(extzv, and its recognizer): If width is 32, don't set CC_NOT_NEGATIVE.

If width is variable, clear the CC status.

From-SVN: r5958

gcc/config/m68k/m68k.md

@@ -3961,7 +3961,15 @@
   "TARGET_68020 && TARGET_BITFIELD"
   "*
 {
-  cc_status.flags |= CC_NOT_NEGATIVE;
+  if (GET_CODE (operands[2]) == CONST_INT)
+    {
+      if (INTVAL (operands[2]) != 32)
+	cc_status.flags |= CC_NOT_NEGATIVE;
+    }
+  else
+    {
+      CC_STATUS_INIT;
+    }
   return \"bfextu %1{%b3:%b2},%0\";
 }")
 
@@ -4033,7 +4041,15 @@
   "TARGET_68020 && TARGET_BITFIELD"
   "*
 {
-  cc_status.flags |= CC_NOT_NEGATIVE;
+  if (GET_CODE (operands[2]) == CONST_INT)
+    {
+      if (INTVAL (operands[2]) != 32)
+	cc_status.flags |= CC_NOT_NEGATIVE;
+    }
+  else
+    {
+      CC_STATUS_INIT;
+    }
   return \"bfextu %1{%b3:%b2},%0\";
 }")