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  • Committer: Monty Taylor
  • Date: 2009-03-08 23:45:12 UTC
  • mto: (923.2.1 mordred)
  • mto: This revision was merged to the branch mainline in revision 921.
  • Revision ID: mordred@inaugust.com-20090308234512-tqkygxtu1iaig23s
Removed C99 isnan() usage, which allows us to remove the util/math.{cc,h} workarounds. Yay for standards!

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mysys/ptr_cmp.cc
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
 
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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/*
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  get_ptr_compare(len) returns a pointer to a optimal byte-compare function
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  The bytes are compare as unsigned chars.
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  */
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#include <config.h>
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#include <drizzled/internal/my_sys.h>
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#include <assert.h>
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#include <plugin/myisam/myisampack.h>
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namespace drizzled
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{
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namespace internal
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{
 
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#include "mysys_priv.h"
 
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#include <storage/myisam/myisampack.h>
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static int ptr_compare(size_t *compare_length, unsigned char **a, unsigned char **b);
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static int ptr_compare_0(size_t *compare_length, unsigned char **a, unsigned char **b);
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        /*
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          Compare two keys to see which is smaller.
 
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          Compare to keys to see witch is smaller.
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          Loop unrolled to make it quick !!
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        */
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static int ptr_compare(size_t *compare_length, unsigned char **a, unsigned char **b)
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{
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  int length= *compare_length;
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  unsigned char *first,*last;
 
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  register int length= *compare_length;
 
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  register unsigned char *first,*last;
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  first= *a; last= *b;
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  while (--length)
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static int ptr_compare_0(size_t *compare_length,unsigned char **a, unsigned char **b)
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{
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  int length= *compare_length;
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  unsigned char *first,*last;
 
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  register int length= *compare_length;
 
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  register unsigned char *first,*last;
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  first= *a; last= *b;
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 loop:
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static int ptr_compare_1(size_t *compare_length,unsigned char **a, unsigned char **b)
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{
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  int length= *compare_length-1;
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  unsigned char *first,*last;
 
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  register int length= *compare_length-1;
 
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  register unsigned char *first,*last;
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  first= *a+1; last= *b+1;
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  cmp(-1);
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static int ptr_compare_2(size_t *compare_length,unsigned char **a, unsigned char **b)
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{
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  int length= *compare_length-2;
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  unsigned char *first,*last;
 
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  register int length= *compare_length-2;
 
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  register unsigned char *first,*last;
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  first= *a +2 ; last= *b +2;
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  cmp(-2);
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static int ptr_compare_3(size_t *compare_length,unsigned char **a, unsigned char **b)
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{
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  int length= *compare_length-3;
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  unsigned char *first,*last;
 
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  register int length= *compare_length-3;
 
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  register unsigned char *first,*last;
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  first= *a +3 ; last= *b +3;
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  cmp(-3);
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 return pos;
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}
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} /* namespace internal */
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} /* namespace drizzled */