mn10300.c (expand_epilogue): Correctly handle functions with large frames, but…

mn10300.c (expand_epilogue): Correctly handle functions with large frames, but no callee register saves.

        * mn10300/mn10300.c (expand_epilogue): Correctly handle functions
        with large frames, but no callee register saves.

        * mn10300/mn1300.md (movdf, movdi): Handle overlapping moves.

From-SVN: r13757

gcc/config/mn10300/mn10300.md

@@ -183,18 +183,47 @@
 	(match_operand:DI 1 "general_operand" "0,0,I,d,a,d,a,dim,aim,dim,aim"))]
   "register_operand (operands[0], DImode)
    || register_operand (operands[1], DImode)"
-  "@
-  nop
-  nop
-  clr %L0\;clr %H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0"
+  "*
+{
+  switch (which_alternative)
+    {
+      case 0:
+      case 1:
+	return \"nop\";
+
+      case 2:
+	return \"clr %L0\;clr %H0\";
+
+      case 3:
+      case 4:
+      case 5:
+      case 6:
+      case 7:
+      case 8:
+      case 9:
+      case 10:
+	if (GET_CODE (operands[1]) == MEM
+	    && reg_overlap_mentioned_p (operands[0], XEXP (operands[1], 0)))
+	  {
+	    rtx temp = operands[0];
+
+	    while (GET_CODE (temp) == SUBREG)
+	      temp = SUBREG_REG (temp);
+
+	    if (GET_CODE (temp) != REG)
+	      abort ();
+
+	    if (reg_overlap_mentioned_p (gen_rtx (REG, SImode, REGNO (temp)),
+					 XEXP (operands[1], 0)))
+	      return \"mov %H1,%H0\;mov %L1,%L0\";
+	    else
+	      return \"mov %L1,%L0\;mov %H1,%H0\";
+	      
+	  }
+	else
+	  return \"mov %L1,%L0\;mov %H1,%H0\";
+    }
+}"
   [(set_attr "cc" "none,none,clobber,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit")])
 
 (define_expand "movdf"
@@ -214,18 +243,47 @@
 	(match_operand:DF 1 "general_operand" "0,0,G,d,a,d,a,dim,aim,dim,aim"))]
   "register_operand (operands[0], DFmode)
    || register_operand (operands[1], DFmode)"
-  "@
-  nop
-  nop
-  clr %L0\;clr %H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0
-  mov %L1,%L0\;mov %H1,%H0"
+  "*
+{
+  switch (which_alternative)
+    {
+      case 0:
+      case 1:
+	return \"nop\";
+
+      case 2:
+	return \"clr %L0\;clr %H0\";
+
+      case 3:
+      case 4:
+      case 5:
+      case 6:
+      case 7:
+      case 8:
+      case 9:
+      case 10:
+	if (GET_CODE (operands[1]) == MEM
+	    && reg_overlap_mentioned_p (operands[0], XEXP (operands[1], 0)))
+	  {
+	    rtx temp = operands[0];
+
+	    while (GET_CODE (temp) == SUBREG)
+	      temp = SUBREG_REG (temp);
+
+	    if (GET_CODE (temp) != REG)
+	      abort ();
+
+	    if (reg_overlap_mentioned_p (gen_rtx (REG, SImode, REGNO (temp)),
+					 XEXP (operands[1], 0)))
+	      return \"mov %H1,%H0\;mov %L1,%L0\";
+	    else
+	      return \"mov %L1,%L0\;mov %H1,%H0\";
+	      
+	  }
+	else
+	  return \"mov %L1,%L0\;mov %H1,%H0\";
+    }
+}"
   [(set_attr "cc" "none,none,clobber,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit,none_0hit")])