Add zero-length check to memcpy/memset load store loop expansion
Summary:
I was testing using this expansion logic in other cases besides
NVPTX, and found some runtime failures due to the lack of a check
for a zero length memcpy/memset before the loop. There is already
such a check in the memmove expansion code though.
Reviewers: hfinkel
Subscribers: jholewinski, wdng, llvm-commits
Differential Revision: https://reviews.llvm.org/D34707
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306541
91177308-0d34-0410-b5e6-
96231b3b80d8
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