1; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
2
3target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
4
5; We shouldn't quit the analysis if we encounter a pointer without known
6; bounds *unless* we actually need to emit a memcheck for it.  (We only
7; compute bounds for SCEVAddRecs so A[i*i] is deemed not having known bounds.)
8;
9; for (i = 0; i < 20; ++i)
10;   A[i*i] *= 2;
11
12; CHECK: for.body:
13; CHECK:     Report: unsafe dependent memory operations in loop
14; CHECK-NOT: Report: cannot identify array bounds
15; CHECK:     Dependences:
16; CHECK:       Unknown:
17; CHECK:           %loadA = load i16, i16* %arrayidxA, align 2 ->
18; CHECK:           store i16 %mul, i16* %arrayidxA, align 2
19
20define void @f(i16* %a) {
21entry:
22  br label %for.body
23
24for.body:                                         ; preds = %for.body, %entry
25  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
26
27  %access_ind = mul i64 %ind, %ind
28
29  %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %access_ind
30  %loadA = load i16, i16* %arrayidxA, align 2
31
32  %mul = mul i16 %loadA, 2
33
34  store i16 %mul, i16* %arrayidxA, align 2
35
36  %add = add nuw nsw i64 %ind, 1
37  %exitcond = icmp eq i64 %add, 20
38  br i1 %exitcond, label %for.end, label %for.body
39
40for.end:                                          ; preds = %for.body
41  ret void
42}
43