llvm.org GIT mirror llvm / release_80 test / CodeGen / SystemZ / lower-copy-undef-src.mir
release_80

Tree @release_80 (Download .tar.gz)

lower-copy-undef-src.mir @release_80raw · history · blame

# 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