Wilco Dijkstra
d1288d8509
Add support for AArch64 LSE and LSE2 to libatomic. Disable outline atomics, and use LSE ifuncs for 1-8 byte atomics and LSE2 ifuncs for 16-byte atomics. On Neoverse V1, 16-byte atomics are ~4x faster due to avoiding locks. Note this is safe since we swap all 16-byte atomics using the same ifunc, so they either use locks or LSE2 atomics, but never a mix. This also improves ABI compatibility with LLVM: its inlined 16-byte atomics are compatible with the new libatomic if LSE2 is supported. libatomic/ * Makefile.in: Regenerated with automake 1.15.1. * Makefile.am: Add atomic_16.S for AArch64. * configure.tgt: Disable outline atomics in AArch64 build. * config/linux/aarch64/atomic_16.S: New file - implementation of ifuncs for 16-byte atomics. * config/linux/aarch64/host-config.h: Enable ifuncs, use LSE (HWCAP_ATOMICS) for 1-8-byte atomics and LSE2 (HWCAP_USCAT) for 16-byte atomics.
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