CVS: gcc/gcc-3.3/gcc/config/msp430 msp430.c, 1.99.2.4, 1.99.2.5

Update of /cvsroot/mspgcc/gcc/gcc-3.3/gcc/config/msp430
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv9452

Modified Files:
      Tag: MSP430X
	msp430.c 
Log Message:
no registers saved in prologue and no epilogue if function never returns


Index: msp430.c
===================================================================
RCS file: /cvsroot/mspgcc/gcc/gcc-3.3/gcc/config/msp430/msp430.c,v
retrieving revision 1.99.2.4
retrieving revision 1.99.2.5
diff -u -w -d -r1.99.2.4 -r1.99.2.5
--- msp430.c	5 Feb 2009 01:44:44 -0000	1.99.2.4
+++ msp430.c	12 Feb 2009 13:51:42 -0000	1.99.2.5
@@ -23,6 +23,7 @@
 #include "rtl.h"
 #include "regs.h"
 #include "hard-reg-set.h"
+#include "basic-block.h"
 #include "real.h"
 #include "insn-config.h"
 #include "conditions.h"
@@ -83,6 +84,7 @@
 static int msp430_task_function_p PARAMS ((tree func));
 static int signal_function_p PARAMS ((tree func));
 static int wakeup_function_p PARAMS ((tree func));
+static int noreturn_function_p (void);
 static int msp430_num_arg_regs PARAMS ((enum machine_mode mode, tree type));
 static int msp430_critical_function_p PARAMS ((tree func));
 static int msp430_reentrant_function_p PARAMS ((tree func));
@@ -545,6 +547,12 @@
 }
 
 static int
+noreturn_function_p ()
+{
+  return EXIT_BLOCK_PTR->pred == NULL;
+}
+
+static int
 msp430_far_object_p (node)
      tree node;
 {
@@ -555,8 +563,8 @@
   a = lookup_attribute ("far", DECL_ATTRIBUTES (node));
   return a != NULL_TREE;
 }
-/* Encode section information about tree DECL */
   
+/* Encode section information about tree DECL */
 void
 encode_section_info (decl)
      tree decl;
@@ -893,7 +901,6 @@
   int wup = wakeup_function_p (current_function_decl);
   int size = msp430_saved_regs_frame ();
   int fs = get_frame_size ();
-
   if (cfp && ree)
     ree = 0;
 
@@ -927,6 +934,7 @@
   int signal_func_p = signal_function_p (current_function_decl);
   int leaf_func_p = leaf_function_p ();
   int main_p = MAIN_NAME_P (DECL_NAME (current_function_decl));
+  int noreturn_func_p = noreturn_function_p();
   int stack_reserve = 0;
   tree ss = 0;
   rtx x = DECL_RTL (current_function_decl);
@@ -1032,7 +1040,7 @@
     }
   else 
     {
-      if (!tfp)
+      if (!tfp && !noreturn_func_p)
         {
           if (MCU_CORE_X)
             {
@@ -1224,6 +1232,7 @@
   int leaf_func_p = leaf_function_p ();
   int main_p = MAIN_NAME_P (DECL_NAME (current_function_decl));
   int wakeup_func_p = wakeup_function_p (current_function_decl);
+  int noreturn_func_p = noreturn_function_p();
   int cfp = msp430_critical_function_p (current_function_decl);
   int ree = msp430_reentrant_function_p (current_function_decl);
   int save_prologue_p =
@@ -1243,6 +1252,12 @@
       return;
     }
 
+  if ( noreturn_func_p )
+    {
+      fprintf (file, "\n\t/* epilogue: empty, noreturn function*/\n");
+      return;
+    }
+
   if (msp430_naked_function_p (current_function_decl))
     {
       fprintf (file, "\n\t/* epilogue: naked */\n");
@@ -1273,11 +1288,16 @@
       if (size)
         {
 	  fprintf (file, "\tadd\t#%d, r1\n", size);
+          if (size == 1 || size == 2 || size == 4 || size == 8)
+	        epilogue_size += 1;
+          else
+            epilogue_size += 2;
         }
+      if ( !noreturn_func_p )
+        {
       fprintf (file, CHECK_JUMP_SIZE("\tbr\t#%s\n","\tbra\t#%s\n"), msp430_endup);
       epilogue_size += 4;
-      if (size == 1 || size == 2 || size == 4 || size == 8)
-	epilogue_size--;
+        }
     }
   else
     {


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