This is the mail archive of the glibc-bugs@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[Bug math/3976] libm rounding modes do not work correctly for many archs


------- Additional Comments From vincent+libc at vinc17 dot org  2008-10-27 09:33 -------
(In reply to comment #4)
> The functions have defined behavior only in the default rounding mode
> (round-to-even), anything else is undefined behavior and completely programmer's
> fault for calling the functions in those rounding modes.

No, it isn't. There's no undefined behavior there. The C standard says (F.9):
"Whether the functions honor the rounding direction mode is implementation-defined."

So, this just means that an implementation doesn't need to return a result
rounded to the correct direction (this is implementation-defined). Still it
should return an approximate value whatever the rounding direction mode is, and
not behave erratically.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |


http://sourceware.org/bugzilla/show_bug.cgi?id=3976

------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]