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rep/stos and rep/mov if the count is not a constant. We could do rep/stosl; and $count, 3; rep/stosb For now, I will lower them to memset / memcpy calls. We will revisit this after a little bit experiment. Also need to take care of the trailing bytes even if the count is a constant. Since the max. number of trailing bytes are 3, we will simply issue loads / stores. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26517 91177308-0d34-0410-b5e6-96231b3b80d8
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