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Fix for bug #15936: "round" differs on Windows to Unix

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Both of our own implementations of rint(3) were inconsistent with the
most common behavior of rint() on those platforms that have it: round
to nearest, break ties by rounding to nearest even.

Fixed by leaving just one implementation of rint() in our source tree,
and changing its behavior to match the most common native
implementations on other platforms.

configure.in:
  Added checks for fenv.h and fesetround().
include/config-win.h:
  Removed the incorrect implementation of rint() for Windows.
include/my_global.h:
  Added an rint() implementation for platforms that do not have it.
mysql-test/r/func_math.result:
  Added a test case for bug #15936.
mysql-test/t/func_math.test:
  Added a test case for bug #15936.
sql/mysqld.cc:
  Explicitly set the FPU rounding mode with fesetround().
This commit is contained in:
Alexey Kopytov 2009-02-23 14:28:26 +02:00
commit 0e62c9aa63
6 changed files with 113 additions and 36 deletions
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4
configure.in
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@ -825,7 +825,7 @@ AC_TYPE_SIZE_T
AC_HEADER_DIRENT
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(fcntl.h float.h floatingpoint.h ieeefp.h limits.h \
AC_CHECK_HEADERS(fcntl.h fenv.h float.h floatingpoint.h ieeefp.h limits.h \
memory.h pwd.h select.h \
stdlib.h stddef.h \
strings.h string.h synch.h sys/mman.h sys/socket.h netinet/in.h arpa/inet.h \
@ -2060,7 +2060,7 @@ AC_FUNC_UTIME_NULL
AC_FUNC_VPRINTF
AC_CHECK_FUNCS(alarm bcmp bfill bmove bzero chsize cuserid fchmod fcntl \
fconvert fdatasync finite fpresetsticky fpsetmask fsync ftruncate \
fconvert fdatasync fesetround finite fpresetsticky fpsetmask fsync ftruncate \
getcwd gethostbyaddr_r gethostbyname_r getpass getpassphrase getpwnam \
getpwuid getrlimit getrusage getwd gmtime_r index initgroups isnan \
localtime_r locking longjmp lrand48 madvise mallinfo memcpy memmove \