1; RUN: opt < %s -gvn -enable-load-pre -S | FileCheck %s 2; CHECK-NOT: pre1 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. 5; ModuleID = 'mbuf.c' 6target 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" 7target triple = "i386-apple-darwin9.6" 8 %struct.mbuf = type { %struct.mbuf*, %struct.mbuf*, i32, i8*, i16, i16, i32 } 9 10define void @m_adj(%struct.mbuf* %mp, i32 %req_len) nounwind optsize { 11entry: 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 16 17bb4.preheader: ; preds = %entry 18 br label %bb4.outer 19 20bb2: ; preds = %bb1 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] 26 br label %bb4.outer 27 28bb4.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] 36 br label %bb4 37 38bb4: ; 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 43 44bb1: ; preds = %bb4 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 48 49bb3: ; preds = %bb1 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 55 br label %bb4 56 57bb7: ; preds = %bb4 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 64 65bb8: ; preds = %bb7 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 69 ret void 70 71return: ; preds = %bb7, %entry 72 ret void 73} 74