https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
Jakub Jelinek changed:
What|Removed |Added
CC||jakub at gcc dot gnu.org
--- Comment #10
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
Markus Trippelsdorf changed:
What|Removed |Added
Status|NEW |RESOLVED
CC|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #8 from rguenther at suse dot de ---
On January 30, 2016 4:10:12 AM GMT+01:00, law at redhat dot com
wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
>
>--- Comment #7 from Jeffrey A. Law ---
>I haven't looked in detail, b
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #7 from Jeffrey A. Law ---
I haven't looked in detail, but presumably we're classifying this as a bug in
Python? Do we want/need to keep this BZ open in GCC itself?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #6 from Richard Biener ---
Ugh, totally insufficient patch. Probably warrants a CVE, I'm sure some of
them we optimized before, like
old_size = sz;
sz += a;
if (sz < old_size)
...
I'll dig further (just look for PyExc_Overflo
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #5 from Richard Biener ---
Created attachment 37519
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37519&action=edit
patch to fix it in two places
Uh, indeed. Looks like those kind of broken overflow checks are everywhere
(wel
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #4 from Jeffrey A. Law ---
I believe it's in replace_substring.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #3 from Richard Biener ---
Ok, makes sense if b and c are signed and thus overflow is undefined. Where's
that code in python?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
--- Comment #2 from Jeffrey A. Law ---
Quick update. It appears that we've got something like this
t = b * c;
r = b / c;
if (r != b)
Which python is using as an overflow check. We now know how to optimize the
mul/div sequence, whic
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
Jeffrey A. Law changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69533
Richard Biener changed:
What|Removed |Added
Target Milestone|--- |6.0
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