1; RUN: opt %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -S | FileCheck %s
2; RUN: opt %s -loop-vectorize -force-vector-interleave=2 -force-vector-width=4 -S | FileCheck %s -check-prefix=UNROLL
3
4target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
5
6@b = common global [1000 x i32] zeroinitializer, align 16
7@c = common global [1000 x i32] zeroinitializer, align 16
8@a = common global [1000 x i32] zeroinitializer, align 16
9
10; Generate min.iters.check to skip the vector loop and jump to scalar.ph directly when loop iteration number is less than VF * UF.
11; CHECK-LABEL: foo(
12; CHECK: %min.iters.check = icmp ult i64 %N, 4
13; CHECK: br i1 %min.iters.check, label %scalar.ph, label %vector.ph
14; UNROLL-LABEL: foo(
15; UNROLL: %min.iters.check = icmp ult i64 %N, 8
16; UNROLL: br i1 %min.iters.check, label %scalar.ph, label %vector.ph
17
18define void @foo(i64 %N) {
19entry:
20  %cmp.8 = icmp sgt i64 %N, 0
21  br i1 %cmp.8, label %for.body.preheader, label %for.end
22
23for.body.preheader:                               ; preds = %entry
24  br label %for.body
25
26for.body:                                         ; preds = %for.body, %for.body.preheader
27  %i.09 = phi i64 [ %inc, %for.body ], [ 0, %for.body.preheader ]
28  %arrayidx = getelementptr inbounds [1000 x i32], [1000 x i32]* @b, i64 0, i64 %i.09
29  %tmp = load i32, i32* %arrayidx, align 4
30  %arrayidx1 = getelementptr inbounds [1000 x i32], [1000 x i32]* @c, i64 0, i64 %i.09
31  %tmp1 = load i32, i32* %arrayidx1, align 4
32  %add = add nsw i32 %tmp1, %tmp
33  %arrayidx2 = getelementptr inbounds [1000 x i32], [1000 x i32]* @a, i64 0, i64 %i.09
34  store i32 %add, i32* %arrayidx2, align 4
35  %inc = add nuw nsw i64 %i.09, 1
36  %exitcond = icmp eq i64 %inc, %N
37  br i1 %exitcond, label %for.end.loopexit, label %for.body
38
39for.end.loopexit:                                 ; preds = %for.body
40  br label %for.end
41
42for.end:                                          ; preds = %for.end.loopexit, %entry
43  ret void
44}
45