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/*------------------------------------------------------------------------- * * arch-arm.h * Atomic operations considerations specific to ARM * * Portions Copyright (c) 2013-2024, PostgreSQL Global Development Group * * NOTES: * * src/include/port/atomics/arch-arm.h * *------------------------------------------------------------------------- */ /* intentionally no include guards, should only be included by atomics.h */ #ifndef INSIDE_ATOMICS_H #error "should be included via atomics.h" #endif /* * 64 bit atomics on ARM32 are implemented using kernel fallbacks and thus * might be slow, so disable entirely. On ARM64 that problem doesn't exist. */ #if !defined(__aarch64__) #define PG_DISABLE_64_BIT_ATOMICS #else /* * Architecture Reference Manual for ARMv8 states aligned read/write to/from * general purpose register is atomic. */ #define PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY #endif /* __aarch64__ */