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

While xlc defines __64BIT__, gcc does not. Due to this oversight incommit30ee5d1, gcc builds continuedimplementing 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

1 parentdc14aa0 commitd41cb63Copy full SHA for d41cb63

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src/include/port/atomics
- arch-ppc.h

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`‎src/include/port/atomics/arch-ppc.h‎`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -32,14 +32,14 @@ typedef struct pg_atomic_uint32`
`32`	`32`	`}pg_atomic_uint32;`
`33`	`33`
`34`	`34`	`/* 64bit atomics are only supported in 64bit mode */`
`35`		`-#ifdef__64BIT__`
	`35`	`+#ifSIZEOF_VOID_P >=8`
`36`	`36`	`#definePG_HAVE_ATOMIC_U64_SUPPORT`
`37`	`37`	`typedefstructpg_atomic_uint64`
`38`	`38`	`{`
`39`	`39`	`volatileuint64valuepg_attribute_aligned(8);`
`40`	`40`	`}pg_atomic_uint64;`
`41`	`41`
`42`		`-#endif/* __64BIT__ */`
	`42`	`+#endif`
`43`	`43`
`44`	`44`	`/*`
`45`	`45`	`* This mimics gcc __atomic_compare_exchange_n(..., __ATOMIC_SEQ_CST), but`

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Commitd41cb63

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`‎src/include/port/atomics/arch-ppc.h‎`

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