nios2-protos.h (nios2_expand_return): Declare.

2015-07-14  Sandra Loosemore  <sandra@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>
	    Chung-Lin Tang  <cltang@codesourcery.com>

	gcc/
	* config/nios2/nios2-protos.h (nios2_expand_return): Declare.
	* config/nios2/nios2.c (struct GTY (()) machine_function): Add
	callee_save_reg_size and uses_anonymous_args fields.
	(nios2_compute_frame_layout): Update for CDX push.n/pop.n usage.
	(nios2_create_cfa_notes): New function.
	(nios2_adjust_stack): New function for adjusting stack.
	(nios2_expand_prologue): Update for CDX push.n/pop.n usage.
	Use nios2_adjust_stack.
	(nios2_expand_epilogue): Likewise.
	(nios2_expand_return): New function.
	(nios2_can_use_return_insn): Update for CDX pop.n usage.
	(nios2_setup_incoming_varargs): Set uses_anonymous_args flag.
	If TARGET_HAS_CDX, defer pushing regs to nios2_expand_prologue.
	* config/nios2/nios2.md (return): Use nios2_expand_return.

Co-Authored-By: Cesar Philippidis <cesar@codesourcery.com>
Co-Authored-By: Chung-Lin Tang <cltang@codesourcery.com>

From-SVN: r225799

gcc/ChangeLog

@@ -2,6 +2,25 @@
 	    Cesar Philippidis  <cesar@codesourcery.com>
 	    Chung-Lin Tang  <cltang@codesourcery.com>
 
+	* config/nios2/nios2-protos.h (nios2_expand_return): Declare.
+	* config/nios2/nios2.c (struct GTY (()) machine_function): Add
+	callee_save_reg_size and uses_anonymous_args fields.
+	(nios2_compute_frame_layout): Update for CDX push.n/pop.n usage.
+	(nios2_create_cfa_notes): New function.
+	(nios2_adjust_stack): New function for adjusting stack.
+	(nios2_expand_prologue): Update for CDX push.n/pop.n usage.
+	Use nios2_adjust_stack.
+	(nios2_expand_epilogue): Likewise.
+	(nios2_expand_return): New function.
+	(nios2_can_use_return_insn): Update for CDX pop.n usage.
+	(nios2_setup_incoming_varargs): Set uses_anonymous_args flag.
+	If TARGET_HAS_CDX, defer pushing regs to nios2_expand_prologue.
+	* config/nios2/nios2.md (return): Use nios2_expand_return.
+
+2015-07-14  Sandra Loosemore  <sandra@codesourcery.com>
+	    Cesar Philippidis  <cesar@codesourcery.com>
+	    Chung-Lin Tang  <cltang@codesourcery.com>
+
 	* config/nios2/predicates.md (pop_operation): New.
 	(ldwm_operation, stwm_operation): New.
 	(nios2_hard_register_operand): New.

gcc/config/nios2/nios2-protos.h

@@ -26,6 +26,7 @@ extern int nios2_initial_elimination_offset (int, int);
 extern int nios2_can_use_return_insn (void);
 extern void nios2_expand_prologue (void);
 extern void nios2_expand_epilogue (bool);
+extern bool nios2_expand_return (void);
 extern void nios2_function_profiler (FILE *, int);
 
 #ifdef RTX_CODE

gcc/config/nios2/nios2.md

@@ -746,7 +746,10 @@
 (define_expand "return"
   [(simple_return)]
   "nios2_can_use_return_insn ()"
-  "")
+{
+  if (nios2_expand_return ())
+    DONE;
+})
 
 (define_insn "simple_return"
   [(simple_return)]