1 ; RUN: opt < %s -gvn -enable-load-pre -S | FileCheck %s
3 ; GVN load pre was hoisting the loads at %13 and %16 up to bb4.outer.
4 ; This is invalid as it bypasses the check for %m.0.ph==null in bb4.
6 target 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"
7 target triple = "i386-apple-darwin9.6"
8 %struct.mbuf = type { %struct.mbuf*, %struct.mbuf*, i32, i8*, i16, i16, i32 }
10 define void @m_adj(%struct.mbuf* %mp, i32 %req_len) nounwind optsize {
12 %0 = icmp eq %struct.mbuf* %mp, null ; <i1> [#uses=1]
13 %1 = icmp slt i32 %req_len, 0 ; <i1> [#uses=1]
14 %or.cond = or i1 %1, %0 ; <i1> [#uses=1]
15 br i1 %or.cond, label %return, label %bb4.preheader
17 bb4.preheader: ; preds = %entry
21 %2 = sub i32 %len.0, %13 ; <i32> [#uses=1]
22 %3 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 2 ; <i32*> [#uses=1]
23 store i32 0, i32* %3, align 4
24 %4 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 0 ; <%struct.mbuf**> [#uses=1]
25 %5 = load %struct.mbuf*, %struct.mbuf** %4, align 4 ; <%struct.mbuf*> [#uses=1]
28 bb4.outer: ; preds = %bb4.preheader, %bb2
29 %m.0.ph = phi %struct.mbuf* [ %5, %bb2 ], [ %mp, %bb4.preheader ] ; <%struct.mbuf*> [#uses=7]
30 %len.0.ph = phi i32 [ %2, %bb2 ], [ %req_len, %bb4.preheader ] ; <i32> [#uses=1]
31 %6 = icmp ne %struct.mbuf* %m.0.ph, null ; <i1> [#uses=1]
32 %7 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 2 ; <i32*> [#uses=1]
33 %8 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 2 ; <i32*> [#uses=1]
34 %9 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 3 ; <i8**> [#uses=1]
35 %10 = getelementptr %struct.mbuf, %struct.mbuf* %m.0.ph, i32 0, i32 3 ; <i8**> [#uses=1]
38 bb4: ; preds = %bb4.outer, %bb3
39 %len.0 = phi i32 [ 0, %bb3 ], [ %len.0.ph, %bb4.outer ] ; <i32> [#uses=6]
40 %11 = icmp sgt i32 %len.0, 0 ; <i1> [#uses=1]
41 %12 = and i1 %11, %6 ; <i1> [#uses=1]
42 br i1 %12, label %bb1, label %bb7
45 %13 = load i32, i32* %7, align 4 ; <i32> [#uses=3]
46 %14 = icmp sgt i32 %13, %len.0 ; <i1> [#uses=1]
47 br i1 %14, label %bb3, label %bb2
50 %15 = sub i32 %13, %len.0 ; <i32> [#uses=1]
51 store i32 %15, i32* %8, align 4
52 %16 = load i8*, i8** %9, align 4 ; <i8*> [#uses=1]
53 %17 = getelementptr i8, i8* %16, i32 %len.0 ; <i8*> [#uses=1]
54 store i8* %17, i8** %10, align 4
58 %18 = getelementptr %struct.mbuf, %struct.mbuf* %mp, i32 0, i32 5 ; <i16*> [#uses=1]
59 %19 = load i16, i16* %18, align 2 ; <i16> [#uses=1]
60 %20 = zext i16 %19 to i32 ; <i32> [#uses=1]
61 %21 = and i32 %20, 2 ; <i32> [#uses=1]
62 %22 = icmp eq i32 %21, 0 ; <i1> [#uses=1]
63 br i1 %22, label %return, label %bb8
66 %23 = sub i32 %req_len, %len.0 ; <i32> [#uses=1]
67 %24 = getelementptr %struct.mbuf, %struct.mbuf* %mp, i32 0, i32 6 ; <i32*> [#uses=1]
68 store i32 %23, i32* %24, align 4
71 return: ; preds = %bb7, %entry