[Bug c++/59898] alignment problems in std::map with avx/avx2

[ignat at gmx dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59898

--- Comment #2 from ignat at gmx dot net ---
(In reply to Jakub Jelinek from comment #1)
> User error.  The standard allocators don't guarantee sufficient alignment
> for the vector types.

OMG, I see. Thx for clarifying. So this means that C++ is incapable of keeping
track of the alignment requirements for its types for dynamic allocation and I
so far merely got lucky with SSE as malloc happens to return 16-byte aligned
pointers on 64-bit Linux. :-(

Now that I know what to look for, I see ad-hoc fixes for this design flaw, ehm,
"feature" all over the place. Oh well, yet another stupid incantation to get
things to work ...

thx

ignatius