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' 5 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" 6 target triple = "i386-apple-darwin9.6" 7 %struct.mbuf = type { %struct.mbuf*, %struct.mbuf*, i32, i8*, i16, i16, i32 } 8 9 define void @m_adj(%struct.mbuf* %mp, i32 %req_len) nounwind optsize { 10 entry: 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 16 bb4.preheader: ; preds = %entry 17 br label %bb4.outer 18 19 bb2: ; 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 27 bb4.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 37 bb4: ; 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 43 bb1: ; 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 48 bb3: ; 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 56 bb7: ; 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 64 bb8: ; 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 70 return: ; preds = %bb7, %entry 71 ret void 72 } 73
