[Gc] Fwd: sync_val_compare_and_swap equivalent in libatomic_ops (mips)

Ivan Maidanski ivmai at mail.ru
Wed Nov 30 07:34:26 PST 2011

Hi Thiemo,

Could you please test "ao_val_cas" branch on mips? (I've added implementations for fetch-and-add, test-and-set, fetch-compare-and-swap.)



16 11 2011, 21:07 Ivan Maidanski <ivmai at mail.ru>:
> Hi all,
> I've added CAS primitive which returns old value instead of comparison result (the similar primitives in GCC are __sync_val_compare_and_swap and __sync_bool_compare_and_swap, respectively). I've named the primitive as AO_fetch_compare_and_swap.
> I've added implementations for emulations, x86, x64, arm v6, Hexagon (not tested), ia64 (trivial but not tested), ppc (not tested) targets.
> Meanwhile, alpha, avr, m68k, mips, s390, sparc lack such CAS primitive for now (unless via emulation) - I'm unable to do this without help from the community.
> For some targets (e.g., ia64), old bool CAS primitives containing "return oldval_fetched == oldval_expected" statement are completely removed from "sysdeps" part as they are implemented in generalize.h (and generalize-small.h).
> The functionality is available in ao_val_cas branch for testing period.
> For implementation details, see the differences from master branch - https://github.com/ivmai/libatomic_ops/compare/master...ao_val_cas
> Tests for new CAS has been added, so please everyone is welcomed to participate in testing:
> git clone git://github.com/ivmai/libatomic_ops.git -b ao_val_cas
> cd libatomic_ops
> autoreconf -vif
> ./configure
> make check
> Regards.

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