dist/gcc/tree-ssa-phiprop.c

160       tree old_arg, new_var;
164       old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e);
166       while (TREE_CODE (old_arg) == SSA_NAME
167 	     && (SSA_NAME_VERSION (old_arg) >= n
168 	         || phivn[SSA_NAME_VERSION (old_arg)].value == NULL_TREE))
170 	  gimple *def_stmt = SSA_NAME_DEF_STMT (old_arg);
171 	  old_arg = gimple_assign_rhs1 (def_stmt);
175       if (TREE_CODE (old_arg) == SSA_NAME)
183 				  phivn[SSA_NAME_VERSION (old_arg)].value);
187 	  new_var = phivn[SSA_NAME_VERSION (old_arg)].value;
192 	  gcc_assert (TREE_CODE (old_arg) == ADDR_EXPR);
197 	  if (!is_gimple_min_invariant (old_arg))
198 	    old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e);
200 	    old_arg = unshare_expr (old_arg);
203 						  old_arg,