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Remove erroneous statements about negative zero.

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Nick Bowler 2012-02-19 01:38:37 +00:00 committed by Joseph Myers
parent 02c4bbad9c
commit cd837b09b5
3 changed files with 11 additions and 9 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2012-02-19 Nick Bowler <nbowler@draconx.ca>
[BZ #11322]
* manual/arith.texi: Remove statements about negative zero
behaving identically to zero.
2012-02-18 Joseph Myers <joseph@codesourcery.com>
[BZ #5993]

6
NEWS
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@ -10,9 +10,9 @@ Version 2.16
* The following bugs are resolved with this release:
174, 350, 411, 3335, 4026, 4596, 4822, 5077, 5805, 5993, 6884, 6907, 9902,
10140, 10210, 11494, 12047, 13058, 13525, 13526, 13527, 13528, 13529,
13530, 13531, 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13559,
13583, 13618
10140, 10210, 11322, 11494, 12047, 13058, 13525, 13526, 13527, 13528,
13529, 13530, 13531, 13532, 13533, 13547, 13551, 13552, 13553, 13555,
13559, 13583, 13618
* ISO C11 support:

8
manual/arith.texi
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@ -657,9 +657,7 @@ such as by defining @code{_GNU_SOURCE}, and then you must include
@w{IEEE 754} also allows for another unusual value: negative zero. This
value is produced when you divide a positive number by negative
infinity, or when a negative result is smaller than the limits of
representation. Negative zero behaves identically to zero in all
calculations, unless you explicitly test the sign bit with
@code{signbit} or @code{copysign}.
representation.
@node Status bit operations
@subsection Examining the FPU status word
@ -926,9 +924,7 @@ If a result is too small to be represented as a denormalized number, it
is rounded to zero. However, the sign of the result is preserved; if
the calculation was negative, the result is @dfn{negative zero}.
Negative zero can also result from some operations on infinity, such as
@math{4/-@infinity{}}. Negative zero behaves identically to zero except
when the @code{copysign} or @code{signbit} functions are used to check
the sign bit directly.
@math{4/-@infinity{}}.
At any time one of the above four rounding modes is selected. You can
find out which one with this function: