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Dodge a compiler bug affecting timetz_zone/timetz_izone.

This avoids a compiler bug occurring in AIX's xlc, even in prettylate-model revisions. Buildfarm testing has now confirmed thatonly 64-bit xlc is affected. Although we are contemplatingdropping support for xlc in v17, it's still supported in theback branches, so we need this fix.Back-patch of code changes from HEAD commit19fa977.(The test cases were already back-patched, in4a427b8 et al.)Discussion:https://postgr.es/m/CA+hUKGK=DOC+hE-62FKfZy=Ybt5uLkrg3zCZD-jFykM-iPn8yw@mail.gmail.com

1 parentcdbe9c3 commitf4f55d5Copy full SHA for f4f55d5

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src/backend/utils/adt
- date.c

1 file changed

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`‎src/backend/utils/adt/date.c`

Lines changed: 6 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -2861,10 +2861,11 @@ timetz_zone(PG_FUNCTION_ARGS)`
`2861`	`2861`	`result= (TimeTzADT*)palloc(sizeof(TimeTzADT));`
`2862`	`2862`
`2863`	`2863`	`result->time=t->time+ (t->zone-tz)*USECS_PER_SEC;`
	`2864`	`+/* C99 modulo has the wrong sign convention for negative input */`
`2864`	`2865`	`while (result->time<INT64CONST(0))`
`2865`	`2866`	`result->time+=USECS_PER_DAY;`
`2866`		`-while (result->time >=USECS_PER_DAY)`
`2867`		`-result->time-=USECS_PER_DAY;`
	`2867`	`+if (result->time >=USECS_PER_DAY)`
	`2868`	`+result->time%=USECS_PER_DAY;`
`2868`	`2869`
`2869`	`2870`	`result->zone=tz;`
`2870`	`2871`
`@@ -2894,10 +2895,11 @@ timetz_izone(PG_FUNCTION_ARGS)`
`2894`	`2895`	`result= (TimeTzADT*)palloc(sizeof(TimeTzADT));`
`2895`	`2896`
`2896`	`2897`	`result->time=time->time+ (time->zone-tz)*USECS_PER_SEC;`
	`2898`	`+/* C99 modulo has the wrong sign convention for negative input */`
`2897`	`2899`	`while (result->time<INT64CONST(0))`
`2898`	`2900`	`result->time+=USECS_PER_DAY;`
`2899`		`-while (result->time >=USECS_PER_DAY)`
`2900`		`-result->time-=USECS_PER_DAY;`
	`2901`	`+if (result->time >=USECS_PER_DAY)`
	`2902`	`+result->time%=USECS_PER_DAY;`
`2901`	`2903`
`2902`	`2904`	`result->zone=tz;`
`2903`	`2905`

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Commitf4f55d5

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`‎src/backend/utils/adt/date.c`

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