pdp11.md (define_c_enum "unspecv"): New.

	* config/pdp11/pdp11.md (define_c_enum "unspecv"): New.
	(prologue, epilogue): New.
	(return, *rts): New.
	(blockage, setd, seti): New.
	* config/pdp11/pdp11.c (TARGET_ASM_FUNCTION_PROLOGUE): Remove.
	(TARGET_ASM_FUNCTION_EPILOGUE): Remove.
	(pdp11_saved_regno): New.
	(pdp11_expand_prologue): Rename from pdp11_output_function_prologue;
	generate rtl instead of text.
	(pdp11_expand_epilogue): Similarly from pdp11_output_function_epilogue.
	(pdp11_sp_frame_offset): Export.  Use pdp11_saved_regno.
	* config/pdp11/pdp11-protos.h: Update.

From-SVN: r176082

gcc/ChangeLog

 2011-07-09  Richard Henderson  <rth@redhat.com>
 
+	* config/pdp11/pdp11.md (define_c_enum "unspecv"): New.
+	(prologue, epilogue): New.
+	(return, *rts): New.
+	(blockage, setd, seti): New.
+	* config/pdp11/pdp11.c (TARGET_ASM_FUNCTION_PROLOGUE): Remove.
+	(TARGET_ASM_FUNCTION_EPILOGUE): Remove.
+	(pdp11_saved_regno): New.
+	(pdp11_expand_prologue): Rename from pdp11_output_function_prologue;
+	generate rtl instead of text.
+	(pdp11_expand_epilogue): Similarly from pdp11_output_function_epilogue.
+	(pdp11_sp_frame_offset): Export.  Use pdp11_saved_regno.
+	* config/pdp11/pdp11-protos.h: Update.
+
+2011-07-09  Richard Henderson  <rth@redhat.com>
+
 	* config/rs6000/rs6000.c (rs6000_output_function_prologue): Don't
 	try to insert an rtl prologue here.
 	(rs6000_output_function_epilogue): Similarly.

gcc/config/pdp11/pdp11-protos.h

@@ -38,6 +38,7 @@ typedef enum { no_action, dec_before, inc_after } pdp11_action;
 typedef enum { little, either, big } pdp11_partorder;
 extern bool pdp11_expand_operands (rtx *, rtx [][2], int, 
 				   pdp11_action *, pdp11_partorder);
+extern int pdp11_sp_frame_offset (void);
 extern int pdp11_initial_elimination_offset (int, int);
 extern enum reg_class pdp11_regno_reg_class (int);
 
@@ -45,3 +46,5 @@ extern enum reg_class pdp11_regno_reg_class (int);
 
 extern void output_ascii (FILE *, const char *, int);
 extern void pdp11_asm_output_var (FILE *, const char *, int, int, bool);
+extern void pdp11_expand_prologue (void);
+extern void pdp11_expand_epilogue (void);

gcc/config/pdp11/pdp11.md

@@ -22,6 +22,13 @@
 (include "predicates.md")
 (include "constraints.md")
 
+(define_c_enum "unspecv"
+  [
+    UNSPECV_BLOCKAGE
+    UNSPECV_SETD
+    UNSPECV_SETI
+  ])
+
 (define_constants
   [
    ;; Register numbers
@@ -104,6 +111,50 @@
 
 ;; define function units
 
+;; Prologue and epilogue support.
+
+(define_expand "prologue"
+  [(const_int 0)]
+  ""
+{
+  pdp11_expand_prologue ();
+  DONE;
+})
+
+(define_expand "epilogue"
+  [(const_int 0)]
+  ""
+{
+  pdp11_expand_epilogue ();
+  DONE;
+})
+
+(define_expand "return"
+  [(return)]
+  "reload_completed && !frame_pointer_needed && pdp11_sp_frame_offset () == 0"
+  "")
+
+(define_insn "*rts"
+  [(return)]
+  ""
+  "rts pc")
+
+(define_insn "blockage"
+  [(unspec_volatile [(const_int 0)] UNSPECV_BLOCKAGE)]
+  ""
+  ""
+  [(set_attr "length" "0")])
+
+(define_insn "setd"
+  [(unspec_volatile [(const_int 0)] UNSPECV_SETD)]
+  ""
+  "setd")
+
+(define_insn "seti"
+  [(unspec_volatile [(const_int 0)] UNSPECV_SETI)]
+  ""
+  "seti")
+
 ;; arithmetic - values here immediately when next insn issued
 ;; or does it mean the number of cycles after this insn was issued?
 ;; how do I say that fpu insns use cpu also? (pre-interaction phase)