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

bmomjian · bmomjian · commit 138668ca37d3 · 2007-01-05T03:19:26.000Z
Stefan Kaltenbrunner
diff --git 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 1.140 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.
 	 */

Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@`
`8`	`8`	`*`
`9`	`9`	`*`
`10`	`10`	`* IDENTIFICATION`
`11`		`- * $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.140 2007/01/04 05:18:39 momjian Exp $`
	`11`	`+ * $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.141 2007/01/05 03:19:26 momjian Exp $`
`12`	`12`	`*`
`13`	`13`	`*-------------------------------------------------------------------------`
`14`	`14`	`*/`
`@@ -1443,8 +1443,8 @@ dpow(PG_FUNCTION_ARGS)`
`1443`	`1443`	`* follows _IEEE_, _POSIX_, _XOPEN_, or _SVID_, so we try to avoid`
`1444`	`1444`	`* using errno. However, some platform/CPU combinations return`
`1445`	`1445`	`* errno == EDOM and result == Nan, so we have to check for that and`
`1446`		`- * set result properly. For example, Linux on Pentium, pre-Xeon`
`1447`		`- * hardware returns EDOM/Nan for (-1) ^ 1e19, but (-1) ^ 1e18 retuns`
	`1446`	`+ * set result properly. For example, Linux on 32-bit x86 hardware`
	`1447`	`+ * returns EDOM/Nan for (-1) ^ 1e19, but (-1) ^ 1e18 returns`
`1448`	`1448`	`* 1 -- basically a negative base raised to a very high power causes`
`1449`	`1449`	`* it on some CPUs.`
`1450`	`1450`	`*/`