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Remove useless code from do_divide

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* libguile/numbers.c (do_divide): Remove code which handled a case
  that never occurs: a zero bignum.
This commit is contained in:
Mark H Weaver 2011-01-26 02:50:03 -05:00 • committed by Andy Wingo
parent 41df63cf16
commit a4955a0412
1 changed files with 23 additions and 37 deletions
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60
libguile/numbers.c
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@ -5124,47 +5124,33 @@ do_divide (SCM x, SCM y, int inexact)
}
else if (SCM_BIGP (y))
{
int y_is_zero = (mpz_sgn (SCM_I_BIG_MPZ (y)) == 0);
if (y_is_zero)
/* big_x / big_y */
if (inexact)
{
#ifndef ALLOW_DIVIDE_BY_EXACT_ZERO
scm_num_overflow (s_divide);
#else
int sgn = mpz_sgn (SCM_I_BIG_MPZ (x));
scm_remember_upto_here_1 (x);
return (sgn == 0) ? scm_nan () : scm_inf ();
#endif
/* It's easily possible for the ratio x/y to fit a double
but one or both x and y be too big to fit a double,
hence the use of mpq_get_d rather than converting and
dividing. */
mpq_t q;
*mpq_numref(q) = *SCM_I_BIG_MPZ (x);
*mpq_denref(q) = *SCM_I_BIG_MPZ (y);
return scm_from_double (mpq_get_d (q));
}
else
{
/* big_x / big_y */
if (inexact)
{
/* It's easily possible for the ratio x/y to fit a double
but one or both x and y be too big to fit a double,
hence the use of mpq_get_d rather than converting and
dividing. */
mpq_t q;
*mpq_numref(q) = *SCM_I_BIG_MPZ (x);
*mpq_denref(q) = *SCM_I_BIG_MPZ (y);
return scm_from_double (mpq_get_d (q));
}
else
{
int divisible_p = mpz_divisible_p (SCM_I_BIG_MPZ (x),
SCM_I_BIG_MPZ (y));
if (divisible_p)
{
SCM result = scm_i_mkbig ();
mpz_divexact (SCM_I_BIG_MPZ (result),
SCM_I_BIG_MPZ (x),
SCM_I_BIG_MPZ (y));
scm_remember_upto_here_2 (x, y);
return scm_i_normbig (result);
}
else
return scm_i_make_ratio (x, y);
}
int divisible_p = mpz_divisible_p (SCM_I_BIG_MPZ (x),
SCM_I_BIG_MPZ (y));
if (divisible_p)
{
SCM result = scm_i_mkbig ();
mpz_divexact (SCM_I_BIG_MPZ (result),
SCM_I_BIG_MPZ (x),
SCM_I_BIG_MPZ (y));
scm_remember_upto_here_2 (x, y);
return scm_i_normbig (result);
}
else
return scm_i_make_ratio (x, y);
}
}
else if (SCM_REALP (y))