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Enable 64 bit atomics on ARM64.

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Previously they were disabled due to performance concerns on 32bit
arm, where 64bit atomics are often implemented via kernel traps.

Author: Roman Shaposhnik
Discussion: http://postgr.es/m/CA+ULb+uErkFuXUCCXWHYvnV5KnAyjGUzzRcPA-M0cgO+Hm4RSA@mail.gmail.com
This commit is contained in:
Andres Freund 2017-03-10 11:14:06 -08:00
parent f39ddd8436
commit f8f1430ae7
1 changed files with 4 additions and 3 deletions
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7
src/include/port/atomics/arch-arm.h
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@ -18,8 +18,9 @@
#endif
/*
* 64 bit atomics on arm are implemented using kernel fallbacks and might be
* slow, so disable entirely for now.
* XXX: We might want to change that at some point for AARCH64
* 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__) && !defined(__aarch64)
#define PG_DISABLE_64_BIT_ATOMICS
#endif /* __aarch64__ || __aarch64 */