %hdl to i64 47 %to = icmp eq i64 %c, 0 48 br i1 %to, label %return, label %destroy 49destroy: 50 call void @llvm.coro.destroy(i8* %hdl) 51 br label %return 52return: 53 ret i32 0 54; CHECK-NOT: i8* @malloc 55; CHECK: call void @print(i32 4) 56; CHECK-NEXT: call void @print(i32 -5) 57; CHECK-NEXT: call void @print(i32 5) 58; CHECK: ret i32 0 59} 60 61declare i8* @malloc(i32) 62declare void @free(i8*) 63declare void @print(i32) 64 65declare token @llvm.coro.id(i32, i8*, i8*, i8*) 66declare i1 @llvm.coro.alloc(token) 67declare i32 @llvm.coro.size.i32() 68declare i8* @llvm.coro.begin(token, i8*) 69declare i8 @llvm.coro.suspend(token, i1) 70declare i8* @llvm.coro.free(token, i8*) 71declare i1 @llvm.coro.end(i8*, i1) 72 73declare void @llvm.coro.resume(i8*) 74declare void @llvm.coro.destroy(i8*) 75