1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; First example from Doc/Coroutines.rst (two block loop) converted to retcon
; RUN: opt < %s -passes='default<O2>' -S | FileCheck %s
define {ptr, i32} @f(ptr %buffer, i32 %n) {
; CHECK-LABEL: @f(
; CHECK-NEXT: coro.return:
; CHECK-NEXT: store i32 [[N:%.*]], ptr [[BUFFER:%.*]], align 4
; CHECK-NEXT: [[TMP0:%.*]] = insertvalue { ptr, i32 } { ptr @f.resume.0, i32 poison }, i32 [[N]], 1
; CHECK-NEXT: ret { ptr, i32 } [[TMP0]]
;
entry:
%id = call token @llvm.coro.id.retcon(i32 8, i32 4, ptr %buffer, ptr @prototype, ptr @allocate, ptr @deallocate)
%hdl = call ptr @llvm.coro.begin(token %id, ptr null)
br label %loop
loop:
%n.val = phi i32 [ %n, %entry ], [ %inc, %resume ]
%unwind = call i8 (...) @llvm.coro.suspend.retcon.i8(i32 %n.val)
%unwind0 = icmp ne i8 %unwind, 0
br i1 %unwind0, label %cleanup, label %resume
resume:
%inc = add i32 %n.val, 1
br label %loop
cleanup:
call i1 @llvm.coro.end(ptr %hdl, i1 0, token none)
unreachable
}
define i32 @main() {
; CHECK-LABEL: @main(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @print(i32 4)
; CHECK-NEXT: call void @print(i32 5)
; CHECK-NEXT: call void @print(i32 6)
; CHECK-NEXT: ret i32 0
;
entry:
%0 = alloca [8 x i8], align 4
%prepare = call ptr @llvm.coro.prepare.retcon(ptr @f)
%result0 = call {ptr, i32} %prepare(ptr %0, i32 4)
%value0 = extractvalue {ptr, i32} %result0, 1
call void @print(i32 %value0)
%cont0 = extractvalue {ptr, i32} %result0, 0
%result1 = call {ptr, i32} %cont0(ptr %0, i8 zeroext 0)
%value1 = extractvalue {ptr, i32} %result1, 1
call void @print(i32 %value1)
%cont1 = extractvalue {ptr, i32} %result1, 0
%result2 = call {ptr, i32} %cont1(ptr %0, i8 zeroext 0)
%value2 = extractvalue {ptr, i32} %result2, 1
call void @print(i32 %value2)
%cont2 = extractvalue {ptr, i32} %result2, 0
call {ptr, i32} %cont2(ptr %0, i8 zeroext 1)
ret i32 0
}
; Unfortunately, we don't seem to fully optimize this right now due
; to some sort of phase-ordering thing.
declare token @llvm.coro.id.retcon(i32, i32, ptr, ptr, ptr, ptr)
declare ptr @llvm.coro.begin(token, ptr)
declare i8 @llvm.coro.suspend.retcon.i8(...)
declare i1 @llvm.coro.end(ptr, i1, token)
declare ptr @llvm.coro.prepare.retcon(ptr)
declare {ptr, i32} @prototype(ptr, i8 zeroext)
declare noalias ptr @allocate(i32 %size)
declare void @deallocate(ptr %ptr)
declare void @print(i32)
|
