cleanup: ptr_cmp

1. don't cast size_t* to int*
2. remove long obsolete register specifier

mysys/ptr_cmp.c

@@ -88,8 +88,8 @@ qsort2_cmp get_ptr_compare (size_t size)
 
 static int ptr_compare(size_t *compare_length, uchar **a, uchar **b)
 {
-  reg3 int length= *compare_length;
-  reg1 uchar *first,*last;
+  size_t length= *compare_length;
+  uchar *first,*last;
 
   first= *a; last= *b;
   while (--length)
@@ -103,8 +103,8 @@ static int ptr_compare(size_t *compare_length, uchar **a, uchar **b)
 
 static int ptr_compare_0(size_t *compare_length,uchar **a, uchar **b)
 {
-  reg3 int length= *compare_length;
-  reg1 uchar *first,*last;
+  size_t length= *compare_length;
+  uchar *first,*last;
 
   first= *a; last= *b;
  loop:
@@ -124,8 +124,8 @@ static int ptr_compare_0(size_t *compare_length,uchar **a, uchar **b)
 
 static int ptr_compare_1(size_t *compare_length,uchar **a, uchar **b)
 {
-  reg3 int length= *compare_length-1;
-  reg1 uchar *first,*last;
+  size_t length= *compare_length-1;
+  uchar *first,*last;
 
   first= *a+1; last= *b+1;
   cmp(-1);
@@ -145,8 +145,8 @@ static int ptr_compare_1(size_t *compare_length,uchar **a, uchar **b)
 
 static int ptr_compare_2(size_t *compare_length,uchar **a, uchar **b)
 {
-  reg3 int length= *compare_length-2;
-  reg1 uchar *first,*last;
+  size_t length= *compare_length-2;
+  uchar *first,*last;
 
   first= *a +2 ; last= *b +2;
   cmp(-2);
@@ -167,8 +167,8 @@ static int ptr_compare_2(size_t *compare_length,uchar **a, uchar **b)
 
 static int ptr_compare_3(size_t *compare_length,uchar **a, uchar **b)
 {
-  reg3 int length= *compare_length-3;
-  reg1 uchar *first,*last;
+  size_t length= *compare_length-3;
+  uchar *first,*last;
 
   first= *a +3 ; last= *b +3;
   cmp(-3);