On 11/19/2017 04:54 PM, Marc Glisse wrote: > Hello, > > new version, regtested on powerpc64le-unknown-linux-gnu. The front-end > parts are up for review. > > 2017-10-28 Marc Glisse <marc.gli...@inria.fr> > > gcc/c/ > * c-fold.c (c_fully_fold_internal): Handle POINTER_DIFF_EXPR. > * c-typeck.c (pointer_diff): Use POINTER_DIFF_EXPR. > > gcc/c-family/ > * c-pretty-print.c (pp_c_additive_expression, > c_pretty_printer::expression): Handle POINTER_DIFF_EXPR. > > gcc/cp/ > * constexpr.c (cxx_eval_constant_expression, > potential_constant_expression_1): Handle POINTER_DIFF_EXPR. > * cp-gimplify.c (cp_fold): Likewise. > * error.c (dump_expr): Likewise. > * typeck.c (pointer_diff): Use POINTER_DIFF_EXPR. > > gcc/ > * doc/generic.texi: Document POINTER_DIFF_EXPR, update > POINTER_PLUS_EXPR. > * cfgexpand.c (expand_debug_expr): Handle POINTER_DIFF_EXPR. > * expr.c (expand_expr_real_2): Likewise. > * fold-const.c (const_binop, fold_addr_of_array_ref_difference, > fold_binary_loc): Likewise. > * match.pd (X-X, P+(Q-P), &D-P, (P+N)-P, P-(P+N), (P+M)-(P+N), > P-Q==0, -(A-B), X-Z<Y-Z, (X-Z)-(Y-Z), Z-X<Z-Y, (Z-X)-(Z-Y), > (A-B)+(C-A)): New transformations for POINTER_DIFF_EXPR, based on > MINUS_EXPR transformations. > * optabs-tree.c (optab_for_tree_code): Handle POINTER_DIFF_EXPR. > * tree-cfg.c (verify_expr, verify_gimple_assign_binary): Likewise. > * tree-inline.c (estimate_operator_cost): Likewise. > * tree-pretty-print.c (dump_generic_node, op_code_prio, > op_symbol_code): Likewise. > * tree-vect-stmts.c (vectorizable_operation): Likewise. > * vr-values.c (extract_range_from_binary_expr): Likewise. > * varasm.c (initializer_constant_valid_p_1): Likewise. > * tree.def: New tree code POINTER_DIFF_EXPR. > The front-end bits seem very reasonable to me. If the rest is ACK'd then you should consider the full patch ack'd.
jeff
