| ; Test that the backend does not mess up the I/R in case of a use of an undef |
| ; register. This typically happens while expanding a pseudo or otherwise |
| ; replacing an instruction for another. |
| ; |
| ; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 -verify-machineinstrs | FileCheck %s |
| |
| ; LLCRMux |
| define void @f1(ptr) { |
| ; CHECK-LABEL: f1: |
| ; CHECK-NOT: *** Bad machine code: Using an undefined physical register *** |
| BB: |
| %L5 = load i8, ptr %0 |
| %B9 = lshr i8 %L5, -1 |
| br label %CF |
| |
| CF: ; preds = %CF, %BB |
| %Cmp25 = icmp ne i8 27, %B9 |
| br i1 %Cmp25, label %CF, label %CF34 |
| |
| CF34: ; preds = %CF |
| ret void |
| } |
