gcc.dg/pr48616.c segfaults on sparc as of a day or two ago
vectorizable_shift() crashes because op1_vectype is NULL and
we hit this code path:
/* Vector shifted by vector. */
if (!scalar_shift_arg)
{
optab = optab_for_tree_code (code, vectype, optab_vector);
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "vector/vector shift/rotate found.");
=> if (TYPE_MODE (op1_vectype) != TYPE_MODE (vectype))
dt[1] is vect_external_def and slp_node is non-NULL.
Indeed, when the 'dt' arg to vect_is_simple_use_1() is
vect_external_def *vectype will be set to NULL.
And scalar_shift_arg gets set to false because of this loop
check:
if (slp_node)
{
VEC (gimple, heap) *stmts = SLP_TREE_SCALAR_STMTS (slp_node);
gimple slpstmt;
FOR_EACH_VEC_ELT (gimple, stmts, k, slpstmt)
if (!operand_equal_p (gimple_assign_rhs2 (slpstmt), op1, 0))
scalar_shift_arg = false;
}
Indeed, this crashing test was added by this change:
2011-10-28 Jakub Jelinek <ja...@redhat.com>
* tree-vect-stmts.c (vectorizable_shift): Give up if op1 has different
vector mode from vectype's mode.
