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1; RUN: llc < %s | FileCheck %s2; Make sure we don't crash in AArch64RedundantCopyElimination when a3; MachineBasicBlock is empty. PR29035.4 5target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"6target triple = "aarch64-unknown-linux-gnu"7 8declare ptr @bar()9 10; CHECK-LABEL: foo:11; CHECK: tbz12; CHECK: mov{{.*}}, #113; CHECK: ret14; CHECK: bl bar15; CHECK: cbnz16; CHECK: ret17define i1 @foo(i1 %start) {18entry:19 br i1 %start, label %cleanup, label %if.end20 21if.end: ; preds = %if.end, %entry22 %call = tail call ptr @bar()23 %cmp = icmp eq ptr %call, null24 br i1 %cmp, label %cleanup, label %if.end25 26cleanup: ; preds = %if.end, %entry27 %retval.0 = phi i1 [ true, %entry ], [ false, %if.end ]28 ret i1 %retval.029}30