Remove numerous references to VAX floating-point and the setting of

errno, replacing them with a discussion of IEEE exceptions where
appropriate.  Cross-reference fenv(3) whenever exceptions are
mentioned.

1 files changed, 10 insertions, 40 deletions

diff --git a/lib/msun/man/exp.3 b/lib/msun/man/exp.3
index 62e9e3e..326af58 100644
--- a/lib/msun/man/exp.3
+++ b/lib/msun/man/exp.3
@@ -32,7 +32,7 @@
 .\"     from: @(#)exp.3	6.12 (Berkeley) 7/31/91
 .\" $FreeBSD$
 .\"
-.Dd July 31, 1991
+.Dd January 14, 2005
 .Dt EXP 3
 .Os
 .Sh NAME
@@ -182,49 +182,18 @@ is exact until it is bigger than 2**56 on a
 These functions will return the appropriate computation unless an error
 occurs or an argument is out of range.
 The functions
-.Fn exp ,
-.Fn expm1 ,
-.Fn pow
-detect if the computed value will overflow,
-set the global variable
-.Va errno
-to
-.Er ERANGE
-and cause a reserved operand fault on a
-.Tn VAX
-or
-.Tn Tahoe .
-The functions
 .Fn pow x y
-checks to see if
+and
+.Fn powf x y
+raise an invalid exception and return an \*(Na if
 .Fa x
 < 0 and
 .Fa y
-is not an integer, in the event this is true,
-the global variable
-.Va errno
-is set to
-.Er EDOM
-and on the
-.Tn VAX
-and
-.Tn Tahoe
-generate a reserved operand fault.
-On a
-.Tn VAX
-and
-.Tn Tahoe ,
-.Va errno
-is set to
-.Er EDOM
-and the reserved operand is returned
-by log unless
-.Fa x
-> 0, by
-.Fn log1p
-unless
-.Fa x
-> \-1.
+is not an integer.
+An attempt to take the logarithm of \*(Pm0 will result in
+a divide-by-zero exception, and an infinity will be returned.
+An attempt to take the logarithm of a negative number will
+result in an invalid exception, and an \*(Na will be generated.
 .Sh NOTES
 The functions exp(x)\-1 and log(1+x) are called
 expm1 and logp1 in
@@ -304,6 +273,7 @@ then \*(Na**0 = 1 too because x**0 = 1 for all finite
 and infinite x, i.e., independently of x.
 .El
 .Sh SEE ALSO
+.Xr fenv 3 ,
 .Xr math 3
 .Sh HISTORY
 A