http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59898
Bug ID: 59898
Summary: alignment problems in std::map with avx/avx2
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ignat at gmx dot net
Created attachment 31904
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31904&action=edit
avx_bug.cc
The following code segfaults when compiled with -mavx or -mavx2 on g++ (Debian
4.7.2-5) 4.7.2 on Linux x86_64 (Xeon(R) CPU E3-1240 v3). This also applies to
unordered_map and can also happen when assigning to iterators when it->second
is a 32-byte vector type.
#include <map>
typedef int vec256_t __attribute__ ((__vector_size__ (32)));
std::map<int,vec256_t> m;
int main() {
vec256_t v;
m[0]=v;
return 0;
}
reproduce with:
$ g++ avx_bug.cc -o avx_bug -mavx2 && ./avx_bug
Segmentation fault
thx
ignatius
