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84046d16eb
| This adds two implementations for each atomic_fcmpset_ and atomic_cmpset_ short and char functions, selectable at compile time for the target architecture. By default, it uses a generic shift-and-mask to perform atomic updates to sub-components of 32-bit words from <sys/_atomic_subword.h>. However, if ISA_206_ATOMICS is defined it uses the ll/sc instructions for halfword and bytes, introduced in PowerISA 2.06. These instructions are supported by all IBM processors from POWER7 on, as well as the Freescale/NXP e6500 core. Although the e5500 and e500mc both implement PowerISA 2.06 they do not implement these instructions. As part of this, clean up the atomic_(f)cmpset_acq and _rel wrappers, by using macros to reduce code duplication. ISA_206_ATOMICS requires clang or newer binutils (2.20 or later). Differential Revision: https://reviews.freebsd.org/D21682 |
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