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Assertions were originally enabled in the compiled-in floating-point std::to_chars implementation to help shake out any bugs, but they apparently impose a significant performance penalty, most notably for the hex formatting which is around 25% slower with assertions enabled. This seems too high a cost for unconditionally enabling them. The newly added calls to __builtin_unreachable work around the compiler no longer knowing that the set of valid values of 'fmt' is limited (which was previously upheld by an assert). libstdc++-v3/ChangeLog: * src/c++17/floating_to_chars.cc (_GLIBCXX_ASSERTIONS): Don't define. (__floating_to_chars_shortest): Add __builtin_unreachable calls to squelch false-positive -Wmaybe-uninitialized and -Wreturn-type warnings. (__floating_to_chars_precision): Likewise. |
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| config | ||
| doc | ||
| include | ||
| libsupc++ | ||
| po | ||
| python | ||
| scripts | ||
| src | ||
| testsuite | ||
| acinclude.m4 | ||
| aclocal.m4 | ||
| ChangeLog | ||
| ChangeLog-1998 | ||
| ChangeLog-1999 | ||
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| ChangeLog-2016 | ||
| ChangeLog-2017 | ||
| ChangeLog-2018 | ||
| ChangeLog-2019 | ||
| ChangeLog-2020 | ||
| ChangeLog-2021 | ||
| config.h.in | ||
| configure | ||
| configure.ac | ||
| configure.host | ||
| crossconfig.m4 | ||
| fragment.am | ||
| linkage.m4 | ||
| Makefile.am | ||
| Makefile.in | ||
| README | ||
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.