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For ppc gcc, implement 64-bit compare_exchange and fetch_add with asm.

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While xlc defines __64BIT__, gcc does not.  Due to this oversight in
commit 30ee5d17c20dbb282a9952b3048d6ad52d56c371, gcc builds continued
implementing 64-bit atomics by way of intrinsics.  Back-patch to v13,
where that commit first appeared.

Reviewed by Tom Lane.

Discussion: https://postgr.es/m/20201011051043.GA1724101@rfd.leadboat.com
This commit is contained in:
Noah Misch 2020-10-11 21:31:37 -07:00
parent dc14aa038e
commit d41cb63ff4
1 changed files with 2 additions and 2 deletions
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4
src/include/port/atomics/arch-ppc.h
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@ -32,14 +32,14 @@ typedef struct pg_atomic_uint32
} pg_atomic_uint32;
/* 64bit atomics are only supported in 64bit mode */
#ifdef __64BIT__
#if SIZEOF_VOID_P >= 8
#define PG_HAVE_ATOMIC_U64_SUPPORT
typedef struct pg_atomic_uint64
{
volatile uint64 value pg_attribute_aligned(8);
} pg_atomic_uint64;
#endif /* __64BIT__ */
#endif
/*
* This mimics gcc __atomic_compare_exchange_n(..., __ATOMIC_SEQ_CST), but