+
+ /* Check stack bounds if necessary. */
+ if (current_function_limit_stack)
+ {
+ rtx available;
+ rtx space_available = gen_label_rtx ();
+#ifdef STACK_GROWS_DOWNWARD
+ available = expand_binop (Pmode, sub_optab,
+ stack_pointer_rtx, stack_limit_rtx,
+ NULL_RTX, 1, OPTAB_WIDEN);
+#else
+ available = expand_binop (Pmode, sub_optab,
+ stack_limit_rtx, stack_pointer_rtx,
+ NULL_RTX, 1, OPTAB_WIDEN);
+#endif
+ emit_cmp_and_jump_insns (available, size, GEU, NULL_RTX, Pmode, 1,
+ space_available);
+#ifdef HAVE_trap
+ if (HAVE_trap)
+ emit_insn (gen_trap ());
+ else
+#endif
+ error ("stack limits not supported on this target");
+ emit_barrier ();
+ emit_label (space_available);
+ }
+