1 # RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -run-pass=postrapseudos -o - %s | FileCheck %s 2 # 3 # Test that a COPY with an undef source operand gets handled like an identity 4 # copy rather than lowered into a target instruction with the undef flag 5 # dropped. 6 --- 7 # CHECK-LABEL: name: undef_copy 8 # CHECK: $r13d = KILL undef $r0d, implicit killed $r12q, implicit-def $r12q 9 name: undef_copy 10 tracksRegLiveness: true 11 body: | 12 bb.0: 13 liveins: $r12q 14 $r13d = COPY undef $r0d, implicit killed $r12q, implicit-def $r12q 15
