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1; Test that the backend does not mess up the I/R in case of a use of an undef2; register. This typically happens while expanding a pseudo or otherwise3; replacing an instruction for another.4;5; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 -verify-machineinstrs | FileCheck %s6 7; LLCRMux8define void @f1(ptr) {9; CHECK-LABEL: f1:10; CHECK-NOT: *** Bad machine code: Using an undefined physical register ***11BB:12 %L5 = load i8, ptr %013 %B9 = lshr i8 %L5, -114 br label %CF15 16CF: ; preds = %CF, %BB17 %Cmp25 = icmp ne i8 27, %B918 br i1 %Cmp25, label %CF, label %CF3419 20CF34: ; preds = %CF21 ret void22}23