(flag_omit_frame_pointer, outer_function_chain: declare.

From-SVN: r12897

diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index bb5901977db153139e261f737061f57304df64a6..f556745fa4e33bc2b8bcc1330790bfacafeca696 100644 (file)
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -2589,6 +2589,32 @@ do {                                                                     \
 } while (0)
 
 \f
+/* Helper macros to decide if the rtl of some instruction
+   will cause problems due to register shortage.  */
+
+/* ??? flags.h is not self-contained */
+extern int flag_omit_frame_pointer;
+/* ??? neither is function.h */
+extern struct function *outer_function_chain;
+/* ??? neither is expr.h */
+extern int current_function_calls_alloca;
+/* ??? No header file for  rtx_equal_function_value_matters */
+extern int rtx_equal_function_value_matters;
+
+#define N_REGS_USED(op) \
+  (GET_CODE (op) == MEM \
+   ? (GET_CODE (XEXP (op, 0)) == PLUS \
+      ? (rtx_varies_p (XEXP (XEXP (op, 0), 0)) \
+         + rtx_varies_p (XEXP (XEXP (op, 0), 1))) \
+      : rtx_varies_p (XEXP (op, 0))) \
+   : (GET_CODE (op) == REG ? HARD_REGNO_NREGS (REGNO (op), GET_MODE (op)) : 0))
+
+#define N_ALLOCATABLE_REGISTERS                                                \
+  (6 - (flag_pic != 0) - (outer_function_chain != 0)                    \
+   + (flag_omit_frame_pointer && ! rtx_equal_function_value_matters     \
+      && ! current_function_calls_alloca))                              \
+\f
+
 /* Functions in i386.c */
 extern void override_options ();
 extern void order_regs_for_local_alloc ();