1; RUN: opt -loop-reduce -S < %s | FileCheck %s 2; 3; <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce 4 5target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" 6target triple = "x86_64-apple-darwin10.0.0" 7 8; IVUsers should not consider tmp128 a valid user because it is not in a 9; simplified loop nest. 10; CHECK-LABEL: @nopreheader( 11; CHECK: for.cond: 12; CHECK: %tmp128 = add i64 %0, %indvar65 13define void @nopreheader(i8* %cmd) nounwind ssp { 14entry: 15 indirectbr i8* undef, [label %while.cond] 16 17while.cond: ; preds = %while.body, %entry 18 %0 = phi i64 [ %indvar.next48, %while.body ], [ 0, %entry ] 19 indirectbr i8* undef, [label %while.end, label %while.body] 20 21while.body: ; preds = %lor.rhs, %lor.lhs.false17, %lor.lhs.false11, %lor.lhs.false, %land.rhs 22 %indvar.next48 = add i64 %0, 1 23 indirectbr i8* undef, [label %while.cond] 24 25while.end: ; preds = %lor.rhs, %while.cond 26 indirectbr i8* undef, [label %if.end152] 27 28if.end152: ; preds = %lor.lhs.false144, %if.end110 29 indirectbr i8* undef, [label %lor.lhs.false184, label %for.cond] 30 31lor.lhs.false184: ; preds = %lor.lhs.false177 32 indirectbr i8* undef, [label %return, label %for.cond] 33 34for.cond: ; preds = %for.inc, %lor.lhs.false184, %if.end152 35 %indvar65 = phi i64 [ %indvar.next66, %for.inc ], [ 0, %lor.lhs.false184 ], [ 0, %if.end152 ] 36 %tmp128 = add i64 %0, %indvar65 37 %s.4 = getelementptr i8, i8* %cmd, i64 %tmp128 38 %tmp195 = load i8, i8* %s.4, align 1 39 indirectbr i8* undef, [label %return, label %land.rhs198] 40 41land.rhs198: ; preds = %for.cond 42 indirectbr i8* undef, [label %return, label %for.inc] 43 44for.inc: ; preds = %lor.rhs234, %land.lhs.true228, %land.lhs.true216, %land.lhs.true204 45 %indvar.next66 = add i64 %indvar65, 1 46 indirectbr i8* undef, [label %for.cond] 47 48return: ; preds = %if.end677, %doshell, %if.then96 49 ret void 50} 51 52; Another case with a dominating loop that does not contain the IV 53; User. Just make sure it doesn't assert. 54define void @nopreheader2() nounwind ssp { 55entry: 56 indirectbr i8* undef, [label %while.cond, label %return] 57 58while.cond: ; preds = %while.cond.backedge, %entry 59 indirectbr i8* undef, [label %while.cond.backedge, label %lor.rhs] 60 61lor.rhs: ; preds = %while.cond 62 indirectbr i8* undef, [label %while.cond.backedge, label %while.end] 63 64while.cond.backedge: ; preds = %lor.rhs, %while.cond 65 indirectbr i8* undef, [label %while.cond] 66 67while.end: ; preds = %lor.rhs 68 indirectbr i8* undef, [label %if.then18, label %return] 69 70if.then18: ; preds = %while.end 71 indirectbr i8* undef, [label %if.end35, label %lor.lhs.false] 72 73lor.lhs.false: ; preds = %if.then18 74 indirectbr i8* undef, [label %if.end35, label %return] 75 76if.end35: ; preds = %lor.lhs.false, %if.then18 77 indirectbr i8* undef, [label %while.cond36] 78 79while.cond36: ; preds = %while.body49, %if.end35 80 %0 = phi i64 [ %indvar.next13, %while.body49 ], [ 0, %if.end35 ] 81 indirectbr i8* undef, [label %while.body49, label %lor.rhs42] 82 83lor.rhs42: ; preds = %while.cond36 84 indirectbr i8* undef, [label %while.body49, label %while.end52] 85 86while.body49: ; preds = %lor.rhs42, %while.cond36 87 %indvar.next13 = add i64 %0, 1 88 indirectbr i8* undef, [label %while.cond36] 89 90while.end52: ; preds = %lor.rhs42 91 indirectbr i8* undef, [label %land.lhs.true, label %return] 92 93land.lhs.true: ; preds = %while.end52 94 indirectbr i8* undef, [label %while.cond66.preheader, label %return] 95 96while.cond66.preheader: ; preds = %land.lhs.true 97 indirectbr i8* undef, [label %while.cond66] 98 99while.cond66: ; preds = %while.body77, %while.cond66.preheader 100 indirectbr i8* undef, [label %land.rhs, label %while.cond81.preheader] 101 102land.rhs: ; preds = %while.cond66 103 indirectbr i8* undef, [label %while.body77, label %while.cond81.preheader] 104 105while.cond81.preheader: ; preds = %land.rhs, %while.cond66 106 %tmp45 = add i64 undef, %0 107 %tmp46 = add i64 %tmp45, undef 108 indirectbr i8* undef, [label %while.cond81] 109 110while.body77: ; preds = %land.rhs 111 indirectbr i8* undef, [label %while.cond66] 112 113while.cond81: ; preds = %while.body94, %while.cond81.preheader 114 %tmp25 = add i64 %tmp46, undef 115 indirectbr i8* undef, [label %while.body94, label %lor.rhs87] 116 117lor.rhs87: ; preds = %while.cond81 118 indirectbr i8* undef, [label %while.body94, label %return] 119 120while.body94: ; preds = %lor.rhs87, %while.cond81 121 indirectbr i8* undef, [label %while.cond81] 122 123return: ; preds = %if.end216, %land.lhs.true183, %land.lhs.true, %while.end52, %lor.lhs.false, %while.end, %entry 124 ret void 125} 126 127; Test a phi operand IV User dominated by a no-preheader loop. 128define void @nopreheader3() nounwind uwtable ssp align 2 { 129entry: 130 indirectbr i8* blockaddress(@nopreheader3, %if.end10), [label %if.end22, label %if.end10] 131 132if.end10: ; preds = %entry 133 indirectbr i8* blockaddress(@nopreheader3, %if.end6.i), [label %if.end22, label %if.end6.i] 134 135if.end6.i: ; preds = %if.end10 136 indirectbr i8* blockaddress(@nopreheader3, %while.cond2.preheader.i.i), [label %if.then12, label %while.cond2.preheader.i.i] 137 138while.cond2.preheader.i.i: ; preds = %while.end.i18.i, %if.end6.i 139 indirectbr i8* blockaddress(@nopreheader3, %while.cond2.i.i), [label %while.cond2.i.i] 140 141while.cond2.i.i: ; preds = %while.cond2.i.i, %while.cond2.preheader.i.i 142 %i1.1.i14.i = phi i32 [ %add.i15.i, %while.cond2.i.i ], [ undef, %while.cond2.preheader.i.i ] 143 %add.i15.i = add nsw i32 %i1.1.i14.i, undef 144 indirectbr i8* blockaddress(@nopreheader3, %while.end.i18.i), [label %while.cond2.i.i, label %while.end.i18.i] 145 146while.end.i18.i: ; preds = %while.cond2.i.i 147 indirectbr i8* blockaddress(@nopreheader3, %while.cond2.preheader.i.i), [label %if.then12, label %while.cond2.preheader.i.i] 148 149if.then12: ; preds = %while.end.i18.i, %if.end6.i 150 %i1.0.lcssa.i.i = phi i32 [ undef, %if.end6.i ], [ %i1.1.i14.i, %while.end.i18.i ] 151 indirectbr i8* blockaddress(@nopreheader3, %if.end22), [label %if.end22] 152 153if.end22: ; preds = %if.then12, %if.end10, %entry 154 ret void 155} 156