diff options
Diffstat (limited to 'src/backend/utils/adt/float.c')
| -rw-r--r-- | src/backend/utils/adt/float.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/src/backend/utils/adt/float.c b/src/backend/utils/adt/float.c index 2660bd3e31f..d4e551b5edb 100644 --- a/src/backend/utils/adt/float.c +++ b/src/backend/utils/adt/float.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.136 2007/01/03 04:21:47 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.137 2007/01/03 14:35:24 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -1440,11 +1440,19 @@ dpow(PG_FUNCTION_ARGS) /* * pow() sets errno only on some platforms, depending on whether it - * follows _IEEE_, _POSIX_, _XOPEN_, or _SVID_, so, for consistency, - * we don't consult it and just do our check below. + * follows _IEEE_, _POSIX_, _XOPEN_, or _SVID_, and some return Nan, + * so we check and set result properly. */ + errno = 0; result = pow(arg1, arg2); - + if (errno == ERANGE && isnan(result)) + { + if ((fabs(arg1) > 1 && arg2 >= 0) || (fabs(arg1) < 1 && arg2 < 0)) + result = (arg1 >= 0) ? get_float8_infinity() : -get_float8_infinity(); + else + result = 0; + } + CHECKFLOATVAL(result, isinf(arg1) || isinf(arg2), arg1 == 0); PG_RETURN_FLOAT8(result); } @@ -1461,10 +1469,19 @@ dexp(PG_FUNCTION_ARGS) /* * exp() sets errno only on some platforms, depending on whether it - * follows _IEEE_, _POSIX_, _XOPEN_, or _SVID_, so, for consistency, - * we don't consult it and just do our check below. + * follows _IEEE_, _POSIX_, _XOPEN_, or _SVID_, and some return Nan, + * so we check and set result properly. */ + errno = 0; result = exp(arg1); + if (errno == ERANGE && isnan(result)) + { + if (arg1 >= 0) + result = get_float8_infinity(); + else + result = 0; + } + CHECKFLOATVAL(result, isinf(arg1), false); PG_RETURN_FLOAT8(result); |