source: icGREP/icgrep-devel/llvm-3.8.0.src/test/Analysis/LoopAccessAnalysis/resort-to-memchecks-only.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

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Line 
1; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
2
3; We give up analyzing the dependences in this loop due to non-constant
4; distance between A[i+offset] and A[i] and add memchecks to prove
5; independence.  Make sure that no dependences are reported in
6; this case.
7;
8;   for (i = 0; i < n; i++)
9;    A[i + offset] = A[i] * B[i] * C[i];
10
11target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
12target triple = "x86_64-apple-macosx10.10.0"
13
14; CHECK: Memory dependences are safe with run-time checks
15; CHECK-NEXT: Dependences:
16; CHECK-NEXT: Run-time memory checks:
17; CHECK-NEXT: 0:
18; CHECK-NEXT: Comparing group
19; CHECK-NEXT:   %arrayidxA2 = getelementptr inbounds i16, i16* %a, i64 %idx
20; CHECK-NEXT: Against group
21; CHECK-NEXT:   %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %indvar
22
23@B = common global i16* null, align 8
24@A = common global i16* null, align 8
25@C = common global i16* null, align 8
26
27define void @f(i64 %offset) {
28entry:
29  %a = load i16*, i16** @A, align 8
30  %b = load i16*, i16** @B, align 8
31  %c = load i16*, i16** @C, align 8
32  br label %for.body
33
34for.body:                                         ; preds = %for.body, %entry
35  %indvar = phi i64 [ 0, %entry ], [ %add, %for.body ]
36
37  %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %indvar
38  %loadA = load i16, i16* %arrayidxA, align 2
39
40  %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %indvar
41  %loadB = load i16, i16* %arrayidxB, align 2
42
43  %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %indvar
44  %loadC = load i16, i16* %arrayidxC, align 2
45
46  %mul = mul i16 %loadB, %loadA
47  %mul1 = mul i16 %mul, %loadC
48
49  %idx = add i64 %indvar, %offset
50  %arrayidxA2 = getelementptr inbounds i16, i16* %a, i64 %idx
51  store i16 %mul1, i16* %arrayidxA2, align 2
52
53  %add = add nuw nsw i64 %indvar, 1
54  %exitcond = icmp eq i64 %add, 20
55  br i1 %exitcond, label %for.end, label %for.body
56
57for.end:                                          ; preds = %for.body
58  ret void
59}
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