Commit 23e402bf authored by unknown's avatar unknown

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. 


sql/mysqld.cc:
  Bug #29085 A small double precision number becomes zero.
  
  reset_floating_point_exeption() renamed as set_proper_floating_point_mode()
  #ifdef __sgi code added to enable denormalized DOUBLE-s on IRIX
parent 5d385571
...@@ -193,7 +193,7 @@ typedef fp_except fp_except_t; ...@@ -193,7 +193,7 @@ typedef fp_except fp_except_t;
this on freebsd 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 */ /* Don't fall for overflow, underflow,divide-by-zero or loss of precision */
#if defined(__i386__) #if defined(__i386__)
...@@ -204,8 +204,22 @@ inline void reset_floating_point_exceptions() ...@@ -204,8 +204,22 @@ inline void reset_floating_point_exceptions()
FP_X_IMP)); FP_X_IMP));
#endif #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 #else
#define reset_floating_point_exceptions() #define set_proper_floating_point_mode()
#endif /* __FreeBSD__ && HAVE_IEEEFP_H */ #endif /* __FreeBSD__ && HAVE_IEEEFP_H */
} /* cplusplus */ } /* cplusplus */
...@@ -2876,7 +2890,7 @@ static int init_server_components() ...@@ -2876,7 +2890,7 @@ static int init_server_components()
query_cache_init(); query_cache_init();
query_cache_resize(query_cache_size); query_cache_resize(query_cache_size);
randominit(&sql_rand,(ulong) start_time,(ulong) start_time/2); randominit(&sql_rand,(ulong) start_time,(ulong) start_time/2);
reset_floating_point_exceptions(); set_proper_floating_point_mode();
init_thr_lock(); init_thr_lock();
#ifdef HAVE_REPLICATION #ifdef HAVE_REPLICATION
init_slave_list(); init_slave_list();
......
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