1; RUN: opt %loadPolly -polly-mse -analyze < %s | FileCheck %s
2; RUN: opt %loadPolly -polly-mse -pass-remarks-analysis="polly-mse" -analyze < %s 2>&1| FileCheck %s --check-prefix=MSE
3;
4; Verify that Polly detects problems and does not expand the array
5;
6; Original source code :
7;
8; #define Ni 2000
9; #define Nj 3000
10;
11; double mse(double A[Ni], double B[Nj]) {
12;   int i;
13;   double tmp = 6;
14;   for (i = 0; i < Ni; i++) {
15;     for (int j = 2; j<Nj; j++) {
16;       B[j-1] = j;
17;     }
18;     A[i] = B[i];
19;   }
20;   return tmp;
21; }
22;
23; Check that the pass detects the problem of read from original array after expansion.
24;
25; MSE: The expansion of MemRef_B would lead to a read from the original array.
26;
27; CHECK-NOT: double MemRef_B2_expanded[2000][3000]; // Element size 8
28;
29; Check that the  memory accesses are not modified
30;
31; CHECK-NOT: new: { Stmt_for_body3[i0, i1] -> MemRef_B_Stmt_for_body3_expanded[i0, i1] };
32; CHECK-NOT: new: { Stmt_for_end[i0] -> MemRef_B_Stmt_for_body3_expanded
33;
34target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
35target triple = "x86_64-unknown-linux-gnu"
36
37define double @mse(double* %A, double* %B) {
38entry:
39  br label %entry.split
40
41entry.split:                                      ; preds = %entry
42  br label %for.body
43
44for.body:                                         ; preds = %entry.split, %for.end
45  %indvars.iv4 = phi i64 [ 0, %entry.split ], [ %indvars.iv.next5, %for.end ]
46  br label %for.body3
47
48for.body3:                                        ; preds = %for.body, %for.body3
49  %indvars.iv = phi i64 [ 2, %for.body ], [ %indvars.iv.next, %for.body3 ]
50  %0 = trunc i64 %indvars.iv to i32
51  %conv = sitofp i32 %0 to double
52  %1 = add nsw i64 %indvars.iv, -1
53  %arrayidx = getelementptr inbounds double, double* %B, i64 %1
54  store double %conv, double* %arrayidx, align 8
55  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
56  %exitcond = icmp ne i64 %indvars.iv.next, 3000
57  br i1 %exitcond, label %for.body3, label %for.end
58
59for.end:                                          ; preds = %for.body3
60  %arrayidx5 = getelementptr inbounds double, double* %B, i64 %indvars.iv4
61  %2 = bitcast double* %arrayidx5 to i64*
62  %3 = load i64, i64* %2, align 8
63  %arrayidx7 = getelementptr inbounds double, double* %A, i64 %indvars.iv4
64  %4 = bitcast double* %arrayidx7 to i64*
65  store i64 %3, i64* %4, align 8
66  %indvars.iv.next5 = add nuw nsw i64 %indvars.iv4, 1
67  %exitcond6 = icmp ne i64 %indvars.iv.next5, 2000
68  br i1 %exitcond6, label %for.body, label %for.end10
69
70for.end10:                                        ; preds = %for.end
71  ret double 6.000000e+00
72}
73