1; RUN: opt < %s  -loop-vectorize -force-vector-width=4 -dce -instcombine -S | FileCheck %s
2
3target 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-S128"
4
5@a = common global [2048 x i32] zeroinitializer, align 16
6
7; This is the loop.
8;  for (i=0; i<n; i++){
9;    a[i] += i;
10;  }
11;CHECK-LABEL: @inc(
12;CHECK: load <4 x i32>
13;CHECK: load <4 x i32>
14;CHECK: add nsw <4 x i32>
15;CHECK: add nsw <4 x i32>
16;CHECK: store <4 x i32>
17;CHECK: store <4 x i32>
18;CHECK: ret void
19define void @inc(i32 %n) nounwind uwtable noinline ssp {
20  %1 = icmp sgt i32 %n, 0
21  br i1 %1, label %.lr.ph, label %._crit_edge
22
23.lr.ph:                                           ; preds = %0, %.lr.ph
24  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
25  %2 = getelementptr inbounds [2048 x i32], [2048 x i32]* @a, i64 0, i64 %indvars.iv
26  %3 = load i32, i32* %2, align 4
27  %4 = trunc i64 %indvars.iv to i32
28  %5 = add nsw i32 %3, %4
29  store i32 %5, i32* %2, align 4
30  %indvars.iv.next = add i64 %indvars.iv, 1
31  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
32  %exitcond = icmp eq i32 %lftr.wideiv, %n
33  br i1 %exitcond, label %._crit_edge, label %.lr.ph, !llvm.loop !0
34
35._crit_edge:                                      ; preds = %.lr.ph, %0
36  ret void
37}
38
39!0 = !{!0, !1}
40!1 = !{!"llvm.loop.interleave.count", i32 2}
41