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; Third example from Doc/Coroutines.rst (two suspend points)
; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -S | FileCheck %s
define i8* @f(i32 %n) "coroutine.presplit"="0" {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
dyn.alloc:
%alloc = call i8* @malloc(i32 %size)
br label %coro.begin
coro.begin:
%phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
br label %loop
loop:
%n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop.resume ]
call void @print(i32 %n.val) #4
%0 = call i8 @llvm.coro.suspend(token none, i1 false)
switch i8 %0, label %suspend [i8 0, label %loop.resume
i8 1, label %cleanup]
loop.resume:
%inc = add nsw i32 %n.val, 1
%sub = xor i32 %n.val, -1
call void @print(i32 %sub)
%1 = call i8 @llvm.coro.suspend(token none, i1 false)
switch i8 %1, label %suspend [i8 0, label %loop
i8 1, label %cleanup]
cleanup:
%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
call void @free(i8* %mem)
br label %suspend
suspend:
call i1 @llvm.coro.end(i8* %hdl, i1 false)
ret i8* %hdl
}
; CHECK-LABEL: @main
define i32 @main() {
entry:
%hdl = call i8* @f(i32 4)
call void @llvm.coro.resume(i8* %hdl)
call void @llvm.coro.resume(i8* %hdl)
%c = ptrtoint i8* %hdl to i64
%to = icmp eq i64 %c, 0
br i1 %to, label %return, label %destroy
destroy:
call void @llvm.coro.destroy(i8* %hdl)
br label %return
return:
ret i32 0
; CHECK-NOT: i8* @malloc
; CHECK: call void @print(i32 4)
; CHECK-NEXT: call void @print(i32 -5)
; CHECK-NEXT: call void @print(i32 5)
; CHECK: ret i32 0
}
declare i8* @malloc(i32)
declare void @free(i8*)
declare void @print(i32)
declare token @llvm.coro.id(i32, i8*, i8*, i8*)
declare i1 @llvm.coro.alloc(token)
declare i32 @llvm.coro.size.i32()
declare i8* @llvm.coro.begin(token, i8*)
declare i8 @llvm.coro.suspend(token, i1)
declare i8* @llvm.coro.free(token, i8*)
declare i1 @llvm.coro.end(i8*, i1)
declare void @llvm.coro.resume(i8*)
declare void @llvm.coro.destroy(i8*)
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