https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80293
--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> That said, the array cases we've seen are somewhat disturbing...
Cases? Can you point me to the other ones, please? What type do they
have?
> maybe we can disable total scalarization for those?
The support for total scalarization of arrays was added by Alan
Lawrence as a part of constant pool SRA and I suppose that for a good
reason (the added testcases have them at least).
However, thinking about this particular testcase a bit more, I think
the most reasonable thing to do is to disable total scalarization of
char (or generally byte-sized-element) arrays. Those are likely just
some anonymous storage anyway:
diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c
index 02453d3ed9a..cbe9e862a2f 100644
--- a/gcc/tree-sra.c
+++ b/gcc/tree-sra.c
@@ -981,7 +981,7 @@ scalarizable_type_p (tree type)
if (TYPE_DOMAIN (type) == NULL_TREE
|| !tree_fits_shwi_p (TYPE_SIZE (type))
|| !tree_fits_shwi_p (TYPE_SIZE (TREE_TYPE (type)))
- || (tree_to_shwi (TYPE_SIZE (TREE_TYPE (type))) <= 0)
+ || (tree_to_shwi (TYPE_SIZE (TREE_TYPE (type))) <= BITS_PER_UNIT)
|| !tree_fits_shwi_p (TYPE_MIN_VALUE (TYPE_DOMAIN (type))))
return false;
if (tree_to_shwi (TYPE_SIZE (type)) == 0
