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Update float dpow() comment about whick platforms had issues with Nan.

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Stefan Kaltenbrunner
This commit is contained in:
Bruce Momjian 2007-01-05 03:19:26 +00:00
parent 53c26d6f8f
commit 138668ca37
1 changed files with 3 additions and 3 deletions
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6
src/backend/utils/adt/float.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.140 2007/01/04 05:18:39 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.141 2007/01/05 03:19:26 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -1443,8 +1443,8 @@ dpow(PG_FUNCTION_ARGS)
* 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 Pentium, pre-Xeon
* hardware returns EDOM/Nan for (-1) ^ 1e19, but (-1) ^ 1e18 retuns
* 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.
*/