contrib/gcc/tree-ssa-dce.c

222 #define NECESSARY(stmt)		stmt->common.asm_written_flag
227 mark_stmt_necessary (tree stmt, bool add_to_worklist)
229   gcc_assert (stmt);
230   gcc_assert (!DECL_P (stmt));
232   if (NECESSARY (stmt))
237       fprintf (dump_file, "Marking useful stmt: ");
238       print_generic_stmt (dump_file, stmt, TDF_SLIM);
242   NECESSARY (stmt) = 1;
244     VEC_safe_push (tree, heap, worklist, stmt);
253   tree stmt;
263   stmt = SSA_NAME_DEF_STMT (op);
264   gcc_assert (stmt);
266   if (NECESSARY (stmt)
267       || IS_EMPTY_STMT (stmt)
268       || (phionly && TREE_CODE (stmt) != PHI_NODE))
271   NECESSARY (stmt) = 1;
272   VEC_safe_push (tree, heap, worklist, stmt);
284 mark_stmt_if_obviously_necessary (tree stmt, bool aggressive)
292       && tree_could_throw_p (stmt))
294       mark_stmt_necessary (stmt, true);
303   switch (TREE_CODE (stmt))
308       mark_stmt_necessary (stmt, false);
314       mark_stmt_necessary (stmt, true);
321       if (TREE_SIDE_EFFECTS (stmt))
322 	mark_stmt_necessary (stmt, true);
326       op = get_call_expr_in (stmt);
329 	  mark_stmt_necessary (stmt, true);
336       if (TREE_CODE (TREE_OPERAND (stmt, 0)) == EXC_PTR_EXPR
337 	  || TREE_CODE (TREE_OPERAND (stmt, 0)) == FILTER_EXPR)
339 	  mark_stmt_necessary (stmt, true);
345       gcc_assert (!simple_goto_p (stmt));
346       mark_stmt_necessary (stmt, true);
350       gcc_assert (EDGE_COUNT (bb_for_stmt (stmt)->succs) == 2);
355 	mark_stmt_necessary (stmt, true);
362   ann = stmt_ann (stmt);
367   if (ann->has_volatile_ops || is_ctrl_altering_stmt (stmt))
369       mark_stmt_necessary (stmt, true);
373   if (is_hidden_global_store (stmt))
375       mark_stmt_necessary (stmt, true);
420 	  tree stmt = bsi_stmt (i);
421 	  NECESSARY (stmt) = 0;
422 	  mark_stmt_if_obviously_necessary (stmt, el != NULL);
598 	  tree stmt = bsi_stmt (bsi);
600 	  if (NECESSARY (stmt))
604 	      FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter,