diff options
Diffstat (limited to 'src/exp_2.c')
| -rw-r--r-- | src/exp_2.c | 46 |
1 files changed, 1 insertions, 45 deletions
diff --git a/src/exp_2.c b/src/exp_2.c index cc1c5f3c0..c4fe70f03 100644 --- a/src/exp_2.c +++ b/src/exp_2.c @@ -21,9 +21,7 @@ along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ -#ifdef MPFR_LONG_WITHIN_LIMB -#define MPFR_NEED_LONGLONG_H /* for count_leading_zeros */ -#endif +#define MPFR_NEED_LONGLONG_H /* MPFR_INT_CEIL_LOG2 */ #include "mpfr-impl.h" static unsigned long @@ -35,48 +33,6 @@ mpz_normalize (mpz_t, mpz_t, mpfr_exp_t); static mpfr_exp_t mpz_normalize2 (mpz_t, mpz_t, mpfr_exp_t, mpfr_exp_t); -/* count the number of significant bits of n, i.e., - nbits(unsigned long) - count_leading_zeros (n) */ -int -mpfr_nbits_ulong (unsigned long n) -{ -#ifdef MPFR_LONG_WITHIN_LIMB - int cnt; - count_leading_zeros (cnt, (mp_limb_t) n); - return GMP_NUMB_BITS - cnt; -#else - int nbits = 0; - - MPFR_ASSERTD (n > 0); - while (n >= 0x10000) - { - n >>= 16; - nbits += 16; - } - MPFR_ASSERTD (n <= 0xffff); - if (n >= 0x100) - { - n >>= 8; - nbits += 8; - } - MPFR_ASSERTD (n <= 0xff); - if (n >= 0x10) - { - n >>= 4; - nbits += 4; - } - MPFR_ASSERTD (n <= 0xf); - if (n >= 4) - { - n >>= 2; - nbits += 2; - } - MPFR_ASSERTD (n <= 3); - /* now n = 1, 2, or 3 */ - return nbits + 1 + (n >= 2); -#endif -} - /* if k = the number of bits of z > q, divides z by 2^(k-q) and returns k-q. Otherwise do nothing and return 0. */ |