[Bug other/18665] [3.4/4.0 Regression] -ftrapv borks up simple integer arithmetic

ebotcazou at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Fri Dec 10 20:04:00 GMT 2004


------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-12-10 20:04 -------
> If addvsi3 actually performs addvdi3, that will be most surprising to
> everyone.  I think that's a very bad idea.  Since we are not invoking addvsi3, 
> and I suspect it's impossible to convince the compiler to do so,

After your patch, that's indeed the case.

> I think there's no reason to provide the backward compatibility function at
> all; the symbol was unused and unusable.

Except that, before your patch, the 64-bit compiler was emitting addvsi3 (see
comment #6 by Steven).  So I think we need to provide the symbol.  The question
would then be: should we provide real SImode addition or word_mode addition as
currently?  Strict backwards compatibility would imply the latter.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18665



More information about the Gcc-bugs mailing list