On Thu, 26 Oct 2023 14:17:02 GMT, Andrew Haley <a...@openjdk.org> wrote:
>> A bug in GCC causes shared libraries linked with -ffast-math to disable >> denormal arithmetic. This breaks Java's floating-point semantics. >> >> The bug is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55522 >> >> One solution is to save and restore the floating-point control word around >> System.loadLibrary(). This isn't perfect, because some shared library might >> load another shared library at runtime, but it's a lot better than what we >> do now. >> >> However, this fix is not complete. `dlopen()` is called from many places in >> the JDK. I guess the best thing to do is find and wrap them all. I'd like to >> hear people's opinions. > > Andrew Haley has updated the pull request incrementally with one additional > commit since the last revision: > > Duh One more thought, it would be good to add the FTZ_mode_enabled check to `os::run_periodic_checks()`. We already do signal handler checks there, and it is the right place to check for "global things third party native code may mess up". It runs when one uses `-XX:CheckJNICalls`. If a native library messes with fenv, one will get a delayed assertion, with a hs-err file that lists all the shared objects. ------------- PR Comment: https://git.openjdk.org/jdk/pull/10661#issuecomment-1781408815
