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There's no point in copying around constants, so, when all else fails, we can still transform memcpy of memset into two independent memsets. To quote the example, we can turn: memset(dst1, c, dst1_size); memcpy(dst2, dst1, dst2_size); into: memset(dst1, c, dst1_size); memset(dst2, c, dst2_size); When dst2_size <= dst1_size. Like r235232 for copy constructors, this can occur in move constructors. Differential Revision: http://reviews.llvm.org/D9682 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237506 91177308-0d34-0410-b5e6-96231b3b80d8
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