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#define NEED_MP_H
#ifndef FIRSTWORD
#include "include.h"
#endif
#include "num_include.h"
/* #include "arith.h" */
/* I believe the instructions used here are ok for 68010.. */
#ifdef MC68K
#define MC68020
#endif
/* static for gnuwin95 the save routine is not saving statics... */
object *gclModulus;
#define FIXNUMP(x) (type_of(x)==t_fixnum)
/* Note: the gclModulus is guaranteed > 0 */
#define FIX_MOD(X,MOD) { \
register fixnum MOD_2; \
if (X > (MOD_2=(MOD>>1))) \
X=X-MOD; \
else \
if (X < -MOD_2) \
X=X+MOD; \
else \
if (X == -MOD_2 && (MOD&0x1)==0) \
X=X+MOD; \
}
object ctimes(object a, object b),cplus(object a, object b),cdifference(object a, object b),cmod(object x);
object make_integer(__mpz_struct *u);
#define our_minus(a,b) ((FIXNUMP(a)&&FIXNUMP(b))?fixnum_sub(fix(a),fix(b)): \
number_minus(a,b))
#define our_plus(a,b) ((FIXNUMP(a)&&FIXNUMP(b))?fixnum_add(fix(a),fix(b)): \
number_plus(a,b))
#define our_times(a,b) number_times(a,b)
/* fix (and check) this on 64 bit machines, where long is the long long */
#ifdef HAVE_LONG_LONG
static int
dblrem(int a, int b, int mod)
{
return (int)(((long long int)a*(long long int)b)%(long long int) mod);
}
#else
static int
dblrem(a,b,mod)
int a,b,mod;
{int h,sign;
if (a<0)
{a= -a; sign= (b<0)? (b= -b,1) :-1;}
else { sign= (b<0) ? (b= -b,-1) : 1;}
{ mp_limb_t ar[2],q[2],aa;
aa = a;
ar[1]=mpn_mul_1(ar,&aa,1,b);
h = mpn_divrem_1(q,0,ar,2,mod);
return ((sign<0) ? -h :h);
}
}
#endif
/* #if sizeof(fixnum) != sizeof(mp_limb_t) */
/* #error fixnum mp_limb_t size mismatch */
/* #endif */
static fixnum
fdblrem(fixnum a,fixnum b,fixnum mod) {
fixnum h,sign;
mp_limb_t ar[2],q[2],aa;
if (a<0) {
a= -a;
sign= (b<0) ? (b= -b,1) : -1;
} else
sign= (b<0) ? (b= -b,-1) : 1;
aa = a;
ar[1]=mpn_mul_1(ar,&aa,1,b);
h = mpn_divrem_1(q,0,ar,2,mod);
return ((sign<0) ? -h :h);
}
object
cmod(object x) {
register object mod = *gclModulus;
if (mod==Cnil)
return(x);
else if ((type_of(mod)==t_fixnum && type_of(x)==t_fixnum)) {
register fixnum xx,mm=fix(mod);
if (mm==2)
return small_fixnum((fix(x)&1));
xx=(fix(x)%mm);
FIX_MOD(xx,mm);
return make_fixnum(xx);
} else {
object rp,mod2;
int compare;
integer_quotient_remainder_1(x,mod,NULL,&rp,0);/*FIXME*/
mod2=integer_fix_shift(mod,-1);
compare = number_compare(rp,small_fixnum(0));
if (compare >= 0) {
compare=number_compare(rp,mod2);
if (compare > 0) rp=number_minus(rp,mod);
} else if (number_compare(number_negate(mod2), rp) > 0)
rp = number_plus(rp,mod);
return rp;
}
}
object
ctimes(object a, object b) {
object mod = *gclModulus;
if (FIXNUMP(mod)) {
register fixnum res, m=fix(mod);
if (sizeof(fixnum)==sizeof(int) || (m>>(sizeof(int)*8)==(m>>(sizeof(fixnum)*8-1))))
res=dblrem(fix(a),fix(b),m);
else
res=fdblrem(fix(a),fix(b),m);
FIX_MOD(res,m);
return make_fixnum(res);
} else if (mod==Cnil)
return(our_times(a,b));
return cmod(number_times(a,b));
}
#define SMALL_MODULUS_P(mod) (FIXNUMP(mod) && (fix(mod) < (MOST_POSITIVE_FIX)/2))
object
cdifference(object a, object b) {
object mod = *gclModulus;
if (SMALL_MODULUS_P(mod)) {
register fixnum res,m;
res=((fix(a)-fix(b))%(m=fix(mod)));
FIX_MOD(res,m);
return make_fixnum(res);
} else if (mod==Cnil)
return (our_minus(a,b));
else return(cmod(number_minus(a,b)));
}
object
cplus(object a, object b) {
object mod = *gclModulus;
if (SMALL_MODULUS_P(mod)) {
register fixnum res,m;
res=((fix(a)+fix(b))%(m=fix(mod)));
FIX_MOD(res,m);
return make_fixnum(res);
} else if (mod==Cnil)
return (our_plus(a,b));
return(cmod(number_plus(a,b)));
}
DEFUN_NEW("CMOD",object,fScmod,SI,1,1,NONE,OO,OO,OO,OO,(object num),"") {
/* 1 args */
num=cmod(num);
RETURN1(num);
}
DEFUN_NEW("CPLUS",object,fScplus,SI,2,2,NONE,OO,OO,OO,OO,(object x0,object x1),"") {
/* 2 args */
x0 = cplus(x0,x1);
RETURN1( x0 );
}
DEFUN_NEW("CTIMES",object,fSctimes,SI,2,2,NONE,OO,OO,OO,OO,(object x0,object x1),"") {
/* 2 args */
x0=ctimes(x0,x1);
RETURN1(x0);
}
DEFUN_NEW("CDIFFERENCE",object,fScdifference,SI,2,2,NONE,OO,OO,OO,OO,(object x0,object x1),"") {
/* 2 args */
x0=cdifference(x0,x1);
RETURN1(x0);
}
void
gcl_init_cmac(void) {
gclModulus = (&((make_si_special("MODULUS",Cnil))->s.s_dbind));
}
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