diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | mpn/generic/gcd_1.c | 30 |
2 files changed, 5 insertions, 30 deletions
@@ -1,3 +1,8 @@ +2018-05-28 Niels Möller <nisse@lysator.liu.se> + + * mpn/generic/gcd_1.c (mpn_gcd_1) [USE_ZEROTAB]: Delete unused code + variant for USE_ZEROTAB != 0. + 2018-05-20 Marco Bodrato <bodrato@mail.dm.unipi.it> * bootstrap.c: Define DONT_USE_FLOAT_H before including mini-gmp. diff --git a/mpn/generic/gcd_1.c b/mpn/generic/gcd_1.c index 72cbe9641..1f139391c 100644 --- a/mpn/generic/gcd_1.c +++ b/mpn/generic/gcd_1.c @@ -35,20 +35,6 @@ see https://www.gnu.org/licenses/. */ #define GCD_1_METHOD 2 #endif -#define USE_ZEROTAB 0 - -#if USE_ZEROTAB -#define MAXSHIFT 4 -#define MASK ((1 << MAXSHIFT) - 1) -static const unsigned char zerotab[1 << MAXSHIFT] = -{ -#if MAXSHIFT > 4 - 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, -#endif - 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 -}; -#endif - /* Does not work for U == 0 or V == 0. It would be tough to make it work for V == 0 since gcd(x,0) = x, and U does not generally fit in an mp_limb_t. @@ -161,21 +147,6 @@ mpn_gcd_1 (mp_srcptr up, mp_size_t size, mp_limb_t vlimb) /* u <-- |u - v| */ ulimb = (t ^ vgtu) - vgtu; -#if USE_ZEROTAB - /* Number of trailing zeros is the same no matter if we look at - * t or ulimb, but using t gives more parallelism. */ - c = zerotab[t & MASK]; - - while (UNLIKELY (c == MAXSHIFT)) - { - ulimb >>= MAXSHIFT; - if (0) - strip_u_maybe: - vlimb >>= 1; - - c = zerotab[ulimb & MASK]; - } -#else if (0) { strip_u_maybe: @@ -183,7 +154,6 @@ mpn_gcd_1 (mp_srcptr up, mp_size_t size, mp_limb_t vlimb) t = ulimb; } count_trailing_zeros (c, t); -#endif ulimb = (ulimb >> c) >> 1; } |