1; REQUIRES: asserts
2; RUN: opt < %s  -passes='loop-vectorize' -force-vector-width=2 -enable-epilogue-vectorization -epilogue-vectorization-force-VF=2 --debug-only=loop-vectorize -S 2>&1 | FileCheck %s
3
4target datalayout = "e-m:e-i64:64-n32:64-v256:256:256-v512:512:512"
5
6; Currently we cannot handle live-out variables that are recurrences.
7; CHECK: LV: Checking a loop in 'f2'
8; CHECK: LEV: Unable to vectorize epilogue because the loop is not a supported candidate.
9
10define signext i32 @f2(i8* noalias %A, i32 signext %n) {
11entry:
12  %cmp1 = icmp sgt i32 %n, 0
13  br i1 %cmp1, label %for.body.preheader, label %for.end
14
15for.body.preheader:                               ; preds = %entry
16  %wide.trip.count = zext i32 %n to i64
17  br label %for.body
18
19for.body:                                         ; preds = %for.body.preheader, %for.body
20  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
21  %arrayidx = getelementptr inbounds i8, i8* %A, i64 %indvars.iv
22  %0 = load i8, i8* %arrayidx, align 1
23  %add = add i8 %0, 1
24  %arrayidx3 = getelementptr inbounds i8, i8* %A, i64 %indvars.iv
25  store i8 %add, i8* %arrayidx3, align 1
26  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
27  %exitcond = icmp ne i64 %indvars.iv.next, %wide.trip.count
28  br i1 %exitcond, label %for.body, label %for.end.loopexit
29
30for.end.loopexit:                                 ; preds = %for.body
31  %inc.lcssa.wide = phi i64 [ %indvars.iv.next, %for.body ]
32  %1 = trunc i64 %inc.lcssa.wide to i32
33  br label %for.end
34
35for.end:                                          ; preds = %for.end.loopexit, %entry
36  %i.0.lcssa = phi i32 [ 0, %entry ], [ %1, %for.end.loopexit ]
37  ret i32 %i.0.lcssa
38}
39
40; Currently we cannot handle widended/truncated inductions.
41; CHECK: LV: Checking a loop in 'f3'
42; CHECK: LEV: Unable to vectorize epilogue because the loop is not a supported candidate.
43
44define void @f3(i8* noalias %A, i32 signext %n) {
45entry:
46  %cmp1 = icmp sgt i32 %n, 0
47  br i1 %cmp1, label %for.body.preheader, label %for.end
48
49for.body.preheader:                               ; preds = %entry
50  %wide.trip.count = zext i32 %n to i64
51  br label %for.body
52
53for.body:                                         ; preds = %for.body.preheader, %for.body
54  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
55  %0 = trunc i64 %indvars.iv to i32
56  %conv = trunc i32 %0 to i8
57  %arrayidx = getelementptr inbounds i8, i8* %A, i64 %indvars.iv
58  store i8 %conv, i8* %arrayidx, align 1
59  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
60  %exitcond = icmp ne i64 %indvars.iv.next, %wide.trip.count
61  br i1 %exitcond, label %for.body, label %for.end.loopexit
62
63for.end.loopexit:                                 ; preds = %for.body
64  br label %for.end
65
66for.end:                                          ; preds = %for.end.loopexit, %entry
67  ret void
68}
69