1; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -enable-if-conversion 2 3target 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-S128" 4target triple = "x86_64-apple-macosx10.8.0" 5 6define fastcc void @DD_dump() nounwind uwtable ssp { 7entry: 8 br i1 undef, label %lor.lhs.false, label %if.end25 9 10lor.lhs.false: ; preds = %entry 11 br i1 undef, label %if.end21, label %if.else 12 13if.else: ; preds = %lor.lhs.false 14 br i1 undef, label %num_q.exit, label %while.body.i.preheader 15 16while.body.i.preheader: ; preds = %if.else 17 br label %while.body.i 18 19while.body.i: ; preds = %if.end.i, %while.body.i.preheader 20 switch i8 undef, label %if.end.i [ 21 i8 39, label %if.then.i 22 i8 92, label %if.then.i 23 ] 24 25if.then.i: ; preds = %while.body.i, %while.body.i 26 br label %if.end.i 27 28if.end.i: ; preds = %if.then.i, %while.body.i 29 br i1 undef, label %num_q.exit, label %while.body.i 30 31num_q.exit: ; preds = %if.end.i, %if.else 32 unreachable 33 34if.end21: ; preds = %lor.lhs.false 35 unreachable 36 37if.end25: ; preds = %entry 38 ret void 39} 40 41; PR15990 42; We can have basic blocks with single entry PHI nodes. 43define void @single_entry_phi(i32* %a, i32 *%b) { 44entry: 45 br label %for.cond1.preheader 46 47for.cond1.preheader: 48 %inc10 = phi i32 [ 0, %entry ], [ %inc, %for.end ] 49 br label %for.end 50 51for.end: 52 %malicious.phi = phi i32 [ 0, %for.cond1.preheader ] 53 %inc = add nsw i32 %inc10, 1 54 %tobool = icmp eq i32 %inc, 0 55 br i1 %tobool, label %for.cond.for.end5, label %for.cond1.preheader 56 57for.cond.for.end5: 58 %and.lcssa = phi i32 [ %malicious.phi, %for.end ] 59 store i32 %and.lcssa, i32* %a, align 4 60 ret void 61} 62