1 /* mpn_mul_1 -- Multiply a limb vector with a single limb and store the 2 product in a second limb vector. 3 4 Copyright 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002 Free Software 5 Foundation, Inc. 6 7 This file is part of the GNU MP Library. 8 9 The GNU MP Library is free software; you can redistribute it and/or modify 10 it under the terms of the GNU Lesser General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 The GNU MP Library is distributed in the hope that it will be useful, but 15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17 License for more details. 18 19 You should have received a copy of the GNU Lesser General Public License 20 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 21 22 #include "gmp.h" 23 #include "gmp-impl.h" 24 #include "longlong.h" 25 26 27 #if GMP_NAIL_BITS == 0 28 29 mp_limb_t 30 mpn_mul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl) 31 { 32 mp_limb_t ul, cl, hpl, lpl; 33 34 ASSERT (n >= 1); 35 ASSERT (MPN_SAME_OR_INCR_P (rp, up, n)); 36 37 cl = 0; 38 do 39 { 40 ul = *up++; 41 umul_ppmm (hpl, lpl, ul, vl); 42 43 lpl += cl; 44 cl = (lpl < cl) + hpl; 45 46 *rp++ = lpl; 47 } 48 while (--n != 0); 49 50 return cl; 51 } 52 53 #endif 54 55 #if GMP_NAIL_BITS >= 1 56 57 mp_limb_t 58 mpn_mul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl) 59 { 60 mp_limb_t shifted_vl, ul, lpl, hpl, prev_hpl, xw, cl, xl; 61 62 ASSERT (n >= 1); 63 ASSERT (MPN_SAME_OR_INCR_P (rp, up, n)); 64 ASSERT_MPN (up, n); 65 ASSERT_LIMB (vl); 66 67 shifted_vl = vl << GMP_NAIL_BITS; 68 cl = 0; 69 prev_hpl = 0; 70 do 71 { 72 ul = *up++; 73 74 umul_ppmm (hpl, lpl, ul, shifted_vl); 75 lpl >>= GMP_NAIL_BITS; 76 xw = prev_hpl + lpl + cl; 77 cl = xw >> GMP_NUMB_BITS; 78 xl = xw & GMP_NUMB_MASK; 79 *rp++ = xl; 80 prev_hpl = hpl; 81 } 82 while (--n != 0); 83 84 return prev_hpl + cl; 85 } 86 87 #endif 88