1; RUN: opt < %s -gvn -enable-load-pre -S | not grep pre1
2; GVN load pre was hoisting the loads at %13 and %16 up to bb4.outer.
3; This is invalid as it bypasses the check for %m.0.ph==null in bb4.
4; ModuleID = 'mbuf.c'
5target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
6target triple = "i386-apple-darwin9.6"
7  %struct.mbuf = type { %struct.mbuf*, %struct.mbuf*, i32, i8*, i16, i16, i32 }
8
9define void @m_adj(%struct.mbuf* %mp, i32 %req_len) nounwind optsize {
10entry:
11  %0 = icmp eq %struct.mbuf* %mp, null    ; <i1> [#uses=1]
12  %1 = icmp slt i32 %req_len, 0   ; <i1> [#uses=1]
13  %or.cond = or i1 %1, %0   ; <i1> [#uses=1]
14  br i1 %or.cond, label %return, label %bb4.preheader
15
16bb4.preheader:    ; preds = %entry
17  br label %bb4.outer
18
19bb2:    ; preds = %bb1
20  %2 = sub i32 %len.0, %13   ; <i32> [#uses=1]
21  %3 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 2    ; <i32*> [#uses=1]
22  store i32 0, i32* %3, align 4
23  %4 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 0    ; <%struct.mbuf**> [#uses=1]
24  %5 = load %struct.mbuf*, %struct.mbuf** %4, align 4    ; <%struct.mbuf*> [#uses=1]
25  br label %bb4.outer
26
27bb4.outer:    ; preds = %bb4.preheader, %bb2
28  %m.0.ph = phi %struct.mbuf* [ %5, %bb2 ], [ %mp, %bb4.preheader ]   ; <%struct.mbuf*> [#uses=7]
29  %len.0.ph = phi i32 [ %2, %bb2 ], [ %req_len, %bb4.preheader ]    ; <i32> [#uses=1]
30  %6 = icmp ne %struct.mbuf* %m.0.ph, null    ; <i1> [#uses=1]
31  %7 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 2    ; <i32*> [#uses=1]
32  %8 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 2   ; <i32*> [#uses=1]
33  %9 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 3   ; <i8**> [#uses=1]
34  %10 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 3   ; <i8**> [#uses=1]
35  br label %bb4
36
37bb4:    ; preds = %bb4.outer, %bb3
38  %len.0 = phi i32 [ 0, %bb3 ], [ %len.0.ph, %bb4.outer ]   ; <i32> [#uses=6]
39  %11 = icmp sgt i32 %len.0, 0    ; <i1> [#uses=1]
40  %12 = and i1 %11, %6    ; <i1> [#uses=1]
41  br i1 %12, label %bb1, label %bb7
42
43bb1:    ; preds = %bb4
44  %13 = load i32, i32* %7, align 4    ; <i32> [#uses=3]
45  %14 = icmp sgt i32 %13, %len.0    ; <i1> [#uses=1]
46  br i1 %14, label %bb3, label %bb2
47
48bb3:    ; preds = %bb1
49  %15 = sub i32 %13, %len.0    ; <i32> [#uses=1]
50  store i32 %15, i32* %8, align 4
51  %16 = load i8*, i8** %9, align 4    ; <i8*> [#uses=1]
52  %17 = getelementptr i8, i8* %16, i32 %len.0   ; <i8*> [#uses=1]
53  store i8* %17, i8** %10, align 4
54  br label %bb4
55
56bb7:    ; preds = %bb4
57  %18 = getelementptr %struct.mbuf, %struct.mbuf* %mp, i32 0, i32 5   ; <i16*> [#uses=1]
58  %19 = load i16, i16* %18, align 2    ; <i16> [#uses=1]
59  %20 = zext i16 %19 to i32   ; <i32> [#uses=1]
60  %21 = and i32 %20, 2    ; <i32> [#uses=1]
61  %22 = icmp eq i32 %21, 0    ; <i1> [#uses=1]
62  br i1 %22, label %return, label %bb8
63
64bb8:    ; preds = %bb7
65  %23 = sub i32 %req_len, %len.0    ; <i32> [#uses=1]
66  %24 = getelementptr %struct.mbuf, %struct.mbuf* %mp, i32 0, i32 6   ; <i32*> [#uses=1]
67  store i32 %23, i32* %24, align 4
68  ret void
69
70return:   ; preds = %bb7, %entry
71  ret void
72}
73