[Bug middle-end/65315] incorrect alignment of local variable with aligned attribute

["sje at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65315

--- Comment #1 from Steve Ellcey <sje at gcc dot gnu.org> ---
It might be easier to see this bug if you apply this patch:

diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c
index 7dfe1f6..7beb00e 100644
--- a/gcc/cfgexpand.c
+++ b/gcc/cfgexpand.c
@@ -973,6 +973,8 @@ expand_stack_vars (bool (*pred) (size_t), struct sta
ck_vars_data *data)
       i = stack_vars_sorted[si];
       alignb = stack_vars[i].alignb;

+      gcc_assert (alignb*BITS_PER_UNIT <= large_align);
+
       /* Stop when we get to the first decl with "small" alignment.  */
       if (alignb * BITS_PER_UNIT <= MAX_SUPPORTED_STACK_ALIGNMENT)
         break;


This way you get an ICE instead of just incorrectly aligned vectors.