1; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S | FileCheck %s
2
3; Test case for PR45525. Checks that phi's with a single predecessor and a mask are supported.
4
5define void @main(i1 %cond, i32* %arr) {
6; CHECK-LABEL: @main(
7; CHECK-NEXT:  bb.0:
8; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
9; CHECK:       vector.ph:
10; CHECK:         br label [[VECTOR_BODY:%.*]]
11; CHECK:       vector.body:
12; CHECK:         [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
13; CHECK:         [[TMP5:%.*]] = mul <4 x i32> [[VEC_IND]], <i32 3, i32 3, i32 3, i32 3>
14;
15bb.0:
16  br label %bb.1
17
18bb.1:                                             ; preds = %bb.3, %bb.0
19  %iv = phi i32 [ 0, %bb.0 ], [ %iv.next, %bb.3 ]
20  br i1 %cond, label %bb.3, label %bb.2
21
22bb.2:                                             ; preds = %bb.1
23  %single.pred = phi i32 [ %iv, %bb.1 ]
24  %mult = mul i32 %single.pred, 3
25  br label %bb.3
26
27bb.3:                                             ; preds = %bb.2, %bb.1
28  %stored.value = phi i32 [ 7, %bb.1 ], [ %mult, %bb.2 ]
29  %arrayidx = getelementptr inbounds i32, i32* %arr, i32 %iv
30  store i32 %stored.value, i32* %arrayidx
31  %iv.next = add i32 %iv, 1
32  %continue = icmp ult i32 %iv.next, 32
33  br i1 %continue, label %bb.1, label %bb.4
34
35bb.4:                                             ; preds = %bb.3
36  ret void
37}
38