egcs-980129 (and gcc) crash with xlisp's xlbignum.c

[Horst von Brand]

The following makes gcc-2.7.2.3 (from RedHat-5.0), gcc-2.8.0 and
egcs-980129 crash on i586-pc-linux-gnu when compiled with -O2. Without
optimization the compilation finishes without troubles. I'm using
glibc-2.0.6-9 (RedHat update) and binutils-2.8.1.0.19

extern __inline  double
ldexp (double __x, int __y)
{
  register double __value;
  __asm __volatile__
    ("fscale"
     : "=t" (__value) : "0" (__x), "u" ((double) __y));

  return __value;
}

void cvtflobignum () 
{
  unsigned short *v;
  int size, shift;
  double mantissa;

  if (shift < 16)
    mantissa = ldexp(mantissa, -shift);

   
  for (; size > 0 && mantissa != 0.0; size--, v++) {
    mantissa = ldexp(mantissa, 16);
    *v = (unsigned short) mantissa;
  }
}
-- 
Horst von Brand                           mailto:vonbrand@pc17.usm.edu.ec