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| author | Marco Bodrato <bodrato@mail.dm.unipi.it> | 2019-09-20 20:36:30 +0200 |
|---|---|---|
| committer | Marco Bodrato <bodrato@mail.dm.unipi.it> | 2019-09-20 20:36:30 +0200 |
| commit | de50d1041cbb8a55e3d2607d6dc862ed01be12c3 (patch) | |
| tree | 83ff6700758a6f0d0d900685a3442f18648a771f /mpz | |
| parent | d4c37ea30aad21901406ec5be08446b9a03ee14e (diff) | |
| download | gmp-de50d1041cbb8a55e3d2607d6dc862ed01be12c3.tar.gz | |
mpz/primorial_ui.c: Compress table in a 15-bit constant.
Diffstat (limited to 'mpz')
| -rw-r--r-- | mpz/primorial_ui.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/mpz/primorial_ui.c b/mpz/primorial_ui.c index 75be43a2e..27039198c 100644 --- a/mpz/primorial_ui.c +++ b/mpz/primorial_ui.c @@ -108,13 +108,11 @@ primesieve_size (mp_limb_t n) { return n_to_bit(n) / GMP_LIMB_BITS + 1; } void mpz_primorial_ui (mpz_ptr x, unsigned long n) { - static const mp_limb_t table[] = { 1, 1, 2, 6, 6 }; - ASSERT (n <= GMP_NUMB_MAX); - if (n < numberof (table)) + if (n < 5) { - MPZ_NEWALLOC (x, 1)[0] = table[n]; + MPZ_NEWALLOC (x, 1)[0] = (066211 >> (n*3)) & 7; SIZ (x) = 1; } else @@ -135,7 +133,7 @@ mpz_primorial_ui (mpz_ptr x, unsigned long n) j = 0; - prod = table[numberof (table)-1]; + prod = 6; /* Store primes from 5 to n */ { @@ -143,7 +141,7 @@ mpz_primorial_ui (mpz_ptr x, unsigned long n) max_prod = GMP_NUMB_MAX / n; - LOOP_ON_SIEVE_BEGIN (prime, n_to_bit(numberof (table)), n_to_bit (n), 0, sieve); + LOOP_ON_SIEVE_BEGIN (prime, n_to_bit(5), n_to_bit (n), 0, sieve); FACTOR_LIST_STORE (prime, prod, max_prod, factors, j); LOOP_ON_SIEVE_END; } |