[Bug c++/58772] New: __attribute__((aligned(16))) and nested classes cause -ftree-vectorize to generate segfaulting code

[roothorick at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58772

            Bug ID: 58772
           Summary: __attribute__((aligned(16))) and nested classes cause
                    -ftree-vectorize to generate segfaulting code
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roothorick at gmail dot com

Created attachment 31027
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31027&action=edit
Testcase for the bug

Compile the attached code with:

g++ -m32 -O1 -msse2 -ftree-vectorize

It will segfault when run.

Any of the following will remove the segfault:

* Removing -m32 (that is, compiling for x86-64)
* Removing -msse2 (presumably because -ftree-vectorize no longer has an
instruction to vectorize with)
* Removing -ftree-vectorize (presumably the source of the bug)
* Changing __attribute__((aligned(16))) to 32, or removing it entirely.

I do not know if the testcase is in the most reduced form; I just kept adding
things until it did what I saw happening in my (much larger, ~300kLOC)
codebase.