1; RUN: opt -S -loop-vectorize -force-vector-interleave=1 -force-vector-width=2 < %s | FileCheck %s
2
3; CHECK-LABEL: @postinc
4; CHECK-LABEL: scalar.ph:
5; CHECK: %bc.resume.val = phi i32 [ %n.vec, %middle.block ], [ 0, %entry ]
6; CHECK-LABEL: for.end:
7; CHECK: %[[RET:.*]] = phi i32 [ {{.*}}, %for.body ], [ %n.vec, %middle.block ]
8; CHECK: ret i32 %[[RET]]
9define i32 @postinc(i32 %k)  {
10entry:
11  br label %for.body
12
13for.body:
14  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
15  %inc = add nsw i32 %inc.phi, 1
16  %cmp = icmp eq i32 %inc, %k
17  br i1 %cmp, label %for.end, label %for.body
18
19for.end:
20  ret i32 %inc
21}
22
23; CHECK-LABEL: @preinc
24; CHECK-LABEL: middle.block:
25; CHECK: %[[v3:.+]] = sub i32 %n.vec, 1
26; CHECK: %ind.escape = add i32 0, %[[v3]]
27; CHECK-LABEL: scalar.ph:
28; CHECK: %bc.resume.val = phi i32 [ %n.vec, %middle.block ], [ 0, %entry ]
29; CHECK-LABEL: for.end:
30; CHECK: %[[RET:.*]] = phi i32 [ {{.*}}, %for.body ], [ %ind.escape, %middle.block ]
31; CHECK: ret i32 %[[RET]]
32define i32 @preinc(i32 %k)  {
33entry:
34  br label %for.body
35
36for.body:
37  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
38  %inc = add nsw i32 %inc.phi, 1
39  %cmp = icmp eq i32 %inc, %k
40  br i1 %cmp, label %for.end, label %for.body
41
42for.end:
43  ret i32 %inc.phi
44}
45
46; CHECK-LABEL: @constpre
47; CHECK-LABEL: for.end:
48; CHECK: %[[RET:.*]] = phi i32 [ {{.*}}, %for.body ], [ 2, %middle.block ]
49; CHECK: ret i32 %[[RET]]
50define i32 @constpre()  {
51entry:
52  br label %for.body
53
54for.body:
55  %inc.phi = phi i32 [ 32, %entry ], [ %inc, %for.body ]
56  %inc = sub nsw i32 %inc.phi, 2
57  %cmp = icmp eq i32 %inc, 0
58  br i1 %cmp, label %for.end, label %for.body
59
60for.end:
61  ret i32 %inc.phi
62}
63
64; CHECK-LABEL: @geppre
65; CHECK-LABEL: middle.block:
66; CHECK: %ind.escape = getelementptr i32, i32* %ptr, i64 124
67; CHECK-LABEL: for.end:
68; CHECK: %[[RET:.*]] = phi i32* [ {{.*}}, %for.body ], [ %ind.escape, %middle.block ]
69; CHECK: ret i32* %[[RET]]
70define i32* @geppre(i32* %ptr) {
71entry:
72  br label %for.body
73
74for.body:
75  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
76  %ptr.phi = phi i32* [ %ptr, %entry ], [ %inc.ptr, %for.body ]
77  %inc = add nsw i32 %inc.phi, 1
78  %inc.ptr = getelementptr i32, i32* %ptr.phi, i32 4
79  %cmp = icmp eq i32 %inc, 32
80  br i1 %cmp, label %for.end, label %for.body
81
82for.end:
83  ret i32* %ptr.phi
84}
85
86; CHECK-LABEL: @both
87; CHECK-LABEL: middle.block:
88; CHECK: %[[END:.*]] = sub i64 %n.vec, 1
89; CHECK: %ind.escape = getelementptr i32, i32* %base, i64 %[[END]]
90; CHECK-LABEL: for.end:
91; CHECK: %[[RET:.*]] = phi i32* [ %inc.lag1, %for.body ], [ %ind.escape, %middle.block ]
92; CHECK: ret i32* %[[RET]]
93
94define i32* @both(i32 %k)  {
95entry:
96  %base = getelementptr inbounds i32, i32* undef, i64 1
97  br label %for.body
98
99for.body:
100  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
101  %inc.lag1 = phi i32* [ %base, %entry ], [ %tmp, %for.body]
102  %inc.lag2 = phi i32* [ undef, %entry ], [ %inc.lag1, %for.body]
103  %tmp = getelementptr inbounds i32, i32* %inc.lag1, i64 1
104  %inc = add nsw i32 %inc.phi, 1
105  %cmp = icmp eq i32 %inc, %k
106  br i1 %cmp, label %for.end, label %for.body
107
108for.end:
109  ret i32* %inc.lag1
110}
111
112; CHECK-LABEL: @multiphi
113; CHECK-LABEL: scalar.ph:
114; CHECK: %bc.resume.val = phi i32 [ %n.vec, %middle.block ], [ 0, %entry ]
115; CHECK-LABEL: for.end:
116; CHECK: %phi = phi i32 [ {{.*}}, %for.body ], [ %n.vec, %middle.block ]
117; CHECK: %phi2 = phi i32 [ {{.*}}, %for.body ], [ %n.vec, %middle.block ]
118; CHECK: store i32 %phi2, i32* %p
119; CHECK: ret i32 %phi
120define i32 @multiphi(i32 %k, i32* %p)  {
121entry:
122  br label %for.body
123
124for.body:
125  %inc.phi = phi i32 [ 0, %entry ], [ %inc, %for.body ]
126  %inc = add nsw i32 %inc.phi, 1
127  %cmp = icmp eq i32 %inc, %k
128  br i1 %cmp, label %for.end, label %for.body
129
130for.end:
131  %phi = phi i32 [ %inc, %for.body ]
132  %phi2 = phi i32 [ %inc, %for.body ]
133  store i32 %phi2, i32* %p
134  ret i32 %phi
135}
136