add_n.c

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/**
 *  Copyright (C) 2026 HJimmyK(Jericho Knox)
 *
 *  This file is part of LAMMP.
 *
 *  LAMMP is free software: you can redistribute it and/or modify it under
 *  the terms of the GNU Lesser General Public License (LGPL) as published
 *   by the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed WITHOUT ANY WARRANTY.
 *
 *  See <https://www.gnu.org/licenses/>.
 */
 
#include "../../../../include/lammp/lmmpn.h"
 
 
mp_limb_t lmmp_add_nc_(mp_ptr dst, mp_srcptr numa, mp_srcptr numb, mp_size_t n, mp_limb_t c) {
    mp_size_t i = 0;
    mp_limb_t cy = c;
 
    for (; i + 4 <= n; i += 4) {
        mp_limb_t a0, b0, r0;
        mp_limb_t a1, b1, r1;
        mp_limb_t a2, b2, r2;
        mp_limb_t a3, b3, r3;
 
        a0 = numa[i + 0];
        b0 = numb[i + 0];
 
        a1 = numa[i + 1];
        b1 = numb[i + 1];
 
        a2 = numa[i + 2];
        b2 = numb[i + 2];
 
        a3 = numa[i + 3];
        b3 = numb[i + 3];
 
        r0 = a0 + cy;
        cy = (r0 < cy);
        r0 += b0;
        cy += (r0 < b0);
 
        r1 = a1 + cy;
        cy = (r1 < cy);
        r1 += b1;
        cy += (r1 < b1);
 
        r2 = a2 + cy;
        cy = (r2 < cy);
        r2 += b2;
        cy += (r2 < b2);
 
        r3 = a3 + cy;
        cy = (r3 < cy);
        r3 += b3;
        cy += (r3 < b3);
 
        dst[i + 0] = r0;
        dst[i + 1] = r1;
        dst[i + 2] = r2;
        dst[i + 3] = r3;
    }
 
    for (; i < n; i++) {
        mp_limb_t a, b, r;
        a = numa[i];
        b = numb[i];
        r = a + cy;
        cy = (r < cy);
        r += b;
        cy += (r < b);
        dst[i] = r;
    }
 
    return cy;
}
 
mp_limb_t lmmp_add_n_(mp_ptr dst, mp_srcptr numa, mp_srcptr numb, mp_size_t n) {
    mp_size_t i = 0;
    mp_limb_t cy = 0;
 
    for (; i + 4 <= n; i += 4) {
        mp_limb_t a0, b0, r0;
        mp_limb_t a1, b1, r1;
        mp_limb_t a2, b2, r2;
        mp_limb_t a3, b3, r3;
 
        a0 = numa[i + 0];
        b0 = numb[i + 0];
 
        a1 = numa[i + 1];
        b1 = numb[i + 1];
 
        a2 = numa[i + 2];
        b2 = numb[i + 2];
 
        a3 = numa[i + 3];
        b3 = numb[i + 3];
 
        r0 = a0 + cy;
        cy = (r0 < cy);
        r0 += b0;
        cy += (r0 < b0);
 
        r1 = a1 + cy;
        cy = (r1 < cy);
        r1 += b1;
        cy += (r1 < b1);
 
        r2 = a2 + cy;
        cy = (r2 < cy);
        r2 += b2;
        cy += (r2 < b2);
 
        r3 = a3 + cy;
        cy = (r3 < cy);
        r3 += b3;
        cy += (r3 < b3);
 
        dst[i + 0] = r0;
        dst[i + 1] = r1;
        dst[i + 2] = r2;
        dst[i + 3] = r3;
    }
 
    for (; i < n; i++) {
        mp_limb_t a, b, r;
        a = numa[i];
        b = numb[i];
        r = a + cy;
        cy = (r < cy);
        r += b;
        cy += (r < b);
        dst[i] = r;
    }
 
    return cy;
}