tree 88b79ff5565f830607dc55ef690513d380d3ccc0
parent e43c10d2019850118e3f6aec5438343f053991ce
author Jonas Paulsson <paulsson@linux.vnet.ibm.com> 1494570723 +0000
committer Jonas Paulsson <paulsson@linux.vnet.ibm.com> 1494570723 +0000

Handle a COPY with undef source operand in LowerCopy()

Llvm-stress discovered that a COPY may end up in ExpandPostRA::LowerCopy()
with an undef source operand. It is not possible for the target to handle
this, as this flag is not passed to TII->copyPhysReg().

This patch solves this by treating such a COPY as an identity COPY.

Review: Matthias Braun
https://reviews.llvm.org/D32892

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302877 91177308-0d34-0410-b5e6-96231b3b80d8