1; The inliner should never inline recursive functions into other functions.
2; This effectively is just peeling off the first iteration of a loop, and the
3; inliner heuristics are not set up for this.
4
5; RUN: opt -inline %s -S | FileCheck %s
6
7target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
8target triple = "x86_64-apple-darwin10.3"
9
10@g = common global i32 0                          ; <i32*> [#uses=1]
11
12define internal void @foo(i32 %x) nounwind ssp {
13entry:
14  %0 = icmp slt i32 %x, 0                         ; <i1> [#uses=1]
15  br i1 %0, label %return, label %bb
16
17bb:                                               ; preds = %entry
18  %1 = sub nsw i32 %x, 1                          ; <i32> [#uses=1]
19  call void @foo(i32 %1) nounwind ssp
20  volatile store i32 1, i32* @g, align 4
21  ret void
22
23return:                                           ; preds = %entry
24  ret void
25}
26
27
28;; CHECK: @bonk
29;; CHECK: call void @foo(i32 42)
30define void @bonk() nounwind ssp {
31entry:
32  call void @foo(i32 42) nounwind ssp
33  ret void
34}
35
36
37
38;; Here is an indirect case that should not be infinitely inlined.
39
40define internal void @f1(i32 %x, i8* %Foo, i8* %Bar) nounwind ssp {
41entry:
42  %0 = bitcast i8* %Bar to void (i32, i8*, i8*)*
43  %1 = sub nsw i32 %x, 1
44  call void %0(i32 %1, i8* %Foo, i8* %Bar) nounwind
45  volatile store i32 42, i32* @g, align 4
46  ret void
47}
48
49define internal void @f2(i32 %x, i8* %Foo, i8* %Bar) nounwind ssp {
50entry:
51  %0 = icmp slt i32 %x, 0                         ; <i1> [#uses=1]
52  br i1 %0, label %return, label %bb
53
54bb:                                               ; preds = %entry
55  %1 = bitcast i8* %Foo to void (i32, i8*, i8*)*  ; <void (i32, i8*, i8*)*> [#uses=1]
56  call void %1(i32 %x, i8* %Foo, i8* %Bar) nounwind
57  volatile store i32 13, i32* @g, align 4
58  ret void
59
60return:                                           ; preds = %entry
61  ret void
62}
63
64
65; CHECK: @top_level
66; CHECK: call void @f2(i32 122
67; Here we inline one instance of the cycle, but we don't want to completely
68; unroll it.
69define void @top_level() nounwind ssp {
70entry:
71  call void @f2(i32 123, i8* bitcast (void (i32, i8*, i8*)* @f1 to i8*), i8* bitcast (void (i32, i8*, i8*)* @f2 to i8*)) nounwind ssp
72  ret void
73}
74