bk commit into 4.1 tree (holyfoot:1.2698) BUG#29085

[holyfoot]

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ChangeSet@stripped, 2007-11-28 18:58:20+04:00, holyfoot@stripped +1 -0
  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@stripped, 2007-11-28 18:58:19+04:00, holyfoot@stripped +15 -0
    Bug #29085 A small double precision number becomes zero.
    
    #ifdef __sgi code added to enable denormalized DOUBLE-s on IRIX

diff -Nrup a/sql/mysqld.cc b/sql/mysqld.cc
--- a/sql/mysqld.cc	2007-03-24 16:03:25 +04:00
+++ b/sql/mysqld.cc	2007-11-28 18:58:19 +04:00
@@ -189,6 +189,11 @@ int initgroups(const char *,unsigned int
 typedef fp_except fp_except_t;
 #endif
 
+/* for IRIX to use set_fpc_csr() */
+#ifdef __sgi
+#include <sys/fpu.h>
+#endif /*__sgi*/
+
   /* We can't handle floating point exceptions with threads, so disable
      this on freebsd
   */
@@ -3154,6 +3159,16 @@ int main(int argc, char **argv)
   DEBUGGER_OFF;
 
   MY_INIT(argv[0]);		// init my_sys library & pthreads
+
+  /* Enable denormalized DOUBLE values support for IRIX */
+#ifdef __sgi
+  {
+    union fpc_csr n;
+    n.fc_word = get_fpc_csr();
+    n.fc_struct.flush = 0;
+    set_fpc_csr(n.fc_word);
+  }
+#endif /*__sgi*/
 
   /* Set signal used to kill MySQL */
 #if defined(SIGUSR2)