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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
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# 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