From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001 From: Duncan Wilkie Date: Sat, 18 Nov 2023 06:11:09 -0600 Subject: Initial commit. --- gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c | 82 ++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c (limited to 'gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c') diff --git a/gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c b/gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c new file mode 100644 index 0000000..91dc47c --- /dev/null +++ b/gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c @@ -0,0 +1,82 @@ +/* mpn_sqr_basecase -- Internal routine to square a natural number of length n. + This is a place-holder for z13 to suppress the use of the plain z/arch code. + FIXME: This should really be written in assembly with outer-loop early exit. + + THIS IS AN INTERNAL FUNCTION WITH A MUTABLE INTERFACE. IT IS ONLY + SAFE TO REACH THIS FUNCTION THROUGH DOCUMENTED INTERFACES. + + +Copyright 1991-1994, 1996, 1997, 2000-2005, 2008, 2010, 2011, 2017, 2023 Free +Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + +or + + * the GNU General Public License as published by the Free Software + Foundation; either version 2 of the License, or (at your option) any + later version. + +or both in parallel, as here. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received copies of the GNU General Public License and the +GNU Lesser General Public License along with the GNU MP Library. If not, +see https://www.gnu.org/licenses/. */ + +#include "gmp-impl.h" +#include "longlong.h" + +void +mpn_sqr_basecase (mp_ptr rp, mp_srcptr up, mp_size_t un) +{ + mp_limb_t u0; + mp_limb_t cin; + + u0 = up[0]; + umul_ppmm (cin, rp[0], u0, u0); + ++rp; + + if (--un) { + u0 = u0 << 1; + up += 1; + + rp[un] = mpn_mul_1c (rp, up, un, u0, cin); + + for (;;) { + mp_limb_t ci, x0, c0, hi, lo, x1, c1; + + u0 = up[0]; + ci = -(up[-1] >> (GMP_NUMB_BITS-1)) & u0; // correction term + x0 = rp[1] + ci; + c0 = x0 < ci; + hi, lo; + + umul_ppmm (hi, lo, u0, u0); + x1 = x0 + lo; + c1 = x1 < lo; + cin = hi + c0 + c1; + rp[1] = x1; + rp += 2; + + if (--un == 0) break; + u0 = (up[-1] >> (GMP_NUMB_BITS-1)) + (u0 << 1); + up += 1; + + rp[un] = mpn_addmul_1c (rp, up, un, u0, cin); + } + } + + rp[0] = cin; +} -- cgit v1.2.3