2008-07-06 15:10:32 +00:00
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.\" Written Sat Mar 8 10:35:08 MEZ 1997 by
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.\" J. "MUFTI" Scheurich (mufti@csv.ica.uni-stuttgart.de)
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2006-06-01 20:30:30 +00:00
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.\" This page is licensed under the GNU General Public License
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.\"
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2007-05-18 09:55:10 +00:00
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.TH __SETFPUCW 3 1997-03-08 "Linux" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2007-06-16 07:34:33 +00:00
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__setfpucw \- set FPU control word on i386 architecture (obsolete)
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2004-11-03 13:51:07 +00:00
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.SH SYNOPSIS
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.B #include <i386/fpu_control.h>
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.sp
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2007-07-13 08:45:03 +00:00
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.BI "void __setfpucw(unsigned short " control_word );
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2004-11-03 13:51:07 +00:00
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.SH DESCRIPTION
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2005-10-19 06:54:38 +00:00
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.BR __setfpucw ()
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transfers
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2007-04-12 22:42:49 +00:00
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.I control_word
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2008-07-23 02:57:20 +00:00
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to the registers of the FPU (floating-point unit) on the i386 architecture.
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This was used to control floating-point precision,
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rounding and floating-point exceptions.
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2007-07-18 20:25:46 +00:00
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.SH CONFORMING TO
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accept.2, execve.2, futimesat.2, getresuid.2, getrlimit.2, madvise.2, mq_getsetattr.2, msgctl.2, nice.2, open.2, poll.2, setresuid.2, shmctl.2, sigaction.2, times.2, utimensat.2, __setfpucw.3, atoi.3, endian.3, err.3, euidaccess.3, fenv.3, fopencookie.3, fpurge.3, getgrouplist.3, getutmp.3, j0.3, lgamma.3, netlink.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_cleanup_push_defer_np.3, pthread_getattr_np.3, pthread_kill_other_threads_np.3, pthread_setaffinity_np.3, pthread_tryjoin_np.3, pthread_yield.3, random_r.3, readdir.3, rtnetlink.3, scanf.3, setenv.3, significand.3, sigsetops.3, strerror.3, strstr.3, sysv_signal.3, termios.3, timegm.3, unlocked_stdio.3, y0.3, locale.5, bootparam.7, feature_test_macros.7, ip.7, locale.7, pthreads.7, rtld-audit.7, nscd.8: Global fix: s/non-standard/nonstandard/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:37:52 +00:00
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This function was a nonstandard GNU extension.
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2007-06-16 07:34:33 +00:00
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.SH NOTES
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2004-11-03 13:51:07 +00:00
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As of glibc 2.1 this function does not exist anymore.
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2006-08-03 13:57:30 +00:00
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There are new functions from C99, with prototypes in
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2007-12-10 07:08:12 +00:00
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.IR <fenv.h> ,
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2007-06-16 07:34:33 +00:00
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to control FPU rounding modes, like
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2004-11-03 13:51:07 +00:00
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.IR fegetround ,
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.IR fesetround ,
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and the floating-point environment, like
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.IR fegetenv ,
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.IR feholdexcept ,
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.IR fesetenv ,
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2007-09-20 16:26:31 +00:00
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.I feupdateenv
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2007-06-16 07:34:33 +00:00
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and FPU exception handling, like
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2004-11-03 13:51:07 +00:00
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.IR feclearexcept ,
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.IR fegetexceptflag ,
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.IR feraiseexcept ,
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.IR fesetexceptflag ,
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.IR fetestexcept .
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.PP
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2007-12-16 13:39:24 +00:00
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If direct access to the FPU control word is still needed, the
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.B _FPU_GETCW
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and
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.B _FPU_SETCW
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macros from
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2007-12-10 07:08:12 +00:00
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.I <fpu_control.h>
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can be used.
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2007-05-19 04:30:20 +00:00
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.SH EXAMPLE
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2007-09-20 16:26:31 +00:00
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.B __setfpucw(0x1372)
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2007-05-19 04:30:20 +00:00
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2007-06-16 07:34:33 +00:00
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Set FPU control word on the i386 architecture to
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2007-05-19 04:30:20 +00:00
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.br
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\- extended precision
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.br
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\- rounding to nearest
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.br
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\- exceptions on overflow, zero divide and NaN
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.SH "SEE ALSO"
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.BR feclearexcept (3)
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.br
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2007-12-10 07:08:12 +00:00
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.I <fpu_control.h>
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