Commit b0d63e8d authored by holyfoot/hf@mysql.com/hfmain.(none)'s avatar holyfoot/hf@mysql.com/hfmain.(none)
Browse files

Bug #29085 A small double precision number becomes zero. 

Denormalized DOUBLE-s can't be properly handled by old MIPS processors.
So we need to enable specific mode for them so IRIX will do use
software round to handle such numbers.
parent 366a87cd

sql/mysqld.cc

+17 −3
Original line number Diff line number Diff line
@@ -193,7 +193,7 @@ typedef fp_except fp_except_t; 
     this on freebsd

  */



inline void reset_floating_point_exceptions()

inline void set_proper_floating_point_mode()

{

  /* Don't fall for overflow, underflow,divide-by-zero or loss of precision */

#if defined(__i386__)
@@ -204,8 +204,22 @@ inline void reset_floating_point_exceptions() 
	     FP_X_IMP));

#endif

}

#elif defined(__sgi)

/* for IRIX to use set_fpc_csr() */

#include <sys/fpu.h>



inline void set_proper_floating_point_mode()

{

  /* Enable denormalized DOUBLE values support for IRIX */

  {

    union fpc_csr n;

    n.fc_word = get_fpc_csr();

    n.fc_struct.flush = 0;

    set_fpc_csr(n.fc_word);

  }

}

#else

#define reset_floating_point_exceptions()

#define set_proper_floating_point_mode()

#endif /* __FreeBSD__ && HAVE_IEEEFP_H */



} /* cplusplus */
@@ -2876,7 +2890,7 @@ static int init_server_components() 
  query_cache_init();

  query_cache_resize(query_cache_size);

  randominit(&sql_rand,(ulong) start_time,(ulong) start_time/2);

  reset_floating_point_exceptions();

  set_proper_floating_point_mode();

  init_thr_lock();

#ifdef HAVE_REPLICATION

  init_slave_list();