Tweak moxie prologue and epilogue code.

From-SVN: r149163

gcc/ChangeLog

+2009-07-01  Anthony Green  <green@moxielogic.com>
+
+	* config/moxie/moxie.c (moxie_expand_prologue): Use dec
+	instruction when possible.
+	(moxie_expand_prologue): Ditto.  Also, save an instruction and
+	some complexity by popping off of $r12 instead of $sp.  
+	* config/moxie/moxie.md (movsi_pop): Don't assume $sp.  Take two
+	operands.
+	
 2009-07-01  Richard Henderson  <rth@redhat.com>
 
 	PR bootstrap/40347

gcc/config/moxie/moxie.c

@@ -273,8 +273,18 @@ moxie_expand_prologue (void)
 
   if (cfun->machine->size_for_adjusting_sp > 0)
     {
+      if (cfun->machine->size_for_adjusting_sp <= 255)
+	{
+	  insn = emit_insn (gen_subsi3 (stack_pointer_rtx, 
+					stack_pointer_rtx, 
+					GEN_INT (cfun->machine->size_for_adjusting_sp)));
+	  RTX_FRAME_RELATED_P (insn) = 1;
+	}
+      else
+	{
 	  insn = 
-	emit_insn (gen_movsi (gen_rtx_REG (Pmode, MOXIE_R12), 
+	    emit_insn (gen_movsi 
+		       (gen_rtx_REG (Pmode, MOXIE_R12), 
 			GEN_INT (-cfun->machine->size_for_adjusting_sp)));
 	  RTX_FRAME_RELATED_P (insn) = 1;
 	  insn = emit_insn (gen_addsi3 (stack_pointer_rtx, 
@@ -282,6 +292,7 @@ moxie_expand_prologue (void)
 					gen_rtx_REG (Pmode, MOXIE_R12)));
 	  RTX_FRAME_RELATED_P (insn) = 1;
 	}	
+    }
 }
 
 void
@@ -293,26 +304,25 @@ moxie_expand_epilogue (void)
   if (cfun->machine->callee_saved_reg_size != 0)
     {
       reg = gen_rtx_REG (Pmode, MOXIE_R12);
+      if (cfun->machine->callee_saved_reg_size <= 255)
+	{
+	  emit_move_insn (reg, hard_frame_pointer_rtx);
+	  emit_insn (gen_subsi3 
+		     (reg, reg, 
+		      GEN_INT (cfun->machine->callee_saved_reg_size)));
+	}
+      else
+	{
 	  emit_move_insn (reg,
 			  GEN_INT (-cfun->machine->callee_saved_reg_size));
 	  emit_insn (gen_addsi3 (reg, reg, hard_frame_pointer_rtx));
-      insn = emit_move_insn (stack_pointer_rtx, reg);
-      RTX_FRAME_RELATED_P (insn) = 1;
-      add_reg_note (insn, REG_CFA_DEF_CFA,
-		    plus_constant (stack_pointer_rtx,
-				   cfun->machine->callee_saved_reg_size));
+	}
       for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0; )
 	if (!fixed_regs[regno] && !call_used_regs[regno]
 	    && df_regs_ever_live_p (regno))
 	  {
-	    reg = gen_rtx_REG (Pmode, regno);
-	    insn = emit_insn (gen_movsi_pop (reg));
-	    RTX_FRAME_RELATED_P (insn) = 1;
-	    add_reg_note (insn, REG_CFA_ADJUST_CFA,
-			  gen_rtx_SET (VOIDmode, stack_pointer_rtx,
-				       plus_constant (stack_pointer_rtx,
-						      UNITS_PER_WORD)));
-	    add_reg_note (insn, REG_CFA_RESTORE, reg);
+	    rtx preg = gen_rtx_REG (Pmode, regno);
+	    insn = emit_insn (gen_movsi_pop (reg, preg));
 	  }
     }
 

gcc/config/moxie/moxie.md

@@ -195,10 +195,10 @@
 
 ;; Pop a register from the stack
 (define_insn "movsi_pop"
-  [(set:SI (match_operand:SI 0 "register_operand" "=r")
-	(mem:SI (post_inc:SI (reg:SI 1))))]
+  [(set:SI (match_operand:SI 1 "register_operand" "=r")
+	(mem:SI (post_inc:SI (match_operand:SI 0 "register_operand" "r"))))]
   ""
-  "pop    $sp, %0")
+  "pop    %0, %1")
 
 (define_expand "movsi"
    [(set (match_operand:SI 0 "general_operand" "")