llvm-mirror/test/MachineVerifier/live-ins-01.mir

# RUN: not llc -o - %s -mtriple=s390x-linux-gnu -mcpu=z14 -run-pass none 2>&1 | FileCheck %s
# REQUIRES: systemz-registered-target

# Test that a the machine verifier reports an error when a register in
# liveins is not liveout from predecessor.

---
name:            f1
tracksRegLiveness: true
machineFunctionInfo: {}
body:             |
  bb.0:
    liveins: $r2l, $r3l
  
    %1:gr32bit = COPY $r3l
    %0:gr32bit = COPY $r2l
    CHIMux %0, 0, implicit-def $cc

  bb.1:
    liveins: $cc

  bb.2:
    liveins: $cc

    %2:grx32bit = LOCRMux %1, %0, 14, 8, implicit $cc
    $r2l = COPY %2
    Return implicit $r2l
...

# CHECK: *** Bad machine code: Live in register not found to be live out from predecessor. ***
# CHECK:- function:    f2
# CHECK:- basic block: %bb.2
# CHECK:CC not found to be live out from %bb.1
---
name:            f2
tracksRegLiveness: true
machineFunctionInfo: {}
body:             |
  bb.0:
    liveins: $r2l, $r3l
  
    %1:gr32bit = COPY $r3l
    %0:gr32bit = COPY $r2l
    CHIMux %0, 0, implicit-def $cc

  bb.1:
    liveins: $cc
    KILL killed $cc

  bb.2:
    liveins: $cc

    %2:grx32bit = LOCRMux %1, %0, 14, 8, implicit $cc
    $r2l = COPY %2
    Return implicit $r2l

...