ref: 32b537dbdb56584c3dfdb9f95f1d1cec0359d7d7
dir: /3rd/mp/test/ld.c/
#include "platform.h"
#include "mp.h"
#include "dat.h"
#include "fns.h"
static int
ldget(ldint *a, uint32_t n)
{
if(n >= a->n) return a->b[a->n - 1]&1;
return a->b[n]&1;
}
static void
ldbits(ldint *a, int n)
{
a->b = realloc(a->b, n);
a->n = n;
}
static ldint *
ldnorm(ldint *a)
{
int i;
if(a->n > 0){
for(i = a->n - 2; i >= 0; i--)
if(a->b[i] != a->b[a->n-1])
break;
ldbits(a, i + 2);
}else{
ldbits(a, 1);
a->b[0] = 0;
}
return a;
}
static void
ldneg(ldint *a)
{
int c, s, z;
uint32_t i;
c = 1;
s = a->b[a->n - 1];
z = 1;
for(i = 0; i < a->n; i++){
if(a->b[i]) z = 0;
c += 1 ^ a->b[i] & 1;
a->b[i] = c & 1;
c >>= 1;
}
if(!z && s == a->b[a->n - 1]){
ldbits(a, a->n + 1);
a->b[a->n - 1] = !s;
}
}
static int
max(int a, int b)
{
return a>b? a : b;
}
ldint *
ldnew(int n)
{
ldint *a;
a = malloc(sizeof(ldint));
if(n <= 0) n = 1;
a->b = malloc(n);
a->n = n;
return a;
}
void
ldfree(ldint *a)
{
if(a == nil) return;
free(a->b);
free(a);
}
mpint *
ldtomp(ldint *a, mpint *b)
{
int s, c;
uint32_t i;
if(b == nil)
b = mpnew(0);
mpbits(b, a->n);
s = a->b[a->n - 1] & 1;
b->sign = 1 - 2 * s;
c = s;
memset(b->p, 0, (a->n + Dbits - 1) / Dbits * Dbytes);
for(i = 0; i < a->n; i++){
c += s ^ a->b[i] & 1;
b->p[i / Dbits] |= (mpdigit)(c & 1) << (i & Dbits - 1);
c >>= 1;
}
b->top = (a->n + Dbits - 1) / Dbits;
mpnorm(b);
return b;
}
static ldint *
itold(int n, ldint *a)
{
uint32_t i;
if(a == nil)
a = ldnew(sizeof(n)*8);
else
ldbits(a, sizeof(n)*8);
for(i = 0; i < sizeof(n)*8; i++)
a->b[i] = n >> i & 1;
ldnorm(a);
return a;
}
static ldint *
pow2told(int n, ldint *a)
{
int k;
k = abs(n);
if(a == nil)
a = ldnew(k+2);
else
ldbits(a, k+2);
memset(a->b, 0, k+2);
a->b[k] = 1;
if(n < 0) ldneg(a);
ldnorm(a);
return a;
}
static char str[16][8192];
static int istr = -1;
char *
LFMT(ldint *a)
{
char *b, *p;
int s, c;
uint32_t i, d;
istr = (istr+1) % nelem(str);
b = str[istr] + 3;
d = (a->n + 3) / 4;
c = s = a->b[a->n - 1];
for(i = 0; i < a->n; i++){
c += s^ldget(a, i);
b[d - 1 - (i >> 2)] |= (c & 1) << (i & 3);
c >>= 1;
}
for(i = 0; i < d; i++)
b[i] = "0123456789ABCDEF"[(int)b[i]];
p = b;
while(*p == '0' && p[1] != 0) p++;
*--p = 'x';
*--p = '0';
if(a->b[a->n - 1])
*--p = '-';
return p;
}
char *
MFMT(mpint *m)
{
char *b;
istr = (istr+1) % nelem(str);
b = str[istr];
return mptoa(m, 16, b, sizeof(str[istr]));
}
int
ldcmp(ldint *a, ldint *b)
{
int x, y;
int i, r;
r = max(a->n, b->n);
if(a->b[a->n-1] != b->b[b->n-1])
return b->b[b->n - 1] - a->b[a->n - 1];
for(i = r - 1; --i >= 0; ){
x = ldget(a, i);
y = ldget(b, i);
if(x != y)
return x - y;
}
return 0;
}
int
ldmagcmp(ldint *a, ldint *b)
{
int s1, s2, r;
s1 = a->b[a->n - 1];
s2 = b->b[b->n - 1];
if(s1) ldneg(a);
if(s2) ldneg(b);
r = ldcmp(a, b);
if(s1) ldneg(a);
if(s2) ldneg(b);
return r;
}
int
ldmpeq(ldint *a, mpint *b)
{
uint32_t i, c;
if(b->sign > 0){
for(i = 0; i < b->top * Dbits; i++)
if(ldget(a, i) != (int)(b->p[i / Dbits] >> (i & Dbits - 1) & 1))
return 0;
for(; i < a->n; i++)
if(a->b[i] != 0)
return 0;
return 1;
}else{
c = 1;
for(i = 0; i < b->top * Dbits; i++){
c += !ldget(a, i);
if((c & 1) != (b->p[i / Dbits] >> (i & Dbits - 1) & 1))
return 0;
c >>= 1;
}
for(; i < a->n; i++)
if(a->b[i] != 1)
return 0;
return 1;
}
}
void
mptarget(mpint *r)
{
int n;
n = rand() & 15;
mpbits(r, n * Dbits);
r->top = n;
prng((void *) r->p, n * Dbytes);
r->sign = 1 - 2 * (rand() & 1);
}
void
ldadd(ldint *a, ldint *b, ldint *q)
{
int r, i, c;
r = max(a->n, b->n) + 1;
ldbits(q, r);
c = 0;
for(i = 0; i < r; i++){
c += ldget(a, i) + ldget(b, i);
q->b[i] = c & 1;
c >>= 1;
}
ldnorm(q);
}
void
ldmagadd(ldint *a, ldint *b, ldint *q)
{
int i, r, s1, s2, c1, c2, co;
r = max(a->n, b->n) + 2;
ldbits(q, r);
co = 0;
s1 = c1 = a->b[a->n - 1] & 1;
s2 = c2 = b->b[b->n - 1] & 1;
for(i = 0; i < r; i++){
c1 += s1 ^ ldget(a, i) & 1;
c2 += s2 ^ ldget(b, i) & 1;
co += (c1 & 1) + (c2 & 1);
q->b[i] = co & 1;
co >>= 1;
c1 >>= 1;
c2 >>= 1;
}
ldnorm(q);
}
void
ldmagsub(ldint *a, ldint *b, ldint *q)
{
int i, r, s1, s2, c1, c2, co;
r = max(a->n, b->n) + 2;
ldbits(q, r);
co = 0;
s1 = c1 = a->b[a->n - 1] & 1;
s2 = c2 = 1 ^ b->b[b->n - 1] & 1;
for(i = 0; i < r; i++){
c1 += s1 ^ ldget(a, i) & 1;
c2 += s2 ^ ldget(b, i) & 1;
co += (c1 & 1) + (c2 & 1);
q->b[i] = co & 1;
co >>= 1;
c1 >>= 1;
c2 >>= 1;
}
ldnorm(q);
}
void
ldsub(ldint *a, ldint *b, ldint *q)
{
int r, i, c;
r = max(a->n, b->n) + 1;
ldbits(q, r);
c = 1;
for(i = 0; i < r; i++){
c += ldget(a, i) + (1^ldget(b, i));
q->b[i] = c & 1;
c >>= 1;
}
ldnorm(q);
}
static void
lddiv(ldint *a, ldint *b, ldint *q, ldint *r)
{
int n, i, j, c, s;
n = max(a->n, b->n) + 1;
ldbits(q, n);
ldbits(r, n);
memset(r->b, 0, n);
c = s = a->b[a->n-1];
for(i = 0; i < n; i++){
c += s ^ ldget(a, i);
q->b[i] = c & 1;
c >>= 1;
}
for(i = 0; i < n; i++){
for(j = n-1; --j >= 0; )
r->b[j + 1] = r->b[j];
r->b[0] = q->b[n - 1];
for(j = n-1; --j >= 0; )
q->b[j + 1] = q->b[j];
q->b[0] = !r->b[n - 1];
c = s = r->b[n - 1] == b->b[b->n - 1];
for(j = 0; j < n; j++){
c += r->b[j] + (s ^ ldget(b, j));
r->b[j] = c & 1;
c >>= 1;
}
}
for(j = n-1; --j >= 0; )
q->b[j + 1] = q->b[j];
q->b[0] = 1;
if(r->b[r->n - 1]){
c = 0;
for(j = 0; j < n; j++){
c += 1 + q->b[j];
q->b[j] = c & 1;
c >>= 1;
}
c = s = b->b[b->n - 1];
for(j = 0; j < n; j++){
c += r->b[j] + (s ^ ldget(b, j));
r->b[j] = c & 1;
c >>= 1;
}
}
c = s = a->b[a->n-1] ^ b->b[b->n-1];
for(j = 0; j < n; j++){
c += s ^ q->b[j];
q->b[j] = c & 1;
c >>= 1;
}
c = s = a->b[a->n-1];
for(j = 0; j < n; j++){
c += s ^ r->b[j];
r->b[j] = c & 1;
c >>= 1;
}
ldnorm(q);
ldnorm(r);
}
void
lddiv_(ldint *a, ldint *b, ldint *q, ldint *r)
{
if(ldmpeq(b, mpzero)){
memset(q->b, 0, q->n);
memset(r->b, 0, r->n);
return;
}
lddiv(a, b, q, r);
}
void
mpdiv_(mpint *a, mpint *b, mpint *q, mpint *r)
{
if(mpcmp(b, mpzero) == 0){
mpassign(mpzero, q);
mpassign(mpzero, r);
return;
}
mpdiv(a, b, q, r);
}
void
ldand(ldint *a, ldint *b, ldint *q)
{
int r, i;
r = max(a->n, b->n);
ldbits(q, r);
for(i = 0; i < r; i++)
q->b[i] = ldget(a, i) & ldget(b, i);
ldnorm(q);
}
void
ldbic(ldint *a, ldint *b, ldint *q)
{
int r, i;
r = max(a->n, b->n);
ldbits(q, r);
for(i = 0; i < r; i++)
q->b[i] = ldget(a, i) & ~ldget(b, i);
ldnorm(q);
}
void
ldor(ldint *a, ldint *b, ldint *q)
{
int r, i;
r = max(a->n, b->n);
ldbits(q, r);
for(i = 0; i < r; i++)
q->b[i] = ldget(a, i) | ldget(b, i);
ldnorm(q);
}
void
ldxor(ldint *a, ldint *b, ldint *q)
{
int r, i;
r = max(a->n, b->n);
ldbits(q, r);
for(i = 0; i < r; i++)
q->b[i] = ldget(a, i) ^ ldget(b, i);
ldnorm(q);
}
void
ldleft(ldint *a, int n, ldint *b)
{
int c;
uint32_t i;
if(n < 0){
if(a->n <= (uint32_t)-n){
b->n = 0;
ldnorm(b);
return;
}
c = 0;
if(a->b[a->n - 1])
for(i = 0; i < (uint32_t)-n; i++)
if(a->b[i]){
c = 1;
break;
}
ldbits(b, a->n + n);
for(i = 0; i < a->n + n; i++){
c += a->b[i - n] & 1;
b->b[i] = c & 1;
c >>= 1;
}
}else{
ldbits(b, a->n + n);
memmove(b->b + n, a->b, a->n);
memset(b->b, 0, n);
}
ldnorm(b);
}
void
ldright(ldint *a, int n, ldint *b)
{
ldleft(a, -n, b);
}
void
ldasr(ldint *a, int n, ldint *b)
{
if(n < 0){
ldleft(a, -n, b);
return;
}
if(a->n <= (uint32_t)n){
ldbits(b, 1);
b->b[0] = a->b[a->n - 1];
return;
}
ldbits(b, a->n - n);
memmove(b->b, a->b + n, a->n - n);
ldnorm(b);
}
void
ldnot(ldint *a, ldint *b)
{
uint32_t i;
ldbits(b, a->n);
for(i = 0; i < a->n; i++)
b->b[i] = a->b[i] ^ 1;
}
static uint32_t
xorshift(uint32_t *state)
{
uint32_t x = *state;
x ^= x << 13;
x ^= x >> 17;
x ^= x << 5;
*state = x;
return x;
}
void
testgen(int i, ldint *a)
{
uint32_t j, state;
uint32_t r = 0;
if(i < 257)
itold(i-128, a);
else if(i < 514)
pow2told(i-385, a);
else{
state = i;
xorshift(&state);
xorshift(&state);
xorshift(&state);
ldbits(a, Dbits * (1 + (xorshift(&state) & 15)));
for(j = 0; j < a->n; j++){
if((j & 31) == 0)
r = xorshift(&state);
a->b[j] = r & 1;
r >>= 1;
}
}
}