yann@607: Original patch from H.J. Lu, as reported there:
yann@607: http://www.nabble.com/PATCH:-Use-short-for-fnstsw-td14775171.html
yann@607: 
yann@607: fnstsw stores 16bit into %ax. The upper 16bit of %eax is unchanged.
yann@607: The new assembler (binutils-2.18.50.0.4 and up) will disallow "fnstsw %eax".
yann@607: 
yann@607: diff -dur glibc-2.6.1.orig/sysdeps/i386/fpu/ftestexcept.c glibc-2.6.1/sysdeps/i386/fpu/ftestexcept.c
yann@607: --- glibc-2.6.1.orig/sysdeps/i386/fpu/ftestexcept.c	2004-03-05 11:14:48.000000000 +0100
yann@607: +++ glibc-2.6.1/sysdeps/i386/fpu/ftestexcept.c	2008-06-24 10:56:14.000000000 +0200
yann@607: @@ -26,7 +26,7 @@
yann@607:  int
yann@607:  fetestexcept (int excepts)
yann@607:  {
yann@607: -  int temp;
yann@607: +  short temp;
yann@607:    int xtemp = 0;
yann@607:  
yann@607:    /* Get current exceptions.  */