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The function num_get<_CharT>::stage2_int_prep makes unnecessary copy of src into atoms when char_type is char. This can be avoided by creating a switch on type and just returning __src when char_type is char. Added the test case to demonstrate performance improvement. In order to avoid ABI incompatibilities, the changes are guarded with a macro _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET Differential Revision: https://reviews.llvm.org/D30268 Reviewed by: EricWF llvm-svn: 305427