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Diffstat (limited to 'man3/__setfpucw.3')
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diff --git a/man3/__setfpucw.3 b/man3/__setfpucw.3 new file mode 100644 index 0000000..161bbf9 --- /dev/null +++ b/man3/__setfpucw.3 @@ -0,0 +1,72 @@ +.\" Written Sat Mar 8 10:35:08 MEZ 1997 by +.\" J. "MUFTI" Scheurich (mufti@csv.ica.uni-stuttgart.de) +.\" +.\" SPDX-License-Identifier: GPL-1.0-or-later +.\" +.TH __setfpucw 3 2023-03-30 "Linux man-pages 6.05.01" +.SH NAME +__setfpucw \- set FPU control word on i386 architecture (obsolete) +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <i386/fpu_control.h> +.PP +.BI "[[deprecated]] void __setfpucw(unsigned short " control_word ); +.fi +.SH DESCRIPTION +.BR __setfpucw () +transfers +.I control_word +to the registers of the FPU (floating-point unit) on the i386 architecture. +This was used to control floating-point precision, +rounding and floating-point exceptions. +.SH STANDARDS +GNU. +.SH HISTORY +Removed in glibc 2.1. +.SH NOTES +There are new functions from C99, with prototypes in +.IR <fenv.h> , +to control FPU rounding modes, like +.BR fegetround (3), +.BR fesetround (3), +and the floating-point environment, like +.BR fegetenv (3), +.BR feholdexcept (3), +.BR fesetenv (3), +.BR feupdateenv (3), +and FPU exception handling, like +.BR feclearexcept (3), +.BR fegetexceptflag (3), +.BR feraiseexcept (3), +.BR fesetexceptflag (3), +and +.BR fetestexcept (3). +.PP +If direct access to the FPU control word is still needed, the +.B _FPU_GETCW +and +.B _FPU_SETCW +macros from +.I <fpu_control.h> +can be used. +.SH EXAMPLES +.B __setfpucw(0x1372) +.PP +Set FPU control word on the i386 architecture to +.RS +.PD 0 +.IP \[bu] 3 +extended precision +.IP \[bu] +rounding to nearest +.IP \[bu] +exceptions on overflow, zero divide and NaN +.PD +.RE +.SH SEE ALSO +.BR feclearexcept (3) +.PP +.I <fpu_control.h> |