| # RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -run-pass=postrapseudos -o - %s | FileCheck %s | |
| # | |
| # Test that a COPY with an undef source operand gets handled like an identity | |
| # copy rather than lowered into a target instruction with the undef flag | |
| # dropped. | |
| --- | |
| # CHECK-LABEL: name: undef_copy | |
| # CHECK: %r13d = KILL undef %r0d, implicit killed %r12q, implicit-def %r12q | |
| name: undef_copy | |
| tracksRegLiveness: true | |
| body: | | |
| bb.0: | |
| liveins: %r12q | |
| %r13d = COPY undef %r0d, implicit killed %r12q, implicit-def %r12q |