1; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -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"
4target triple = "x86_64-unknown-linux-gnu"
5
6; The parallel loop has been invalidated by the new memory accesses introduced
7; by reg2mem (Loop::isParallel() starts to return false). Ensure the loop is
8; now non-vectorizable.
9
10;CHECK-NOT: <4 x i32>
11define void @parallel_loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
12entry:
13  %indvars.iv.next.reg2mem = alloca i64
14  %indvars.iv.reg2mem = alloca i64
15  %"reg2mem alloca point" = bitcast i32 0 to i32
16  store i64 0, i64* %indvars.iv.reg2mem
17  br label %for.body
18
19for.body:                                         ; preds = %for.body.for.body_crit_edge, %entry
20  %indvars.iv.reload = load i64, i64* %indvars.iv.reg2mem
21  %arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.reload
22  %0 = load i32, i32* %arrayidx, align 4, !llvm.access.group !4
23  %arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv.reload
24  %1 = load i32, i32* %arrayidx2, align 4, !llvm.access.group !4
25  %idxprom3 = sext i32 %1 to i64
26  %arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
27  store i32 %0, i32* %arrayidx4, align 4, !llvm.access.group !4
28  %indvars.iv.next = add i64 %indvars.iv.reload, 1
29  ; A new store without the parallel metadata here:
30  store i64 %indvars.iv.next, i64* %indvars.iv.next.reg2mem
31  %indvars.iv.next.reload1 = load i64, i64* %indvars.iv.next.reg2mem
32  %arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next.reload1
33  %2 = load i32, i32* %arrayidx6, align 4, !llvm.access.group !4
34  store i32 %2, i32* %arrayidx2, align 4, !llvm.access.group !4
35  %indvars.iv.next.reload = load i64, i64* %indvars.iv.next.reg2mem
36  %lftr.wideiv = trunc i64 %indvars.iv.next.reload to i32
37  %exitcond = icmp eq i32 %lftr.wideiv, 512
38  br i1 %exitcond, label %for.end, label %for.body.for.body_crit_edge, !llvm.loop !3
39
40for.body.for.body_crit_edge:                      ; preds = %for.body
41  %indvars.iv.next.reload2 = load i64, i64* %indvars.iv.next.reg2mem
42  store i64 %indvars.iv.next.reload2, i64* %indvars.iv.reg2mem
43  br label %for.body
44
45for.end:                                          ; preds = %for.body
46  ret void
47}
48
49!3 = !{!3, !{!"llvm.loop.parallel_accesses", !4}}
50!4 = distinct !{}
51