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; Fifth example from Doc/Coroutines.rst (final suspend)
; RUN: opt < %s -O2 -enable-coroutines -S | FileCheck %s
define i8* @f(i32 %n) {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %alloc)
br label %while.cond
while.cond:
%n.val = phi i32 [ %n, %entry ], [ %dec, %while.body ]
%cmp = icmp sgt i32 %n.val, 0
br i1 %cmp, label %while.body, label %while.end
while.body:
%dec = add nsw i32 %n.val, -1
call void @print(i32 %n.val) #4
%s = call i8 @llvm.coro.suspend(token none, i1 false)
switch i8 %s, label %suspend [i8 0, label %while.cond
i8 1, label %cleanup]
while.end:
%s.final = call i8 @llvm.coro.suspend(token none, i1 true)
switch i8 %s.final, label %suspend [i8 0, label %trap
i8 1, label %cleanup]
trap:
call void @llvm.trap()
unreachable
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
}
declare noalias i8* @malloc(i32)
declare void @print(i32)
declare void @llvm.trap()
declare void @free(i8* nocapture)
declare token @llvm.coro.id( i32, i8*, i8*, i8*)
declare i32 @llvm.coro.size.i32()
declare i8* @llvm.coro.begin(token, i8*)
declare token @llvm.coro.save(i8*)
declare i8 @llvm.coro.suspend(token, i1)
declare i8* @llvm.coro.free(token, i8*)
declare i1 @llvm.coro.end(i8*, i1)
; CHECK-LABEL: @main
define i32 @main() {
entry:
%hdl = call i8* @f(i32 4)
br label %while
while:
call void @llvm.coro.resume(i8* %hdl)
%done = call i1 @llvm.coro.done(i8* %hdl)
br i1 %done, label %end, label %while
end:
call void @llvm.coro.destroy(i8* %hdl)
ret i32 0
; CHECK: call void @print(i32 4)
; CHECK: call void @print(i32 3)
; CHECK: call void @print(i32 2)
; CHECK: call void @print(i32 1)
; CHECK: ret i32 0
}
declare i1 @llvm.coro.done(i8*)
declare void @llvm.coro.resume(i8*)
declare void @llvm.coro.destroy(i8*)
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