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| author | Andreas Jaeger <aj@suse.de> | 2000-11-21 12:12:22 +0100 |
|---|---|---|
| committer | Andreas Jaeger <aj@gcc.gnu.org> | 2000-11-21 12:12:22 +0100 |
| commit | cfe83a543f912bda277a1dc8b4defaf2c86f4fc4 (patch) | |
| tree | 69815099cadd99ff21ddb8a6c9577708117eb46f /gcc | |
| parent | cf183ac2bdc27a72165fd357bdc35cdcc7a1257d (diff) | |
| download | gcc-cfe83a543f912bda277a1dc8b4defaf2c86f4fc4.zip gcc-cfe83a543f912bda277a1dc8b4defaf2c86f4fc4.tar.gz gcc-cfe83a543f912bda277a1dc8b4defaf2c86f4fc4.tar.bz2 | |
g77.texi (Floating-point Exception Handling): Use feenableexcept in example.
* g77.texi (Floating-point Exception Handling): Use feenableexcept
in example.
(Floating-point precision): Change to match above change.
From-SVN: r37613
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/f/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/f/g77.texi | 17 |
2 files changed, 15 insertions, 8 deletions
diff --git a/gcc/f/ChangeLog b/gcc/f/ChangeLog index 9cc87fb..61a1f52 100644 --- a/gcc/f/ChangeLog +++ b/gcc/f/ChangeLog @@ -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 diff --git a/gcc/f/g77.texi b/gcc/f/g77.texi index 72a793c..842f4e4 100644 --- a/gcc/f/g77.texi +++ b/gcc/f/g77.texi @@ -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 |