llvm-project

1
; RUN: opt %loadNPMPolly -aa-pipeline=basic-aa '-passes=print<polly-detect>' -disable-output < %s 2>&1 | FileCheck %s -check-prefix=PHI
2

3
; void f(long A[], long N, long *init_ptr) {
4
;   long i, j;
5
;   long i_non_canonical;
6
;
7
;   for (i = 0; i < N; ++i) {
8
;     init = *init_ptr;
9
;     i_non_canonical = init;
10
;     for (i = 0; i < N; ++i) {
11
;       A[i] = i_non_canonical;
12
;       i_non_canonical += 1;
13
;     }
14
;   }
15
; }
16

17
target 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"
18

19
define void @f(ptr noalias %A, i64 %N, ptr noalias %init_ptr) nounwind {
20
entry:
21
  br label %for.i
22

23
for.i:
24
  %indvar.i = phi i64 [ 0, %entry ], [ %indvar.i.next, %for.i.end ]
25
  %indvar.i.next = add nsw i64 %indvar.i, 1
26
  br label %entry.next
27

28
entry.next:
29
  %init = load i64, ptr %init_ptr
30
  br label %for.j
31

32
for.j:
33
  %indvar.j = phi i64 [ 0, %entry.next ], [ %indvar.j.next, %for.j ]
34
  %indvar.j.non_canonical = phi i64 [ %init, %entry.next ], [ %indvar.j.non_canonical.next, %for.j ]
35
  %scevgep = getelementptr i64, ptr %A, i64 %indvar.j
36
  store i64 %indvar.j.non_canonical, ptr %scevgep
37
  %indvar.j.next = add nsw i64 %indvar.j, 1
38
  %indvar.j.non_canonical.next = add nsw i64 %indvar.j.non_canonical, 1
39
  %exitcond.j = icmp eq i64 %indvar.j.next, %N
40
  br i1 %exitcond.j, label %for.i.end, label %for.j
41

42
for.i.end:
43
  %exitcond.i = icmp eq i64 %indvar.i.next, %N
44
  br i1 %exitcond.i, label %return, label %for.i
45

46
return:
47
  ret void
48
}
49

50
; PHI: Valid Region for Scop: for.i => return
51