1; RUN: opt -loop-distribute -verify-loop-info -verify-dom-info -S < %s \
2; RUN:   | FileCheck %s
3
4; Check that definitions used outside the loop are handled correctly: (1) they
5; are not dropped (2) when version the loop, a phi is added to merge the value
6; from the non-distributed loop and the distributed loop.
7;
8;   for (i = 0; i < n; i++) {
9;     A[i + 1] = A[i] * B[i];
10;   ==========================
11;     sum += C[i];
12;   }
13
14target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
15target triple = "x86_64-apple-macosx10.10.0"
16
17@B = common global i32* null, align 8
18@A = common global i32* null, align 8
19@C = common global i32* null, align 8
20@D = common global i32* null, align 8
21@E = common global i32* null, align 8
22@SUM = common global i32 0, align 8
23
24define void @f() {
25entry:
26  %a = load i32*, i32** @A, align 8
27  %b = load i32*, i32** @B, align 8
28  %c = load i32*, i32** @C, align 8
29  %d = load i32*, i32** @D, align 8
30  %e = load i32*, i32** @E, align 8
31
32  br label %for.body
33
34; CHECK: for.body.ldist1:
35; CHECK:   %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1
36; CHECK: for.body.ph:
37; CHECK: for.body:
38; CHECK:   %sum_add = add nuw nsw i32 %sum, %loadC
39; CHECK: for.end:
40; CHECK:   %sum_add.lver = phi i32 [ %sum_add, %for.body ], [ %sum_add.lver.orig, %for.body.lver.orig ]
41
42for.body:                                         ; preds = %for.body, %entry
43  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
44  %sum = phi i32 [ 0, %entry ], [ %sum_add, %for.body ]
45
46  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
47  %loadA = load i32, i32* %arrayidxA, align 4
48
49  %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
50  %loadB = load i32, i32* %arrayidxB, align 4
51
52  %mulA = mul i32 %loadB, %loadA
53
54  %add = add nuw nsw i64 %ind, 1
55  %arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add
56  store i32 %mulA, i32* %arrayidxA_plus_4, align 4
57
58  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
59  %loadC = load i32, i32* %arrayidxC, align 4
60
61  %sum_add = add nuw nsw i32 %sum, %loadC
62
63  %exitcond = icmp eq i64 %add, 20
64  br i1 %exitcond, label %for.end, label %for.body
65
66for.end:                                          ; preds = %for.body
67  store i32 %sum_add, i32* @SUM, align 4
68  ret void
69}
70