1; RUN: opt %loadPolly -polly-scops -analyze < %s | FileCheck %s
2;
3; The assumed context is tricky here as the equality test for the inner loop
4; allows an "unbounded" loop trip count. We assume that does not happen, thus
5; if N <= 1 the outer loop is not executed and we are done, if N >= 3 the
6; equality test in the inner exit condition will trigger at some point and,
7; finally, if N == 2 we would have an unbounded inner loop.
8;
9; CHECK:      Assumed Context:
10; CHECK-NEXT:   [N] -> {  :  }
11; CHECK:      Invalid Context:
12; CHECK-NEXT:   [N] -> {  : N = 2 }
13;
14;    int jd(int *restrict A, int x, int N) {
15;      for (int i = 1; i < N; i++)
16;        for (int j = 3; j < N; j++)
17;          x += A[i];
18;      return x;
19;    }
20;
21target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
22
23define i32 @jd(i32* noalias %A, i32 %x, i32 %N) {
24entry:
25  %tmp = sext i32 %N to i64
26  br label %for.cond
27
28for.cond:                                         ; preds = %for.inc4, %entry
29  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc4 ], [ 1, %entry ]
30  %x.addr.0 = phi i32 [ %x, %entry ], [ %x.addr.1.lcssa, %for.inc4 ]
31  %cmp = icmp slt i64 %indvars.iv, %tmp
32  br i1 %cmp, label %for.body, label %for.end6
33
34for.body:                                         ; preds = %for.cond
35  br label %for.cond1
36
37for.cond1:                                        ; preds = %for.inc, %for.body
38  %x.addr.1 = phi i32 [ %x.addr.0, %for.body ], [ %add, %for.inc ]
39  %j.0 = phi i32 [ 3, %for.body ], [ %inc, %for.inc ]
40  %exitcond = icmp ne i32 %j.0, %N
41  br i1 %exitcond, label %for.body3, label %for.end
42
43for.body3:                                        ; preds = %for.cond1
44  br label %for.inc
45
46for.inc:                                          ; preds = %for.body3
47  %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
48  %tmp1 = load i32, i32* %arrayidx, align 4
49  %add = add nsw i32 %x.addr.1, %tmp1
50  %inc = add i32 %j.0, 1
51  br label %for.cond1
52
53for.end:                                          ; preds = %for.cond1
54  %x.addr.1.lcssa = phi i32 [ %x.addr.1, %for.cond1 ]
55  br label %for.inc4
56
57for.inc4:                                         ; preds = %for.end
58  %indvars.iv.next = add i64 %indvars.iv, 1
59  br label %for.cond
60
61for.end6:                                         ; preds = %for.cond
62  ret i32 %x.addr.0
63}
64