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体验新版 GitCode,发现更多精彩内容 >>
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b2965b9f
编写于
1月 06, 2007
作者:
T
Tom Lane
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电子邮件补丁
差异文件
Put back ERANGE test in dpow(). There are platforms that need this,
like my HPPA ...
上级
561b4bae
变更
1
隐藏空白更改
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Showing
1 changed file
with
10 addition
and
7 deletion
+10
-7
src/backend/utils/adt/float.c
src/backend/utils/adt/float.c
+10
-7
未找到文件。
src/backend/utils/adt/float.c
浏览文件 @
b2965b9f
...
...
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.14
2 2007/01/05 22:19:40 momjian
Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.14
3 2007/01/06 02:28:38 tgl
Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -1442,24 +1442,27 @@ dpow(PG_FUNCTION_ARGS)
* pow() sets errno only on some platforms, depending on whether it
* follows _IEEE_, _POSIX_, _XOPEN_, or _SVID_, so we try to avoid
* using errno. However, some platform/CPU combinations return
* errno == EDOM and result == Nan, so we have to check for that and
* set result properly. For example, Linux on 32-bit x86 hardware
* returns EDOM/Nan for (-1) ^ 1e19, but (-1) ^ 1e18 returns
* 1 -- basically a negative base raised to a very high power causes
* it on some CPUs.
* errno == EDOM and result == Nan for negative arg1 and very large arg2
* (they must be using something different from our floor() test to
* decide it's invalid). Other platforms return errno == ERANGE and a
* large but finite result to signal overflow.
*/
errno
=
0
;
result
=
pow
(
arg1
,
arg2
);
if
(
errno
==
EDOM
&&
isnan
(
result
))
{
if
((
fabs
(
arg1
)
>
1
&&
arg2
>=
0
)
||
(
fabs
(
arg1
)
<
1
&&
arg2
<
0
))
/* The sign
i
f Inf is not significant in this case. */
/* The sign
o
f Inf is not significant in this case. */
result
=
get_float8_infinity
();
else
if
(
fabs
(
arg1
)
!=
1
)
result
=
0
;
else
result
=
1
;
}
else
if
(
errno
==
ERANGE
)
{
result
=
(
arg1
>=
0
)
?
get_float8_infinity
()
:
-
get_float8_infinity
();
}
CHECKFLOATVAL
(
result
,
isinf
(
arg1
)
||
isinf
(
arg2
),
arg1
==
0
);
PG_RETURN_FLOAT8
(
result
);
...
...
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