On 03/04/2016 04:55 PM, Bernd Schmidt wrote:
This is a problem I ran into before, although I can't remember the
details. The problem here is that a user program requests an
unreasonably large vector, the default_vector_alignment returns an
unreasonably large alignment in a HOST_WIDE_INT, which then gets stored
int TYPE_ALIGN, which is an int. Therefore TYPE_ALIGN becomes zero,
smaller than the type size, and we abort.
It seems misguided not to restrict alignments much more drastically in
this hook, but for now I chose what I think is a conservative fix:
limiting alignments to MAX_OFILE_ALIGNMENT.
Bootstrapped and tested on x86_64-linux. Ok?
Bernd
valign.diff
PR c/69973
* targhooks.c (default_vector_alignment): Limit to MAX_OFILE_ALIGNMENT.
testsuite/
PR c/69973
* gcc.dg/pr69973.c: New test.
This is safe enough that even though it's not a regression I think it's
fine for gcc-6.
I'll commit to the trunk momentarily.
jeff
