[NDS32] Have sibling calls optmization to be performed on nds32 target.

gcc/
	* config/nds32/nds32-protos.h (nds32_expand_epilogue): Change
	prototype.
	(nds32_expand_epilogue_v3pop): Likewise.
	* config/nds32/nds32.md (sibcall): Define this for sibling call
	optimization.
	(sibcall_register): Likewise.
	(sibcall_immediate): Likewise.
	(sibcall_value): Likewise.
	(sibcall_value_register): Likewise.
	(sibcall_value_immediate): Likewise.
	(sibcall_epilogue): Likewise.
	(epilogue): Pass false to indicate this is not a sibcall epilogue.
	* config/nds32/nds32.c (nds32_expand_epilogue): Consider sibcall case.
	(nds32_expand_epilogue_v3pop): Likewise.

From-SVN: r219712

gcc/ChangeLog

 2015-01-16  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32-protos.h (nds32_expand_epilogue): Change
+	prototype.
+	(nds32_expand_epilogue_v3pop): Likewise.
+	* config/nds32/nds32.md (sibcall): Define this for sibling call
+	optimization.
+	(sibcall_register): Likewise.
+	(sibcall_immediate): Likewise.
+	(sibcall_value): Likewise.
+	(sibcall_value_register): Likewise.
+	(sibcall_value_immediate): Likewise.
+	(sibcall_epilogue): Likewise.
+	(epilogue): Pass false to indicate this is not a sibcall epilogue.
+	* config/nds32/nds32.c (nds32_expand_epilogue): Consider sibcall case.
+	(nds32_expand_epilogue_v3pop): Likewise.
+
+2015-01-16  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* config/nds32/nds32-protos.h (nds32_can_use_return_insn): New.
 	* config/nds32/nds32.md (unspec_volatile_func_return): Remove.
 	(return_internal): New.

gcc/config/nds32/nds32-protos.h

@@ -58,9 +58,9 @@ extern void nds32_init_cumulative_args (CUMULATIVE_ARGS *,
 /* -- Function Entry and Exit.  */
 
 extern void nds32_expand_prologue (void);
-extern void nds32_expand_epilogue (void);
+extern void nds32_expand_epilogue (bool);
 extern void nds32_expand_prologue_v3push (void);
-extern void nds32_expand_epilogue_v3pop (void);
+extern void nds32_expand_epilogue_v3pop (bool);
 
 /* ------------------------------------------------------------------------ */
 

gcc/config/nds32/nds32.c

@@ -3044,7 +3044,7 @@ nds32_expand_prologue (void)
 
 /* Function for normal multiple pop epilogue.  */
 void
-nds32_expand_epilogue (void)
+nds32_expand_epilogue (bool sibcall_p)
 {
   int sp_adjust;
   int en4_const;
@@ -3089,7 +3089,8 @@ nds32_expand_epilogue (void)
 
       /* Generate return instruction by using 'return_internal' pattern.
          Make sure this instruction is after gen_blockage().  */
-      emit_jump_insn (gen_return_internal ());
+      if (!sibcall_p)
+	emit_jump_insn (gen_return_internal ());
       return;
     }
 
@@ -3194,7 +3195,8 @@ nds32_expand_epilogue (void)
     }
 
   /* Generate return instruction.  */
-  emit_jump_insn (gen_return_internal ());
+  if (!sibcall_p)
+    emit_jump_insn (gen_return_internal ());
 }
 
 /* Function for v3push prologue.  */
@@ -3327,7 +3329,7 @@ nds32_expand_prologue_v3push (void)
 
 /* Function for v3pop epilogue.  */
 void
-nds32_expand_epilogue_v3pop (void)
+nds32_expand_epilogue_v3pop (bool sibcall_p)
 {
   int sp_adjust;
 
@@ -3348,7 +3350,8 @@ nds32_expand_epilogue_v3pop (void)
     {
       /* Generate return instruction by using 'return_internal' pattern.
          Make sure this instruction is after gen_blockage().  */
-      emit_jump_insn (gen_return_internal ());
+      if (!sibcall_p)
+	emit_jump_insn (gen_return_internal ());
       return;
     }
 

gcc/config/nds32/nds32.md

@@ -1988,6 +1988,102 @@ create_template:
 		      (const_int 4)))])
 
 
+;; ----------------------------------------------------------------------------
+
+;; The sibcall patterns.
+
+;; sibcall
+;; sibcall_register
+;; sibcall_immediate
+
+(define_expand "sibcall"
+  [(parallel [(call (match_operand 0 "memory_operand" "")
+		    (const_int 0))
+	      (clobber (reg:SI TA_REGNUM))
+	      (return)])]
+  ""
+  ""
+)
+
+(define_insn "*sibcall_register"
+  [(parallel [(call (mem (match_operand:SI 0 "register_operand" "r, r"))
+		    (match_operand 1))
+	      (clobber (reg:SI TA_REGNUM))
+	      (return)])]
+  ""
+  "@
+   jr5\t%0
+   jr\t%0"
+  [(set_attr "type"   "branch,branch")
+   (set_attr "length" "     2,     4")])
+
+(define_insn "*sibcall_immediate"
+  [(parallel [(call (mem (match_operand:SI 0 "immediate_operand" "i"))
+		    (match_operand 1))
+	      (clobber (reg:SI TA_REGNUM))
+	      (return)])]
+  ""
+{
+  if (TARGET_CMODEL_LARGE)
+    return "b\t%0";
+  else
+    return "j\t%0";
+}
+  [(set_attr "type"   "branch")
+   (set (attr "length")
+	(if_then_else (match_test "TARGET_CMODEL_LARGE")
+		      (const_int 12)
+		      (const_int 4)))])
+
+;; sibcall_value
+;; sibcall_value_register
+;; sibcall_value_immediate
+
+(define_expand "sibcall_value"
+  [(parallel [(set (match_operand 0)
+		   (call (match_operand 1 "memory_operand" "")
+			 (const_int 0)))
+	      (clobber (reg:SI TA_REGNUM))
+	      (return)])]
+  ""
+  ""
+)
+
+(define_insn "*sibcall_value_register"
+  [(parallel [(set (match_operand 0)
+		   (call (mem (match_operand:SI 1 "register_operand" "r, r"))
+			 (match_operand 2)))
+	      (clobber (reg:SI TA_REGNUM))
+	      (return)])]
+  ""
+  "@
+   jr5\t%1
+   jr\t%1"
+  [(set_attr "type"   "branch,branch")
+   (set_attr "length" "     2,     4")])
+
+(define_insn "*sibcall_value_immediate"
+  [(parallel [(set (match_operand 0)
+		   (call (mem (match_operand:SI 1 "immediate_operand" "i"))
+			 (match_operand 2)))
+	      (clobber (reg:SI TA_REGNUM))
+	      (return)])]
+  ""
+{
+  if (TARGET_CMODEL_LARGE)
+    return "b\t%1";
+  else
+    return "j\t%1";
+}
+  [(set_attr "type"   "branch")
+   (set (attr "length")
+	(if_then_else (match_test "TARGET_CMODEL_LARGE")
+		      (const_int 12)
+		      (const_int 4)))])
+
+
+;; ----------------------------------------------------------------------------
+
 ;; prologue and epilogue.
 
 (define_expand "prologue" [(const_int 0)]
@@ -2014,9 +2110,23 @@ create_template:
   if (TARGET_V3PUSH
       && !nds32_isr_function_p (current_function_decl)
       && (cfun->machine->va_args_size == 0))
-    nds32_expand_epilogue_v3pop ();
+    nds32_expand_epilogue_v3pop (false);
+  else
+    nds32_expand_epilogue (false);
+  DONE;
+})
+
+(define_expand "sibcall_epilogue" [(const_int 0)]
+  ""
+{
+  /* Pass true to indicate that this is sibcall epilogue and
+     exit from a function without the final branch back to the
+     calling function.  */
+  if (TARGET_V3PUSH && !nds32_isr_function_p (current_function_decl))
+    nds32_expand_epilogue_v3pop (true);
   else
-    nds32_expand_epilogue ();
+    nds32_expand_epilogue (true);
+
   DONE;
 })