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authorNick Bowler <nbowler@draconx.ca>2012-02-19 01:38:37 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-02-19 01:38:37 +0000
commitcd837b09b5f1cf4ce8bca27049899258fed83a4e (patch)
tree88df3d9653f12a44d0fc1ad2c798e6168667ec1f /manual
parent02c4bbad9ceb0bbe3bacbab56ce0f0fc66f10467 (diff)
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Remove erroneous statements about negative zero.
Diffstat (limited to 'manual')
-rw-r--r--manual/arith.texi8
1 files changed, 2 insertions, 6 deletions
diff --git a/manual/arith.texi b/manual/arith.texi
index c5795c2ed8..e160438938 100644
--- a/manual/arith.texi
+++ b/manual/arith.texi
@@ -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: