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Test pg_atomic_fetch_add_ with variable addend and 16-bit edge cases.

Back-patch to 9.5, which introduced these functions.Reviewed by Tom Lane.Discussion:https://postgr.es/m/20190831071157.GA3251746@rfd.leadboat.com

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src/test/regress
- regress.c

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+16

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`‎src/test/regress/regress.c‎`

Lines changed: 16 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -687,7 +687,7 @@ test_atomic_uint32(void)`
`687`	`687`	`if (pg_atomic_read_u32(&var)!=3)`
`688`	`688`	`elog(ERROR,"atomic_read_u32() #2 wrong");`
`689`	`689`
`690`		`-if (pg_atomic_fetch_add_u32(&var,1)!=3)`
	`690`	`+if (pg_atomic_fetch_add_u32(&var,pg_atomic_read_u32(&var)-2)!=3)`
`691`	`691`	`elog(ERROR,"atomic_fetch_add_u32() #1 wrong");`
`692`	`692`
`693`	`693`	`if (pg_atomic_fetch_sub_u32(&var,1)!=4)`
`@@ -712,6 +712,20 @@ test_atomic_uint32(void)`
`712`	`712`	`if (pg_atomic_fetch_add_u32(&var,INT_MAX)!=INT_MAX)`
`713`	`713`	`elog(ERROR,"pg_atomic_add_fetch_u32() #3 wrong");`
`714`	`714`
	`715`	`+pg_atomic_fetch_add_u32(&var,2);/* wrap to 0 */`
	`716`	`+`
	`717`	`+if (pg_atomic_fetch_add_u32(&var,PG_INT16_MAX)!=0)`
	`718`	`+elog(ERROR,"pg_atomic_fetch_add_u32() #3 wrong");`
	`719`	`+`
	`720`	`+if (pg_atomic_fetch_add_u32(&var,PG_INT16_MAX+1)!=PG_INT16_MAX)`
	`721`	`+elog(ERROR,"pg_atomic_fetch_add_u32() #4 wrong");`
	`722`	`+`
	`723`	`+if (pg_atomic_fetch_add_u32(&var,PG_INT16_MIN)!=2*PG_INT16_MAX+1)`
	`724`	`+elog(ERROR,"pg_atomic_fetch_add_u32() #5 wrong");`
	`725`	`+`
	`726`	`+if (pg_atomic_fetch_add_u32(&var,PG_INT16_MIN-1)!=PG_INT16_MAX)`
	`727`	`+elog(ERROR,"pg_atomic_fetch_add_u32() #6 wrong");`
	`728`	`+`
`715`	`729`	`pg_atomic_fetch_add_u32(&var,1);/* top up to UINT_MAX */`
`716`	`730`
`717`	`731`	`if (pg_atomic_read_u32(&var)!=UINT_MAX)`
`@@ -787,7 +801,7 @@ test_atomic_uint64(void)`
`787`	`801`	`if (pg_atomic_read_u64(&var)!=3)`
`788`	`802`	`elog(ERROR,"atomic_read_u64() #2 wrong");`
`789`	`803`
`790`		`-if (pg_atomic_fetch_add_u64(&var,1)!=3)`
	`804`	`+if (pg_atomic_fetch_add_u64(&var,pg_atomic_read_u64(&var)-2)!=3)`
`791`	`805`	`elog(ERROR,"atomic_fetch_add_u64() #1 wrong");`
`792`	`806`
`793`	`807`	`if (pg_atomic_fetch_sub_u64(&var,1)!=4)`

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Commit5b5b0f7

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`‎src/test/regress/regress.c‎`

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