------- Comment #10 from dberlin at gcc dot gnu dot org 2009-01-16 21:07
-------
Subject: Re: [4.2/4.3/4.4 Regression] trapping
expression wrongly hoisted out of loop
On Fri, Jan 16, 2009 at 4:01 PM, rguenther at suse dot de
<gcc-bugzi...@gcc.gnu.org> wrote:
>
>
> ------- Comment #9 from rguenther at suse dot de 2009-01-16 21:01 -------
> Subject: Re: [4.2/4.3/4.4 Regression] trapping
> expression wrongly hoisted out of loop
>
> On Fri, 16 Jan 2009, dberlin at dberlin dot org wrote:
>
>> Subject: Re: [4.2/4.3/4.4 Regression] trapping
>> expression wrongly hoisted out of loop
>>
>> Hmmm.
>> The only way you could get the CFG to represent that any call may exit
>> would be to calls terminate bb's and have an edge from every call to
>> exit.
>> :(
>>
>> We actually do this with noreturn edges.
>> It's probably a lot easier to just not move trapping expressions for now.
>
> Like all loads from pointers? :/
>
> I'll try to do something slightly more clever.
Ugh.
What do other compilers do here?
Honestly, if they are just as broken as us, i say we just do nothing.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38819
