| /*------------------------------------------------------------------------- |
| * |
| * arch-arm.h |
| * Atomic operations considerations specific to ARM |
| * |
| * Portions Copyright (c) 2013-2023, 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__ */ |
