1; RUN: opt -basic-aa -loop-idiom < %s -S | FileCheck %s
2target 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"
3
4; CHECK: @.memset_pattern = private unnamed_addr constant [4 x i32] [i32 2, i32 2, i32 2, i32 2], align 16
5
6target triple = "x86_64-apple-darwin10.0.0"
7
8;void test(int *f, unsigned n) {
9;  for (unsigned i = 0; i < 2 * n; i += 2) {
10;    f[i] = 0;
11;    f[i+1] = 0;
12;  }
13;}
14define void @test(i32* %f, i32 %n) nounwind ssp {
15entry:
16  %mul = shl i32 %n, 1
17  %cmp1 = icmp eq i32 %mul, 0
18  br i1 %cmp1, label %for.end, label %for.body.preheader
19
20for.body.preheader:                               ; preds = %entry
21  %0 = zext i32 %mul to i64
22  br label %for.body
23
24for.body:                                         ; preds = %for.body.preheader, %for.body
25  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
26  %arrayidx = getelementptr inbounds i32, i32* %f, i64 %indvars.iv
27  store i32 0, i32* %arrayidx, align 4
28  %1 = or i64 %indvars.iv, 1
29  %arrayidx2 = getelementptr inbounds i32, i32* %f, i64 %1
30  store i32 0, i32* %arrayidx2, align 4
31  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
32  %cmp = icmp ult i64 %indvars.iv.next, %0
33  br i1 %cmp, label %for.body, label %for.end.loopexit
34
35for.end.loopexit:                                 ; preds = %for.body
36  br label %for.end
37
38for.end:                                          ; preds = %for.end.loopexit, %entry
39  ret void
40; CHECK-LABEL: @test(
41; CHECK: call void @llvm.memset
42; CHECK-NOT: store
43}
44
45;void test_pattern(int *f, unsigned n) {
46;  for (unsigned i = 0; i < 2 * n; i += 2) {
47;    f[i] = 2;
48;    f[i+1] = 2;
49;  }
50;}
51define void @test_pattern(i32* %f, i32 %n) nounwind ssp {
52entry:
53  %mul = shl i32 %n, 1
54  %cmp1 = icmp eq i32 %mul, 0
55  br i1 %cmp1, label %for.end, label %for.body.preheader
56
57for.body.preheader:                               ; preds = %entry
58  %0 = zext i32 %mul to i64
59  br label %for.body
60
61for.body:                                         ; preds = %for.body.preheader, %for.body
62  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
63  %arrayidx = getelementptr inbounds i32, i32* %f, i64 %indvars.iv
64  store i32 2, i32* %arrayidx, align 4
65  %1 = or i64 %indvars.iv, 1
66  %arrayidx2 = getelementptr inbounds i32, i32* %f, i64 %1
67  store i32 2, i32* %arrayidx2, align 4
68  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
69  %cmp = icmp ult i64 %indvars.iv.next, %0
70  br i1 %cmp, label %for.body, label %for.end.loopexit
71
72for.end.loopexit:                                 ; preds = %for.body
73  br label %for.end
74
75for.end:                                          ; preds = %for.end.loopexit, %entry
76  ret void
77; CHECK-LABEL: @test_pattern(
78; CHECK: call void @memset_pattern16
79; CHECK-NOT: store
80}
81