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* tcg: Add atomic128 helpersRichard Henderson2016-10-261-1/+39
| | | | | | | | | | | | | | | Force the use of cmpxchg16b on x86_64. Wikipedia suggests that only very old AMD64 (circa 2004) did not have this instruction. Further, it's required by Windows 8 so no new cpus will ever omit it. If we truely care about these, then we could check this at startup time and then avoid executing paths that use it. Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
* tcg: Add atomic helpersRichard Henderson2016-10-261-0/+177
Add all of cmpxchg, op_fetch, fetch_op, and xchg. Handle both endian-ness, and sizes up to 8. Handle expanding non-atomically, when emulating in serial. Reviewed-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>