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g77.texi (Floating-point Exception Handling): Use feenableexcept in example.

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* g77.texi (Floating-point Exception Handling): Use feenableexcept
	in example.
	(Floating-point precision): Change to match above change.

From-SVN: r37613
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Andreas Jaeger 2000-11-21 12:12:22 +01:00 committed by Andreas Jaeger
parent cf183ac2bd
commit cfe83a543f
2 changed files with 15 additions and 8 deletions
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6
gcc/f/ChangeLog
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@ -1,3 +1,9 @@
2000-11-21 Andreas Jaeger <aj@suse.de>
* g77.texi (Floating-point Exception Handling): Use feenableexcept
in example.
(Floating-point precision): Change to match above change.
Sun Nov 19 17:29:22 2000 Matthias Klose <doko@marvin.itso-berlin.de>
* g77.texi (Floating-point precision): Adjust example

17
gcc/f/g77.texi
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@ -10475,9 +10475,10 @@ mode and not take the performance hit of @samp{-ffloat-store}. On x86
and m68k GNU systems you can do this with a technique similar to that
for turning on floating-point exceptions
(@pxref{Floating-point Exception Handling}).
The control word could be set to double precision by
replacing the @code{__setfpucw} call or the @code{_FPU_SETCW} macro with one like this:
The control word could be set to double precision by some code like this
one:
@smallexample
#include <fpu_control.h>
@{
fpu_control_t cw = (_FPU_DEFAULT & ~_FPU_EXTENDED) | _FPU_DOUBLE;
_FPU_SETCW(cw);
@ -12150,17 +12151,17 @@ Most systems provide some C-callable mechanism to change this; this can
be invoked at startup using @code{gcc}'s @code{constructor} attribute.
For example, just compiling and linking the following C code with your
program will turn on exception trapping for the ``common'' exceptions
on an x86-based GNU system:
on a GNU system using glibc 2.2 or newer:
@smallexample
#include <fpu_control.h>
#define _GNU_SOURCE 1
#include <fenv.h>
static void __attribute__ ((constructor))
trapfpe ()
@{
fpu_control_t cw =
_FPU_DEFAULT &
~(_FPU_MASK_IM | _FPU_MASK_ZM | _FPU_MASK_OM);
_FPU_SETCW(cw);
/* Enable some exceptions. At startup all exceptions are masked. */
feenableexcept (FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW);
@}
@end smallexample