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Some targets use IEEE binary64 for both double and long double, which means we could use memmove to optimize a std::copy from a range of double to a range of long double. We currently have no config macro to detect when long double is binary64, so add that to <bits/c++config.h>. This also adds config macros for the case where double and long double both use the same binary32 format as float, which is true for the avr target. No specializations of __memcpyable for that case are added by this patch, but they could be added later. libstdc++-v3/ChangeLog: * include/bits/c++config (_GLIBCXX_DOUBLE_IS_IEEE_BINARY32): Define. (_GLIBCXX_LDOUBLE_IS_IEEE_BINARY64): Define. (_GLIBCXX_LDOUBLE_IS_IEEE_BINARY32): Define. * include/bits/cpp_type_traits.h (__memcpyable): Define specializations when double and long double are compatible. Reviewed-by: Patrick Palka <ppalka@redhat.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.