1; RUN: opt -simple-loop-unswitch -verify-loop-info -verify-dom-info -disable-output < %s 2; RUN: opt -simple-loop-unswitch -verify-loop-info -verify-dom-info -enable-mssa-loop-dependency=true -verify-memoryssa -disable-output < %s 3 4; Loop unswitch should be able to unswitch these loops and 5; preserve LCSSA and LoopSimplify forms. 6 7target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64" 8target triple = "armv6-apple-darwin9" 9 10@delim1 = external global i32 ; <i32*> [#uses=1] 11@delim2 = external global i32 ; <i32*> [#uses=1] 12 13define i32 @ineqn(i8* %s, i8* %p) nounwind readonly { 14entry: 15 %0 = load i32, i32* @delim1, align 4 ; <i32> [#uses=1] 16 %1 = load i32, i32* @delim2, align 4 ; <i32> [#uses=1] 17 br label %bb8.outer 18 19bb: ; preds = %bb8 20 %2 = icmp eq i8* %p_addr.0, %s ; <i1> [#uses=1] 21 br i1 %2, label %bb10, label %bb2 22 23bb2: ; preds = %bb 24 %3 = getelementptr inbounds i8, i8* %p_addr.0, i32 1 ; <i8*> [#uses=3] 25 switch i32 %ineq.0.ph, label %bb8.backedge [ 26 i32 0, label %bb3 27 i32 1, label %bb6 28 ] 29 30bb8.backedge: ; preds = %bb6, %bb5, %bb2 31 br label %bb8 32 33bb3: ; preds = %bb2 34 %4 = icmp eq i32 %8, %0 ; <i1> [#uses=1] 35 br i1 %4, label %bb8.outer.loopexit, label %bb5 36 37bb5: ; preds = %bb3 38 br i1 %6, label %bb6, label %bb8.backedge 39 40bb6: ; preds = %bb5, %bb2 41 %5 = icmp eq i32 %8, %1 ; <i1> [#uses=1] 42 br i1 %5, label %bb7, label %bb8.backedge 43 44bb7: ; preds = %bb6 45 %.lcssa1 = phi i8* [ %3, %bb6 ] ; <i8*> [#uses=1] 46 br label %bb8.outer.backedge 47 48bb8.outer.backedge: ; preds = %bb8.outer.loopexit, %bb7 49 %.lcssa2 = phi i8* [ %.lcssa1, %bb7 ], [ %.lcssa, %bb8.outer.loopexit ] ; <i8*> [#uses=1] 50 %ineq.0.ph.be = phi i32 [ 0, %bb7 ], [ 1, %bb8.outer.loopexit ] ; <i32> [#uses=1] 51 br label %bb8.outer 52 53bb8.outer.loopexit: ; preds = %bb3 54 %.lcssa = phi i8* [ %3, %bb3 ] ; <i8*> [#uses=1] 55 br label %bb8.outer.backedge 56 57bb8.outer: ; preds = %bb8.outer.backedge, %entry 58 %ineq.0.ph = phi i32 [ 0, %entry ], [ %ineq.0.ph.be, %bb8.outer.backedge ] ; <i32> [#uses=3] 59 %p_addr.0.ph = phi i8* [ %p, %entry ], [ %.lcssa2, %bb8.outer.backedge ] ; <i8*> [#uses=1] 60 %6 = icmp eq i32 %ineq.0.ph, 1 ; <i1> [#uses=1] 61 br label %bb8 62 63bb8: ; preds = %bb8.outer, %bb8.backedge 64 %p_addr.0 = phi i8* [ %p_addr.0.ph, %bb8.outer ], [ %3, %bb8.backedge ] ; <i8*> [#uses=3] 65 %7 = load i8, i8* %p_addr.0, align 1 ; <i8> [#uses=2] 66 %8 = sext i8 %7 to i32 ; <i32> [#uses=2] 67 %9 = icmp eq i8 %7, 0 ; <i1> [#uses=1] 68 br i1 %9, label %bb10, label %bb 69 70bb10: ; preds = %bb8, %bb 71 %.0 = phi i32 [ %ineq.0.ph, %bb ], [ 0, %bb8 ] ; <i32> [#uses=1] 72 ret i32 %.0 73} 74 75; This is a simplified form of ineqn from above. It triggers some 76; different cases in the loop-unswitch code. 77 78define void @simplified_ineqn() nounwind readonly { 79entry: 80 br label %bb8.outer 81 82bb8.outer: ; preds = %bb6, %bb2, %entry 83 %x = phi i32 [ 0, %entry ], [ 0, %bb6 ], [ 1, %bb2 ] ; <i32> [#uses=1] 84 br i1 undef, label %return, label %bb2 85 86bb2: ; preds = %bb 87 switch i32 %x, label %bb6 [ 88 i32 0, label %bb8.outer 89 ] 90 91bb6: ; preds = %bb2 92 br i1 undef, label %bb8.outer, label %bb2 93 94return: ; preds = %bb8, %bb 95 ret void 96} 97 98; This function requires special handling to preserve LCSSA form. 99; PR4934 100 101define void @pnp_check_irq() nounwind noredzone { 102entry: 103 %conv56 = trunc i64 undef to i32 ; <i32> [#uses=1] 104 br label %while.cond.i 105 106while.cond.i: ; preds = %while.cond.i.backedge, %entry 107 %call.i25 = call i8* @pci_get_device() nounwind noredzone ; <i8*> [#uses=2] 108 br i1 undef, label %if.then65, label %while.body.i 109 110while.body.i: ; preds = %while.cond.i 111 br i1 undef, label %if.then31.i.i, label %while.cond.i.backedge 112 113while.cond.i.backedge: ; preds = %if.then31.i.i, %while.body.i 114 br label %while.cond.i 115 116if.then31.i.i: ; preds = %while.body.i 117 switch i32 %conv56, label %while.cond.i.backedge [ 118 i32 14, label %if.then42.i.i 119 i32 15, label %if.then42.i.i 120 ] 121 122if.then42.i.i: ; preds = %if.then31.i.i, %if.then31.i.i 123 %call.i25.lcssa48 = phi i8* [ %call.i25, %if.then31.i.i ], [ %call.i25, %if.then31.i.i ] ; <i8*> [#uses=0] 124 unreachable 125 126if.then65: ; preds = %while.cond.i 127 unreachable 128} 129 130declare i8* @pci_get_device() noredzone 131