https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126293
admin_public at liblfds dot org changed:
What |Removed |Added
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CC| |admin_public at liblfds dot org
--- Comment #4 from admin_public at liblfds dot org ---
> It would be nice if GCC offered an option to do that, avoiding the overhead
> of calling into libatomic.
IIRC, if atomics not supported, libatomic provides a non-atomic fallback, which
is specifically wrong and actually *not viable* for some use cases, because now
you have sleeps (and also an order*s* of magnitude performance difference,
which is fine if you're taking like one lock, once, but if you have a data
structure, it's game over).
I had to specifically *avoid* libatomic because of this, writing my own on-line
assembly.
Compiler intrinsics avoid this problem, and allow me to get rid of my own
assembly.
