[PATCH] Remove misleading statement about raising of FE_INVALID (bug 24078)

[Joseph Myers]

On Wed, 9 Jan 2019, Gabriel F. T. Gomes wrote:

> See bugzilla entry for a longer description.
> 
> -- 8< --
> In the floating-point comparisons `==' and `<', there is no difference
> in behavior when it comes to the raising of FE_INVALID exceptions.  This
> patch removes, from the manual, a sentence that states otherwise.

This change is incorrect.  == and != do not raise exceptions except for 
signaling NaNs; ordered comparisons raise exceptions for both quiet and 
signaling NaNs (you can use the is* macros from C99 to avoid exceptions 
for quiet NaNs for ordered comparisons, and iseqsig from TS 18661-1 to get 
exceptions for quiet NaNs for equality comparisons).

-- 
Joseph S. Myers
joseph@codesourcery.com