| from cupy import _core | |
| def _negative_gcd_error(): | |
| raise TypeError("gcd cannot be computed with boolean arrays") | |
| def _negative_lcm_error(): | |
| raise TypeError("lcm cannot be computed with boolean arrays") | |
| _gcd_preamble = ''' | |
| template <typename T> inline __device__ T gcd(T in0, T in1) { | |
| T r; | |
| while (in1 != 0) { | |
| r = in0 % in1; | |
| in0 = in1; | |
| in1 = r; | |
| } | |
| if (in0 < 0) | |
| return -in0; | |
| return in0; | |
| } | |
| ''' | |
| gcd = _core.create_ufunc( | |
| 'cupy_gcd', | |
| (('??->?', _negative_gcd_error), | |
| 'bb->b', 'BB->B', 'hh->h', 'HH->H', 'ii->i', 'II->I', 'll->l', | |
| 'LL->L', 'qq->q', 'QQ->Q'), | |
| 'out0 = gcd(in0, in1)', | |
| preamble=_gcd_preamble, | |
| doc='''Computes gcd of ``x1`` and ``x2`` elementwise. | |
| .. seealso:: :data:`numpy.gcd` | |
| ''') | |
| _lcm_preamble = _gcd_preamble + ''' | |
| template <typename T> inline __device__ T lcm(T in0, T in1) { | |
| T r = gcd(in0, in1); | |
| if (r == 0) | |
| return 0; | |
| r = in0 / r * in1; | |
| if (r < 0) | |
| return -r; | |
| return r; | |
| } | |
| ''' | |
| lcm = _core.create_ufunc( | |
| 'cupy_lcm', | |
| (('??->?', _negative_lcm_error), | |
| 'bb->b', 'BB->B', 'hh->h', 'HH->H', 'ii->i', 'II->I', 'll->l', | |
| 'LL->L', 'qq->q', 'QQ->Q'), | |
| 'out0 = lcm(in0, in1)', | |
| preamble=_lcm_preamble, | |
| doc='''Computes lcm of ``x1`` and ``x2`` elementwise. | |
| .. seealso:: :data:`numpy.lcm` | |
| ''') | |