33 lines
930 B
C
33 lines
930 B
C
/*-------------------------------------------------------------------------
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*
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* arch-arm.h
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* Atomic operations considerations specific to ARM
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*
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* Portions Copyright (c) 2013-2023, PostgreSQL Global Development Group
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*
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* NOTES:
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*
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* src/include/port/atomics/arch-arm.h
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*
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*-------------------------------------------------------------------------
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*/
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/* intentionally no include guards, should only be included by atomics.h */
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#ifndef INSIDE_ATOMICS_H
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#error "should be included via atomics.h"
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#endif
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/*
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* 64 bit atomics on ARM32 are implemented using kernel fallbacks and thus
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* might be slow, so disable entirely. On ARM64 that problem doesn't exist.
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*/
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#if !defined(__aarch64__)
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#define PG_DISABLE_64_BIT_ATOMICS
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#else
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/*
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* Architecture Reference Manual for ARMv8 states aligned read/write to/from
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* general purpose register is atomic.
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*/
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#define PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY
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#endif /* __aarch64__ */
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