https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83338
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-08
CC| |jakub at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I believe the bug is that get_vectype_for_scalar_type for the operands of
POINTER_DIFF_EXPR is vector of unsigned elements, the result of
POINTER_DIFF_EXPR is a signed and thus we IMHO need to vectorize
POINTER_DIFF_EXPR as effectively MINUS_EXPR on the vector unsigned operands
producing vector unsigned result, and then VIEW_CONVERT_EXPR the result into
vector signed result. The reason POINTER_PLUS_EXPR works by being mapped as
PLUS_EXPR is that both sizetype and pointers are TYPE_UNSIGNED and we get the
same vector types for both.
