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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2023-10-20 13:40:15 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2023-10-20 13:40:15 -0400 |
| commit | d8c2877b9efafd37505f3cbb2cc2a7072d955667 (patch) | |
| tree | 28bbb707151f96be1eb4790e950afe0dcbca9331 /src | |
| parent | ed697c4040653cfeaff859078302517a198c9446 (diff) | |
| download | postgresql-d8c2877b9efafd37505f3cbb2cc2a7072d955667.tar.gz postgresql-d8c2877b9efafd37505f3cbb2cc2a7072d955667.zip | |
Dodge a compiler bug affecting timetz_zone/timetz_izone.
This avoids a compiler bug occurring in AIX's xlc, even in pretty
late-model revisions. Buildfarm testing has now confirmed that
only 64-bit xlc is affected. Although we are contemplating
dropping support for xlc in v17, it's still supported in the
back branches, so we need this fix.
Back-patch of code changes from HEAD commit 19fa97731.
(The test cases were already back-patched, in 4a427b82c et al.)
Discussion: https://postgr.es/m/CA+hUKGK=DOC+hE-62FKfZy=Ybt5uLkrg3zCZD-jFykM-iPn8yw@mail.gmail.com
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/utils/adt/date.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/backend/utils/adt/date.c b/src/backend/utils/adt/date.c index 8e9473a9e14..bff81eb0804 100644 --- a/src/backend/utils/adt/date.c +++ b/src/backend/utils/adt/date.c @@ -2830,10 +2830,11 @@ timetz_zone(PG_FUNCTION_ARGS) result = (TimeTzADT *) palloc(sizeof(TimeTzADT)); result->time = t->time + (t->zone - tz) * USECS_PER_SEC; + /* C99 modulo has the wrong sign convention for negative input */ while (result->time < INT64CONST(0)) result->time += USECS_PER_DAY; - while (result->time >= USECS_PER_DAY) - result->time -= USECS_PER_DAY; + if (result->time >= USECS_PER_DAY) + result->time %= USECS_PER_DAY; result->zone = tz; @@ -2863,10 +2864,11 @@ timetz_izone(PG_FUNCTION_ARGS) result = (TimeTzADT *) palloc(sizeof(TimeTzADT)); result->time = time->time + (time->zone - tz) * USECS_PER_SEC; + /* C99 modulo has the wrong sign convention for negative input */ while (result->time < INT64CONST(0)) result->time += USECS_PER_DAY; - while (result->time >= USECS_PER_DAY) - result->time -= USECS_PER_DAY; + if (result->time >= USECS_PER_DAY) + result->time %= USECS_PER_DAY; result->zone = tz; |