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; RUN: llc < %s | FileCheck %s
; Make sure we don't crash in AArch64RedundantCopyElimination when a
; MachineBasicBlock is empty. PR29035.
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-linux-gnu"
declare i8* @bar()
; CHECK-LABEL: foo:
; CHECK: tbz
; CHECK: mov{{.*}}, #1
; CHECK: ret
; CHECK: bl bar
; CHECK: cbnz
; CHECK: ret
define i1 @foo(i1 %start) {
entry:
br i1 %start, label %cleanup, label %if.end
if.end: ; preds = %if.end, %entry
%call = tail call i8* @bar()
%cmp = icmp eq i8* %call, null
br i1 %cmp, label %cleanup, label %if.end
cleanup: ; preds = %if.end, %entry
%retval.0 = phi i1 [ true, %entry ], [ false, %if.end ]
ret i1 %retval.0
}
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