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Blind try to fix portability issue in commit8f93bd8 et al.

The S/390 members of the buildfarm are showing failures indicatingthat they're having trouble with the rint() calls I added yesterday.There's no good reason for that, and I wonder if it is a compiler bugsimilar to the one we worked around ind9476b8. Try to fix it usingthe same method as before, namely to store the result of rint() backinto a "double" variable rather than immediately converting to int64.(This isn't entirely waving a dead chicken, since on machines withwider-than-double float registers, the extra store forces a widthconversion. I don't know if S/390 is like that, but it seems worthtrying.)In passing, merge duplicate ereport() calls in float8_timestamptz().Per buildfarm.

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src/backend/utils/adt
- timestamp.c

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`‎src/backend/utils/adt/timestamp.c‎`

Lines changed: 6 additions & 8 deletions

Original file line number	Diff line number	Diff line change
`@@ -773,12 +773,8 @@ float8_timestamptz(PG_FUNCTION_ARGS)`
`773`	`773`	`{`
`774`	`774`	`/* Out of range? */`
`775`	`775`	`if (seconds<`
`776`		`-(float8)SECS_PER_DAY* (DATETIME_MIN_JULIAN-UNIX_EPOCH_JDATE))`
`777`		`-ereport(ERROR,`
`778`		`-(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),`
`779`		`-errmsg("timestamp out of range: \"%g\"",seconds)));`
`780`		`-`
`781`		`-if (seconds >=`
	`776`	`+(float8)SECS_PER_DAY* (DATETIME_MIN_JULIAN-UNIX_EPOCH_JDATE)`
	`777`	`+\|\|seconds >=`
`782`	`778`	`(float8)SECS_PER_DAY* (TIMESTAMP_END_JULIAN-UNIX_EPOCH_JDATE))`
`783`	`779`	`ereport(ERROR,`
`784`	`780`	`(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),`
`@@ -788,7 +784,8 @@ float8_timestamptz(PG_FUNCTION_ARGS)`
`788`	`784`	`seconds-= ((POSTGRES_EPOCH_JDATE-UNIX_EPOCH_JDATE)*SECS_PER_DAY);`
`789`	`785`
`790`	`786`	`#ifdefHAVE_INT64_TIMESTAMP`
`791`		`-result=rint(seconds*USECS_PER_SEC);`
	`787`	`+seconds=rint(seconds*USECS_PER_SEC);`
	`788`	`+result= (int64)seconds;`
`792`	`789`	`#else`
`793`	`790`	`result=seconds;`
`794`	`791`	`#endif`
`@@ -1624,9 +1621,10 @@ make_interval(PG_FUNCTION_ARGS)`
`1624`	`1621`	`result->day=weeks*7+days;`
`1625`	`1622`
`1626`	`1623`	`#ifdefHAVE_INT64_TIMESTAMP`
	`1624`	`+secs=rint(secs*USECS_PER_SEC);`
`1627`	`1625`	`result->time=hours* ((int64)SECS_PER_HOUR*USECS_PER_SEC)+`
`1628`	`1626`	`mins* ((int64)SECS_PER_MINUTE*USECS_PER_SEC)+`
`1629`		`-(int64)rint(secs*USECS_PER_SEC);`
	`1627`	`+(int64)secs;`
`1630`	`1628`	`#else`
`1631`	`1629`	`result->time=hours* (double)SECS_PER_HOUR+`
`1632`	`1630`	`mins* (double)SECS_PER_MINUTE+`

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`‎src/backend/utils/adt/timestamp.c‎`

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