1; RUN: opt -basic-aa -loop-idiom < %s -S | FileCheck %s
2target datalayout = "e-p:40:64:64:32-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"
3
4%struct.foo = type { i32, i32 }
5%struct.foo1 = type { i32, i32, i32 }
6%struct.foo2 = type { i32, i16, i16 }
7
8;void bar1(foo_t *f, unsigned n) {
9;  for (unsigned i = 0; i < n; ++i) {
10;    f[i].a = 0;
11;    f[i].b = 0;
12;  }
13;}
14define void @bar1(%struct.foo* %f, i32 %n) nounwind ssp {
15entry:
16  %cmp1 = icmp eq i32 %n, 0
17  br i1 %cmp1, label %for.end, label %for.body.preheader
18
19for.body.preheader:                               ; preds = %entry
20  br label %for.body
21
22for.body:                                         ; preds = %for.body.preheader, %for.body
23  %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
24  %a = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 0
25  store i32 0, i32* %a, align 4
26  %b = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 1
27  store i32 0, i32* %b, align 4
28  %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
29  %exitcond = icmp ne i32 %indvars.iv.next, %n
30  br i1 %exitcond, label %for.body, label %for.end.loopexit
31
32for.end.loopexit:                                 ; preds = %for.body
33  br label %for.end
34
35for.end:                                          ; preds = %for.end.loopexit, %entry
36  ret void
37; CHECK-LABEL: @bar1(
38; CHECK: call void @llvm.memset
39; CHECK-NOT: store
40}
41
42;void bar2(foo_t *f, unsigned n) {
43;  for (unsigned i = 0; i < n; ++i) {
44;    f[i].b = 0;
45;    f[i].a = 0;
46;  }
47;}
48define void @bar2(%struct.foo* %f, i32 %n) nounwind ssp {
49entry:
50  %cmp1 = icmp eq i32 %n, 0
51  br i1 %cmp1, label %for.end, label %for.body.preheader
52
53for.body.preheader:                               ; preds = %entry
54  br label %for.body
55
56for.body:                                         ; preds = %for.body.preheader, %for.body
57  %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
58  %b = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 1
59  store i32 0, i32* %b, align 4
60  %a = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 0
61  store i32 0, i32* %a, align 4
62  %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
63  %exitcond = icmp ne i32 %indvars.iv.next, %n
64  br i1 %exitcond, label %for.body, label %for.end.loopexit
65
66for.end.loopexit:                                 ; preds = %for.body
67  br label %for.end
68
69for.end:                                          ; preds = %for.end.loopexit, %entry
70  ret void
71; CHECK-LABEL: @bar2(
72; CHECK: call void @llvm.memset
73; CHECK-NOT: store
74}
75
76;void bar3(foo_t *f, unsigned n) {
77;  for (unsigned i = n; i > 0; --i) {
78;    f[i].a = 0;
79;    f[i].b = 0;
80;  }
81;}
82define void @bar3(%struct.foo* nocapture %f, i32 %n) nounwind ssp {
83entry:
84  %cmp1 = icmp eq i32 %n, 0
85  br i1 %cmp1, label %for.end, label %for.body.preheader
86
87for.body.preheader:                               ; preds = %entry
88  br label %for.body
89
90for.body:                                         ; preds = %for.body.preheader, %for.body
91  %indvars.iv = phi i32 [ %n, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
92  %a = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 0
93  store i32 0, i32* %a, align 4
94  %b = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 1
95  store i32 0, i32* %b, align 4
96  %dec = add i32 %indvars.iv, -1
97  %cmp = icmp eq i32 %dec, 0
98  %indvars.iv.next = add nsw i32 %indvars.iv, -1
99  br i1 %cmp, label %for.end.loopexit, label %for.body
100
101for.end.loopexit:                                 ; preds = %for.body
102  br label %for.end
103
104for.end:                                          ; preds = %for.end.loopexit, %entry
105  ret void
106; CHECK-LABEL: @bar3(
107; CHECK: call void @llvm.memset
108; CHECK-NOT: store
109}
110
111;void bar4(foo_t *f, unsigned n) {
112;  for (unsigned i = 0; i < n; ++i) {
113;    f[i].a = 0;
114;    f[i].b = 1;
115;  }
116;}
117define void @bar4(%struct.foo* nocapture %f, i32 %n) nounwind ssp {
118entry:
119  %cmp1 = icmp eq i32 %n, 0
120  br i1 %cmp1, label %for.end, label %for.body.preheader
121
122for.body.preheader:                               ; preds = %entry
123  br label %for.body
124
125for.body:                                         ; preds = %for.body.preheader, %for.body
126  %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
127  %a = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 0
128  store i32 0, i32* %a, align 4
129  %b = getelementptr inbounds %struct.foo, %struct.foo* %f, i32 %indvars.iv, i32 1
130  store i32 1, i32* %b, align 4
131  %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
132  %exitcond = icmp ne i32 %indvars.iv.next, %n
133  br i1 %exitcond, label %for.body, label %for.end.loopexit
134
135for.end.loopexit:                                 ; preds = %for.body
136  br label %for.end
137
138for.end:                                          ; preds = %for.end.loopexit, %entry
139  ret void
140; CHECK-LABEL: @bar4(
141; CHECK-NOT: call void @llvm.memset
142}
143
144;void bar5(foo1_t *f, unsigned n) {
145;  for (unsigned i = 0; i < n; ++i) {
146;    f[i].a = 0;
147;    f[i].b = 0;
148;  }
149;}
150define void @bar5(%struct.foo1* nocapture %f, i32 %n) nounwind ssp {
151entry:
152  %cmp1 = icmp eq i32 %n, 0
153  br i1 %cmp1, label %for.end, label %for.body.preheader
154
155for.body.preheader:                               ; preds = %entry
156  br label %for.body
157
158for.body:                                         ; preds = %for.body.preheader, %for.body
159  %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
160  %a = getelementptr inbounds %struct.foo1, %struct.foo1* %f, i32 %indvars.iv, i32 0
161  store i32 0, i32* %a, align 4
162  %b = getelementptr inbounds %struct.foo1, %struct.foo1* %f, i32 %indvars.iv, i32 1
163  store i32 0, i32* %b, align 4
164  %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
165  %exitcond = icmp ne i32 %indvars.iv.next, %n
166  br i1 %exitcond, label %for.body, label %for.end.loopexit
167
168for.end.loopexit:                                 ; preds = %for.body
169  br label %for.end
170
171for.end:                                          ; preds = %for.end.loopexit, %entry
172  ret void
173; CHECK-LABEL: @bar5(
174; CHECK-NOT: call void @llvm.memset
175}
176
177;void bar6(foo2_t *f, unsigned n) {
178;  for (unsigned i = 0; i < n; ++i) {
179;    f[i].a = 0;
180;    f[i].b = 0;
181;    f[i].c = 0;
182;  }
183;}
184define void @bar6(%struct.foo2* nocapture %f, i32 %n) nounwind ssp {
185entry:
186  %cmp1 = icmp eq i32 %n, 0
187  br i1 %cmp1, label %for.end, label %for.body.preheader
188
189for.body.preheader:                               ; preds = %entry
190  br label %for.body
191
192for.body:                                         ; preds = %for.body.preheader, %for.body
193  %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
194  %a = getelementptr inbounds %struct.foo2, %struct.foo2* %f, i32 %indvars.iv, i32 0
195  store i32 0, i32* %a, align 4
196  %b = getelementptr inbounds %struct.foo2, %struct.foo2* %f, i32 %indvars.iv, i32 1
197  store i16 0, i16* %b, align 4
198  %c = getelementptr inbounds %struct.foo2, %struct.foo2* %f, i32 %indvars.iv, i32 2
199  store i16 0, i16* %c, align 2
200  %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
201  %exitcond = icmp ne i32 %indvars.iv.next, %n
202  br i1 %exitcond, label %for.body, label %for.end.loopexit
203
204for.end.loopexit:                                 ; preds = %for.body
205  br label %for.end
206
207for.end:                                          ; preds = %for.end.loopexit, %entry
208  ret void
209; CHECK-LABEL: @bar6(
210; CHECK: call void @llvm.memset
211; CHECK-NOT: store
212}
213