Follow-up Comment #4, bug #33392 (project gnustep):
IIRC, if GCC is compiling for a general x86 machine, it will
generate code that can run on any i386 processor even produced;
hence it won't use CPU operations available only in newer CPUs.
So atomic builtins will become calls to custom functions (and
could be even slower than a pthread lock).
To use atomic builtins, you need to tell GCC that the CPU is more
than just a generic ix86 by using -march=pentium or something like
that. I'm not sure of the exact -march= or -mtune= option that we
want to use; we need to look up the options and study them.
The extreme option would be to use -march=native, which would
provide fast code, but most likely not portable.
Thanks
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