Add documentation for:

- fenv(3)
- feclearexcept(3), fegetexceptflag(3), feraiseexcept(3),
  fesetexceptflag(3), fetestexcept(3)
- fegetround(3), fesetround(3)
- fegetenv(3), feholdexcept(3), fesetenv(3), feupdateenv(3)

Reviewed by:	standards@

4 files changed, 601 insertions, 0 deletions

diff --git a/lib/msun/man/feclearexcept.3 b/lib/msun/man/feclearexcept.3
new file mode 100644
index 0000000..67c4341
--- /dev/null
+++ b/lib/msun/man/feclearexcept.3
@@ -0,0 +1,137 @@
+.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 8, 2004
+.Dt FECLEAREXCEPT 3
+.Os
+.Sh NAME
+.Nm feclearexcept ,
+.Nm fegetexceptflag ,
+.Nm feraiseexcept ,
+.Nm fesetexceptflag ,
+.Nm fetestexcept
+.Nd floating-point exception flag manipulation
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In fenv.h
+.Fd "#pragma STDC FENV_ACCESS ON"
+.Ft int
+.Fn feclearexcept "int excepts"
+.Ft int
+.Fn fegetexceptflag "fexcept_t *flagp" "int excepts"
+.Ft int
+.Fn feraiseexcept "int excepts"
+.Ft int
+.Fn fesetexceptflag "const fexcept_t *flagp" "int excepts"
+.Ft int
+.Fn fetestexcept "int excepts"
+.Sh DESCRIPTION
+The
+.Fn feclearexcept
+routine clears the floating-point exception flags specified by
+.Fa excepts ,
+whereas
+.Fn feraiseexcept
+raises the specified exceptions.
+Raising an exception causes the corresponding flag to be set,
+and a SIGFPE is delivered to the process if the exception is unmasked.
+.Pp
+The
+.Fn fetestexcept
+function determines which flags are currently set, of those specified by
+.Fa excepts .
+.Pp
+The
+.Fn fegetexceptflag
+function stores the state of the exception flags specified in
+.Fa excepts
+in the opaque object pointed to by
+.Fa flagp .
+Similarly,
+.Fn fesetexceptflag
+changes the specified exception flags to reflect the state stored in
+the object pointed to by
+.Fa flagp .
+Note that the flags restored with
+.Fn fesetexceptflag
+must be a (not necessarily proper) subset of the flags recorded by
+a prior call to
+.Fn fegetexceptflag .
+.Pp
+For all of these functions, the possible types of exceptions
+include those described in
+.Xr fenv 3 .
+Some architectures may define other types of floating-point exceptions.
+.Sh IMPLEMENTATION NOTES
+On some architectures, raising an overflow or underflow exception
+also causes an inexact exception to be raised.
+In these cases, the overflow or underflow will be raised first.
+.Pp
+The
+.Fn fegetexceptflag
+and
+.Fn fesetexceptflag
+routines are preferred to
+.Fn fetestexcept
+and
+.Fn feraiseexcept ,
+respectively, for saving and restoring exception flags.
+The latter do not re-raise exceptions and may preserve
+architecture-specific information such as addresses where
+exceptions occurred.
+.Sh RETURN VALUES
+The 
+.Fn feclearexcept ,
+.Fn fegetexceptflag ,
+.Fn feraiseexcept ,
+and
+.Fn fesetexceptflag
+functions return 0 upon success, and non-zero otherwise.
+The
+.Fn fetestexcept
+function returns the bitwise OR of the values of the current exception
+flags that were requested.
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr feholdexcept 3 ,
+.Xr fenv 3 ,
+.Xr feupdateenv 3 ,
+.Xr fpgetsticky 3 ,
+.Xr fpresetsticky 3
+.Sh STANDARDS
+The
+.Fn feclearexcept ,
+.Fn fegetexceptflag ,
+.Fn feraiseexcept ,
+.Fn fesetexceptflag ,
+and
+.Fn fetestexcept
+routines conform to
+.St -isoC-99 .
+.Sh HISTORY
+These functions first appeared in
+.Fx 5.3 .
diff --git a/lib/msun/man/fegetenv.3 b/lib/msun/man/fegetenv.3
new file mode 100644
index 0000000..c99663e
--- /dev/null
+++ b/lib/msun/man/fegetenv.3
@@ -0,0 +1,113 @@
+.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 8, 2004
+.Dt FEGETENV 3
+.Os
+.Sh NAME
+.Nm fegetenv ,
+.Nm feholdexcept ,
+.Nm fesetenv ,
+.Nm feupdateenv
+.Nd floating-point environment save and restore
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In fenv.h
+.Fd "#pragma STDC FENV_ACCESS ON"
+.Ft int
+.Fn fegetenv "fenv_t *envp"
+.Ft int
+.Fn feholdexcept "fenv_t *envp"
+.Ft int
+.Fn fesetenv "const fenv_t *envp"
+.Ft int
+.Fn feupdateenv "const fenv_t *envp"
+.Sh DESCRIPTION
+The floating-point environment includes exception flags and masks, the
+current rounding mode, and other architecture-specific settings.
+However, it does not include the floating-point register file.
+.Pp
+The
+.Fn fegetenv
+function stores the current floating-point environment in the object
+pointed to by
+.Fa envp ,
+whereas
+.Fn feholdexcept
+saves the current environment, then clears all exception flags
+and masks all floating-point exceptions.
+.Pp
+The
+.Fn fesetenv
+function restores a previously saved environment.
+The
+.Fn feupdateenv
+function restores a saved environment as well, but it also
+raises any exceptions that were set in the environment it
+replaces.
+.Pp
+The
+.Fn feholdexcept
+function is often used with
+.Fn feupdateenv
+or
+.Fn fesetenv
+to suppress spurious exceptions that occur as a result of
+intermediate computations.
+An example in
+.Xr fenv 3
+demonstrates how to do this.
+.Sh RETURN VALUES
+The
+.Fn fegetenv ,
+.Fn feholdexcept ,
+.Fn fesetenv ,
+and
+.Fn feupdateenv
+functions return 0 if they succeed, and non-zero otherwise.
+.Sh SEE ALSO
+.Xr feclearexcept 3 ,
+.Xr fenv 3 ,
+.Xr feraiseexcept 3 ,
+.Xr fesetenv 3 ,
+.Xr fetestexcept 3 ,
+.Xr fpgetmask 3 ,
+.Xr fpgetprec 3 ,
+.Xr fpsetmask 3 ,
+.Xr fpsetprec 3
+.Sh STANDARDS
+The
+.Fn fegetenv ,
+.Fn feholdexcept ,
+.Fn fesetenv ,
+and
+.Fn feupdateenv
+functions conform to
+.St -isoC-99 .
+.Sh HISTORY
+These routines first appeared in
+.Fx 5.3 .
diff --git a/lib/msun/man/fegetround.3 b/lib/msun/man/fegetround.3
new file mode 100644
index 0000000..1461c83
--- /dev/null
+++ b/lib/msun/man/fegetround.3
@@ -0,0 +1,85 @@
+.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 8, 2004
+.Dt FEGETROUND 3
+.Os
+.Sh NAME
+.Nm fegetround ,
+.Nm fesetround
+.Nd floating-point rounding control
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In fenv.h
+.Fd "#pragma STDC FENV_ACCESS ON"
+.Ft int
+.Fn fegetround "void"
+.Ft int
+.Fn fesetround "int round"
+.Sh DESCRIPTION
+The
+.Fn fegetround
+function determines the current floating-point rounding mode,
+and the
+.Fn fesetround
+function sets the current rounding mode to
+.Fa round .
+The rounding mode is one of
+.Dv FE_TONEAREST ,
+.Dv FE_DOWNWARD ,
+.Dv FE_UPWARD ,
+or
+.Dv FE_TOWARDZERO ,
+as described in
+.Xr fenv 3 .
+.Sh RETURN VALUES
+The
+.Fn fegetround
+routine returns the current rounding mode.
+The
+.Fn fesetround
+function returns 0 on success and non-zero otherwise;
+however, the present implementation always succeeds.
+.Sh SEE ALSO
+.Xr fenv 3 ,
+.Xr fpgetround 3 ,
+.Xr fpsetround 3
+.Sh STANDARDS
+The
+.Fn fegetround
+and
+.Fn fesetround
+functions conform to
+.St -isoC-99 .
+.Sh HISTORY
+These routines first appeared in
+.Fx 5.3 .
+They supersede the non-standard
+.Xr fpgetround 3
+and
+.Xr fpsetround 3
+functions.
diff --git a/lib/msun/man/fenv.3 b/lib/msun/man/fenv.3
new file mode 100644
index 0000000..336bbc0
--- /dev/null
+++ b/lib/msun/man/fenv.3
@@ -0,0 +1,266 @@
+.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 8, 2004
+.Dt FENV 3
+.Os
+.Sh NAME
+.Nm feclearexcept ,
+.Nm fegetexceptflag ,
+.Nm feraiseexcept ,
+.Nm fesetexceptflag ,
+.Nm fetestexcept ,
+.Nm fegetround ,
+.Nm fesetround ,
+.Nm fegetenv ,
+.Nm feholdexcept ,
+.Nm fesetenv ,
+.Nm feupdateenv
+.Nd floating-point environment control
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In fenv.h
+.Fd "#pragma STDC FENV_ACCESS ON"
+.Ft int
+.Fn feclearexcept "int excepts"
+.Ft int
+.Fn fegetexceptflag "fexcept_t *flagp" "int excepts"
+.Ft int
+.Fn feraiseexcept "int excepts"
+.Ft int
+.Fn fesetexceptflag "const fexcept_t *flagp" "int excepts"
+.Ft int
+.Fn fetestexcept "int excepts"
+.Ft int
+.Fn fegetround "void"
+.Ft int
+.Fn fesetround "int round"
+.Ft int
+.Fn fegetenv "fenv_t *envp"
+.Ft int
+.Fn feholdexcept "fenv_t *envp"
+.Ft int
+.Fn fesetenv "const fenv_t *envp"
+.Ft int
+.Fn feupdateenv "const fenv_t *envp"
+.Sh DESCRIPTION
+The fenv routines manipulate the floating-point environment,
+which includes the exception flags and rounding modes defined in
+.St -ieee754 .
+.Ss Exceptions
+Exception flags are set as side-effects of floating-point arithmetic
+operations and math library routines, and they remain set until
+explicitly cleared.
+The following macros expand to bit flags of type
+.Vt int
+representing the five standard floating-point exceptions.
+.Bl -tag -width ".Dv FE_DIVBYZERO"
+.It Dv "FE_DIVBYZERO"
+A divide-by-zero exception occurs when the program attempts to
+divide a finite non-zero number by zero.
+.It Dv "FE_INEXACT"
+An inexact exception is raised whenever there is a loss of precision
+due to rounding.
+.It Dv "FE_INVALID"
+Invalid operation exceptions occur when a program attempts to
+perform calculations for which there is no reasonable representable
+answer.
+For instance, subtraction of infinities, division of zero by zero,
+ordered comparison involving
+.Na
+s, and taking the square root of a
+negative number are all invalid operations.
+.It Dv "FE_OVERFLOW"
+An overflow exception occurs when the magnitude of the result of a
+computation is too large to fit in the destination type.
+.It Dv "FE_UNDERFLOW"
+Underflow occurs when the result of a computation is too close to zero
+to be represented as a non-zero value in the destination type.
+.El
+.Pp
+Additionally, the
+.Dv FE_ALL_EXCEPT
+macro expands to the bitwise OR of the above flags and any
+architecture-specific flags.
+Combinations of these flags are passed to the
+.Fn feclearexcept ,
+.Fn fegetexceptflag ,
+.Fn feraiseexcept ,
+.Fn fesetexceptflag ,
+and
+.Fn fetestexcept
+functions to clear, save, raise, restore, and examine the
+processor's floating-point exception flags, respectively.
+.Ss Rounding Modes
+.St -ieee754
+specifies four rounding modes.
+These modes control the direction in which results are rounded
+from their exact values in order to fit them into binary
+floating-point variables.
+The four modes correspond with the following symbolic constants.
+.Bl -tag -width ".Dv FE_TOWARDZERO"
+.It Dv "FE_TONEAREST"
+Results are rounded to the closest representable value.
+If the exact result is exactly half way between two representable
+values, the value whose last binary digit is even (zero) is chosen.
+This is the default mode.
+.It Dv "FE_DOWNWARD"
+Results are rounded towards negative \*[If].
+.It Dv "FE_UPWARD"
+Results are rounded towards positive \*[If].
+.It Dv "FE_TOWARDZERO"
+Results are rounded towards zero.
+.El
+.Pp
+The
+.Fn fegetround
+and
+.Fn fesetround
+functions query and set the rounding mode.
+.Ss Environment Control
+The
+.Fn fegetenv
+and
+.Fn fesetenv
+functions save and restore the floating-point environment,
+which includes exception flags, the current exception mask,
+the rounding mode, and possibly other implementation-specific
+state.
+The
+.Fn feholdexcept
+function behaves like
+.Fn fegetenv ,
+but with the additional effect of clearing the exception flags and
+installing a
+.Em non-stop
+mode.
+In non-stop mode, floating-point operations will set exception flags
+as usual, but no
+.Dv SIGFPE
+signals will be generated as a result.
+Non-stop mode is the default, but it may be altered by
+non-standard mechanisms.
+.\" XXX Mention fe[gs]etmask() here after the interface is finalized
+.\" XXX and ready to be officially documented.
+The
+.Fn feupdateenv
+function restores a saved environment similarly to
+.Fn fesetenv ,
+but it also re-raises any floating-point exceptions from the old
+environment.
+.Pp
+The macro
+.Dv FE_DFL_ENV
+expands to a pointer to the default environment.
+.Sh CAVEATS
+The FENV_ACCESS pragma can be enabled with
+.Dl "#pragma STDC FENV_ACCESS ON"
+and disabled with the
+.Dl "#pragma STDC FENV_ACCESS OFF"
+directive.
+This lexically-scoped annotation tells the compiler that the program
+may access the floating-point environment, so optimizations that would
+violate strict IEEE-754 semantics are disabled.
+If execution reaches a block of code for which
+.Dv FENV_ACCESS
+is off, the floating-point environment will become undefined.
+.Sh EXAMPLES
+The following routine computes the square root function.
+It explicitly raises an invalid exception on appropriate inputs using
+.Fn feraiseexcept .
+It also defers inexact exceptions while it computes intermediate
+values, and then it allows an inexact exception to be raised only if
+the final answer is inexact.
+.Bd -literal -offset indent
+#pragma STDC FENV_ACCESS ON
+double sqrt(double n) {
+	double x = 1.0;
+	fenv_t env;
+
+	if (isnan(n) || n < 0.0) {
+		feraiseexcept(FE_INVALID);
+		return (NAN);
+	}
+	if (isinf(n) || n == 0.0)
+		return (n);
+	feholdexcept(&env);
+	while (fabs((x * x) - n) > DBL_EPSILON * 2 * x)
+		x = (x / 2) + (n / (2 * x));
+	if (x * x == n)
+		feclearexcept(FE_INEXACT);
+	feupdateenv(&env);
+	return (x);
+}
+.Ed
+.Sh SEE ALSO
+.Xr cc 1 ,
+.Xr feclearexcept 3 ,
+.Xr fegetenv 3 ,
+.Xr fegetexceptflag 3 ,
+.Xr fegetround 3 ,
+.Xr feholdexcept 3 ,
+.Xr feraiseexcept 3 ,
+.Xr fesetenv 3 ,
+.Xr fesetexceptflag 3 ,
+.Xr fesetround 3 ,
+.Xr fetestexcept 3 ,
+.Xr feupdateenv 3 ,
+.Xr fpgetmask 3 ,
+.Xr fpgetprec 3 ,
+.Xr fpgetsticky 3 ,
+.Xr fpgetround 3 ,
+.Xr fpresetsticky 3 ,
+.Xr fpsetmask 3 ,
+.Xr fpsetprec 3 ,
+.Xr fpsetround 3
+.Sh STANDARDS
+Except as noted below,
+.In fenv.h
+conforms to
+.St -isoC-99 .
+.Sh HISTORY
+The
+.In fenv.h
+header first appeared in
+.Fx 5.3 .
+It supersedes the non-standard routines defined in
+.In ieeefp.h
+and documented in
+.Xr fpgetround 3 .
+.Sh BUGS
+The
+.Dv FENV_ACCESS
+pragma is unimplemented in the system compiler.
+However, non-constant expressions generally produce the correct
+side-effects at low optimization levels.
+.Pp
+On the Alpha platform,
+.Xr cc 1
+must be passed the
+.Fl mieee-with-inexact mfp-rounding-mode=d
+options in order to generate code that has the standard
+side-effects and uses the specified rounding modes.