(rotl[shq]i3, rotl[hq]i3+1): Don't directly modify operand.

From-SVN: r13882

gcc/config/m68k/m68k.md

@@ -4749,7 +4749,7 @@
     return \"swap %0\";
   else if (GET_CODE (operands[2]) == CONST_INT && INTVAL (operands[2]) >= 16)
     {
-      INTVAL (operands[2]) = 32 - INTVAL (operands[2]);
+      operands[2] = gen_rtx (CONST_INT, VOIDmode, 32 - INTVAL (operands[2]));
       return \"ror%.l %2,%0\";
     }
   else
@@ -4765,7 +4765,7 @@
 {
   if (GET_CODE (operands[2]) == CONST_INT && INTVAL (operands[2]) >= 8)
     {
-      INTVAL (operands[2]) = 16 - INTVAL (operands[2]);
+      operands[2] = gen_rtx (CONST_INT, VOIDmode, 16 - INTVAL (operands[2]));
       return \"ror%.w %2,%0\";
     }
   else
@@ -4781,7 +4781,7 @@
 {
   if (GET_CODE (operands[2]) == CONST_INT && INTVAL (operands[2]) >= 8)
     {
-      INTVAL (operands[2]) = 16 - INTVAL (operands[2]);
+      operands[2] = gen_rtx (CONST_INT, VOIDmode, 16 - INTVAL (operands[2]));
       return \"ror%.w %2,%0\";
     }
   else
@@ -4797,7 +4797,7 @@
 {
   if (GET_CODE (operands[2]) == CONST_INT && INTVAL (operands[2]) >= 4)
     {
-      INTVAL (operands[2]) = 8 - INTVAL (operands[2]);
+      operands[2] = gen_rtx (CONST_INT, VOIDmode, 8 - INTVAL (operands[2]));
       return \"ror%.b %2,%0\";
     }
   else
@@ -4813,7 +4813,7 @@
 {
   if (GET_CODE (operands[2]) == CONST_INT && INTVAL (operands[2]) >= 4)
     {
-      INTVAL (operands[2]) = 8 - INTVAL (operands[2]);
+      operands[2] = gen_rtx (CONST_INT, VOIDmode, 8 - INTVAL (operands[2]));
       return \"ror%.b %2,%0\";
     }
   else