bk commit into 6.0 tree (kaa:1.2756)

[Alexey Kopytov]

Below is the list of changes that have just been committed into a local
6.0 repository of kaa. When kaa does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet@stripped, 2007-12-11 12:24:40+03:00, kaa@polly.(none) +1 -0
  Set the FPU precision to 64 bits on 32-bit Windows.

  sql/mysqld.cc@stripped, 2007-12-11 12:24:32+03:00, kaa@polly.(none) +7 -0
    Set the FPU precision to 64 bits on 32-bit Windows.

diff -Nrup a/sql/mysqld.cc b/sql/mysqld.cc
--- a/sql/mysqld.cc	2007-12-10 21:59:20 +03:00
+++ b/sql/mysqld.cc	2007-12-11 12:24:32 +03:00
@@ -192,11 +192,18 @@ inline void setup_fpu()
               FP_X_IMP));
 #endif /* __i386__ */
 #endif /* __FreeBSD__ && HAVE_IEEEFP_H */
+
+  /*
+    x86 (32-bit) requires FPU precision to be explicitly set to 64 bit for
+    portable results of floating point operations
+  */
 #if defined(__i386__) && defined(HAVE_FPU_CONTROL_H) && defined(_FPU_DOUBLE)
   fpu_control_t cw;
   _FPU_GETCW(cw);
   cw= (cw & ~_FPU_EXTENDED) | _FPU_DOUBLE;
   _FPU_SETCW(cw);
+#elif defined(_WIN32) && !defined(_WIN64)
+  _control87(_PC_53, MCW_PC);
 #endif /* __i386__ && HAVE_FPU_CONTROL_H && _FPU_DOUBLE */
 }