Wilco Dijkstra 3fa689f6ed libatomic: Enable lock-free 128-bit atomics on AArch64 ... Enable lock-free 128-bit atomics on AArch64. This is backwards compatible with existing binaries (as for these GCC always calls into libatomic, so all 128-bit atomic uses in a process are switched), gives better performance than locking atomics and is what most users expect. 128-bit atomic loads use a load/store exclusive loop if LSE2 is not supported. This results in an implicit store which is invisible to software as long as the given address is writeable (which will be true when using atomics in real code). This doesn't yet change __atomic_is_lock_free eventhough all atomics are finally lock-free on AArch64. libatomic: * config/linux/aarch64/atomic_16.S: Implement lock-free ARMv8.0 atomics. (libat_exchange_16): Merge RELEASE and ACQ_REL/SEQ_CST cases. * config/linux/aarch64/host-config.h: Use atomic_16.S for baseline v8.0.		2023-12-15 13:19:41 +00:00
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atomic_16.S	libatomic: Enable lock-free 128-bit atomics on AArch64	2023-12-15 13:19:41 +00:00
host-config.h	libatomic: Enable lock-free 128-bit atomics on AArch64	2023-12-15 13:19:41 +00:00