コード例 #1
0
ファイル: time.c プロジェクト: 420GrayFox/dsl-n55u-bender
/*
 * Advance the per cpu tick counter up to the time given with the
 * "time" argument. The per cpu update consists of accounting
 * the virtual cpu time, calling update_process_times and calling
 * the profiling hook. If xtime is before time it is advanced as well.
 */
void account_ticks(u64 time)
{
	__u32 ticks;
	__u64 tmp;

	/* Calculate how many ticks have passed. */
	if (time < S390_lowcore.jiffy_timer)
		return;
	tmp = time - S390_lowcore.jiffy_timer;
	if (tmp >= 2*CLK_TICKS_PER_JIFFY) {  /* more than two ticks ? */
		ticks = __div(tmp, CLK_TICKS_PER_JIFFY) + 1;
		S390_lowcore.jiffy_timer +=
			CLK_TICKS_PER_JIFFY * (__u64) ticks;
	} else if (tmp >= CLK_TICKS_PER_JIFFY) {
		ticks = 2;
		S390_lowcore.jiffy_timer += 2*CLK_TICKS_PER_JIFFY;
	} else {
		ticks = 1;
		S390_lowcore.jiffy_timer += CLK_TICKS_PER_JIFFY;
	}

#ifdef CONFIG_SMP
	/*
	 * Do not rely on the boot cpu to do the calls to do_timer.
	 * Spread it over all cpus instead.
	 */
	write_seqlock(&xtime_lock);
	if (S390_lowcore.jiffy_timer > xtime_cc) {
		__u32 xticks;
		tmp = S390_lowcore.jiffy_timer - xtime_cc;
		if (tmp >= 2*CLK_TICKS_PER_JIFFY) {
			xticks = __div(tmp, CLK_TICKS_PER_JIFFY);
			xtime_cc += (__u64) xticks * CLK_TICKS_PER_JIFFY;
		} else {
			xticks = 1;
			xtime_cc += CLK_TICKS_PER_JIFFY;
		}
		do_timer(xticks);
	}
	write_sequnlock(&xtime_lock);
#else
	do_timer(ticks);
#endif

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
	account_tick_vtime(current);
#else
	while (ticks--)
		update_process_times(user_mode(get_irq_regs()));
#endif

	s390_do_profile();
}
コード例 #2
0
ファイル: div.c プロジェクト: ArmstrongJ/open-watcom-v2
_WCRTLINK div_t div( int numer, int denom )
/*****************************************/
{
#ifdef _M_I86
    return( __div( numer, denom ) );
#else
    div_t   result;

    result.quot = numer / denom;
    result.rem  = numer % denom;
    return( result );
#endif
}
コード例 #3
0
ファイル: xgcd_hgcd.c プロジェクト: clear731/lattice
slong _nmod_poly_xgcd_hgcd(mp_ptr G, mp_ptr S, mp_ptr T, 
                          mp_srcptr A, slong lenA, mp_srcptr B, slong lenB, 
                          nmod_t mod)
{
	const slong cutoff = FLINT_BIT_COUNT(mod.n) <= 8 ? 
                        NMOD_POLY_SMALL_GCD_CUTOFF : NMOD_POLY_GCD_CUTOFF;

    slong lenG, lenS, lenT;

    if (lenB == 1)
    {
        G[0] = B[0];
        T[0] = 1;
        lenG = 1;
        lenS = 0;
        lenT = 1;
    }
    else
    {
        mp_ptr q = _nmod_vec_init(lenA + lenB);
        mp_ptr r = q + lenA;

        slong lenq, lenr;

        __divrem(q, lenq, r, lenr, A, lenA, B, lenB);

        if (lenr == 0)
        {
            __set(G, lenG, B, lenB);
            T[0] = 1;
            lenS = 0;
            lenT = 1;
        }
        else
        {
            mp_ptr h, j, v, w, R[4], X;
            slong lenh, lenj, lenv, lenw, lenR[4];
            int sgnR;

            lenh = lenj = lenB;
            lenv = lenw = lenA + lenB - 2;
            lenR[0] = lenR[1] = lenR[2] = lenR[3] = (lenB + 1) / 2;

            X = _nmod_vec_init(2 * lenh + 2 * lenv + 4 * lenR[0]);
            h = X;
            j = h + lenh;
            v = j + lenj;
            w = v + lenv;
            R[0] = w + lenw;
            R[1] = R[0] + lenR[0];
            R[2] = R[1] + lenR[1];
            R[3] = R[2] + lenR[2];

            sgnR = _nmod_poly_hgcd(R, lenR, h, &lenh, j, &lenj, B, lenB, r, lenr, mod);

            if (sgnR > 0)
            {
                _nmod_vec_neg(S, R[1], lenR[1], mod);
                _nmod_vec_set(T, R[0], lenR[0]);
            }
            else
            {
                _nmod_vec_set(S, R[1], lenR[1]);
                _nmod_vec_neg(T, R[0], lenR[0], mod);
            }
            lenS = lenR[1];
            lenT = lenR[0];

            while (lenj != 0)
            {
                __divrem(q, lenq, r, lenr, h, lenh, j, lenj);
                __mul(v, lenv, q, lenq, T, lenT);
                {
                    slong l;
                    _nmod_vec_swap(S, T, FLINT_MAX(lenS, lenT));
                    l = lenS; lenS = lenT; lenT = l;
                }
                __sub(T, lenT, T, lenT, v, lenv);

                if (lenr == 0)
                {
                    __set(G, lenG, j, lenj);

                    goto cofactor;
                }
                if (lenj < cutoff)
                {
                    mp_ptr u0 = R[0], u1 = R[1];
                    slong lenu0 = lenr - 1, lenu1 = lenj - 1;

                    lenG = _nmod_poly_xgcd_euclidean(G, u0, u1, j, lenj, r, lenr, mod);
                    MPN_NORM(u0, lenu0);
                    MPN_NORM(u1, lenu1);

                    __mul(v, lenv, S, lenS, u0, lenu0);
                    __mul(w, lenw, T, lenT, u1, lenu1);
                    __add(S, lenS, v, lenv, w, lenw);

                    goto cofactor;
                }

                sgnR = _nmod_poly_hgcd(R, lenR, h, &lenh, j, &lenj, j,lenj, r, lenr, mod);

                __mul(v, lenv, R[1], lenR[1], T, lenT);
                __mul(w, lenw, R[2], lenR[2], S, lenS);

                __mul(q, lenq, S, lenS, R[3], lenR[3]);
                if (sgnR > 0)
                    __sub(S, lenS, q, lenq, v, lenv);
                else
                    __sub(S, lenS, v, lenv, q, lenq);

                __mul(q, lenq, T, lenT, R[0], lenR[0]);
                if (sgnR > WORD(0))
                    __sub(T, lenT, q, lenq, w, lenw);
                else
                    __sub(T, lenT, w, lenw, q, lenq);
            }
            __set(G, lenG, h, lenh);

            cofactor:

            __mul(v, lenv, S, lenS, A, lenA);
            __sub(w, lenw, G, lenG, v, lenv);
            __div(T, lenT, w, lenw, B, lenB);

            _nmod_vec_clear(X);
        }
        _nmod_vec_clear(q);
    }
    flint_mpn_zero(S + lenS, lenB - 1 - lenS);
    flint_mpn_zero(T + lenT, lenA - 1 - lenT);

    return lenG;
}