1 files changed, 72 insertions, 0 deletions
diff --git a/test/Transforms/GVN/2009-06-17-InvalidPRE.ll b/test/Transforms/GVN/2009-06-17-InvalidPRE.ll
new file mode 100644
index 0000000000000..c8982c86cb9e8
--- /dev/null
+++ b/test/Transforms/GVN/2009-06-17-InvalidPRE.ll
@@ -0,0 +1,72 @@
+; RUN: llvm-as < %s | opt -gvn -enable-load-pre | llvm-dis | not grep pre1
+; GVN load pre was hoisting the loads at %13 and %16 up to bb4.outer.  
+; This is invalid as it bypasses the check for %m.0.ph==null in bb4. 
+; ModuleID = 'mbuf.c'
+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"
+target triple = "i386-apple-darwin9.6"
+  %struct.mbuf = type { %struct.mbuf*, %struct.mbuf*, i32, i8*, i16, i16, i32 }
+
+define void @m_adj(%struct.mbuf* %mp, i32 %req_len) nounwind optsize {
+entry:
+  %0 = icmp eq %struct.mbuf* %mp, null    ; <i1> [#uses=1]
+  %1 = icmp slt i32 %req_len, 0   ; <i1> [#uses=1]
+  %or.cond = or i1 %1, %0   ; <i1> [#uses=1]
+  br i1 %or.cond, label %return, label %bb4.preheader
+
+bb4.preheader:    ; preds = %entry
+  br label %bb4.outer
+
+bb2:    ; preds = %bb1
+  %2 = sub i32 %len.0, %13   ; <i32> [#uses=1]
+  %3 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 2    ; <i32*> [#uses=1]
+  store i32 0, i32* %3, align 4
+  %4 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 0    ; <%struct.mbuf**> [#uses=1]
+  %5 = load %struct.mbuf** %4, align 4    ; <%struct.mbuf*> [#uses=1]
+  br label %bb4.outer
+
+bb4.outer:    ; preds = %bb4.preheader, %bb2
+  %m.0.ph = phi %struct.mbuf* [ %5, %bb2 ], [ %mp, %bb4.preheader ]   ; <%struct.mbuf*> [#uses=7]
+  %len.0.ph = phi i32 [ %2, %bb2 ], [ %req_len, %bb4.preheader ]    ; <i32> [#uses=1]
+  %6 = icmp ne %struct.mbuf* %m.0.ph, null    ; <i1> [#uses=1]
+  %7 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 2    ; <i32*> [#uses=1]
+  %8 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 2   ; <i32*> [#uses=1]
+  %9 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 3   ; <i8**> [#uses=1]
+  %10 = getelementptr %struct.mbuf* %m.0.ph, i32 0, i32 3   ; <i8**> [#uses=1]
+  br label %bb4
+
+bb4:    ; preds = %bb4.outer, %bb3
+  %len.0 = phi i32 [ 0, %bb3 ], [ %len.0.ph, %bb4.outer ]   ; <i32> [#uses=6]
+  %11 = icmp sgt i32 %len.0, 0    ; <i1> [#uses=1]
+  %12 = and i1 %11, %6    ; <i1> [#uses=1]
+  br i1 %12, label %bb1, label %bb7
+
+bb1:    ; preds = %bb4
+  %13 = load i32* %7, align 4    ; <i32> [#uses=3]
+  %14 = icmp sgt i32 %13, %len.0    ; <i1> [#uses=1]
+  br i1 %14, label %bb3, label %bb2
+
+bb3:    ; preds = %bb1
+  %15 = sub i32 %13, %len.0    ; <i32> [#uses=1]
+  store i32 %15, i32* %8, align 4
+  %16 = load i8** %9, align 4    ; <i8*> [#uses=1]
+  %17 = getelementptr i8* %16, i32 %len.0   ; <i8*> [#uses=1]
+  store i8* %17, i8** %10, align 4
+  br label %bb4
+
+bb7:    ; preds = %bb4
+  %18 = getelementptr %struct.mbuf* %mp, i32 0, i32 5   ; <i16*> [#uses=1]
+  %19 = load i16* %18, align 2    ; <i16> [#uses=1]
+  %20 = zext i16 %19 to i32   ; <i32> [#uses=1]
+  %21 = and i32 %20, 2    ; <i32> [#uses=1]
+  %22 = icmp eq i32 %21, 0    ; <i1> [#uses=1]
+  br i1 %22, label %return, label %bb8
+
+bb8:    ; preds = %bb7
+  %23 = sub i32 %req_len, %len.0    ; <i32> [#uses=1]
+  %24 = getelementptr %struct.mbuf* %mp, i32 0, i32 6   ; <i32*> [#uses=1]
+  store i32 %23, i32* %24, align 4
+  ret void
+
+return:   ; preds = %bb7, %entry
+  ret void
+}