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138ca1c14b
urbit/n/r.c
Henry Ault fd49091755 licensing and such
2015-02-10 15:13:17 -08:00

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/* g/r.c
**
*/
#include "all.h"
/* _frag_word(): fast fragment/branch prediction for top word.
*/
static u3_weak
_frag_word(c3_w a_w, u3_noun b)
{
c3_assert(0 != a_w);
{
c3_w dep_w = u3x_dep(a_w);
while ( dep_w ) {
if ( c3n == u3a_is_cell(b) ) {
return u3_none;
}
else {
u3a_cell* b_u = u3a_to_ptr(b);
b = *(((u3_noun*)&(b_u->hed)) + (1 & (a_w >> (dep_w - 1))));
dep_w--;
}
}
return b;
}
}
/* _frag_deep(): fast fragment/branch for deep words.
*/
static u3_weak
_frag_deep(c3_w a_w, u3_noun b)
{
c3_w dep_w = 32;
while ( dep_w ) {
if ( c3n == u3a_is_cell(b) ) {
return u3_none;
}
else {
u3a_cell* b_u = u3a_to_ptr(b);
b = *(((u3_noun*)&(b_u->hed)) + (1 & (a_w >> (dep_w - 1))));
dep_w--;
}
}
return b;
}
/* u3r_at():
**
** Return fragment (a) of (b), or u3_none if not applicable.
*/
u3_weak
u3r_at(u3_atom a, u3_noun b)
{
c3_assert(u3_none != a);
c3_assert(u3_none != b);
u3t_on(far_o);
if ( 0 == a ) {
u3t_off(far_o);
return u3_none;
}
if ( _(u3a_is_cat(a)) ) {
u3t_off(far_o);
return _frag_word(a, b);
}
else {
if ( !_(u3a_is_pug(a)) ) {
u3t_off(far_o);
return u3_none;
}
else {
u3a_atom* a_u = u3a_to_ptr(a);
c3_w len_w = a_u->len_w;
b = _frag_word(a_u->buf_w[len_w - 1], b);
len_w -= 1;
while ( len_w ) {
b = _frag_deep(a_u->buf_w[len_w - 1], b);
if ( u3_none == b ) {
u3t_off(far_o);
return b;
} else {
len_w--;
}
}
u3t_off(far_o);
return b;
}
}
}
/* u3r_mean():
**
** Attempt to deconstruct `a` by axis, noun pairs; 0 terminates.
** Axes must be sorted in tree order.
*/
struct _mean_pair {
c3_w axe_w;
u3_noun* som;
};
static c3_w
_mean_cut(c3_w len_w,
struct _mean_pair* prs_m)
{
c3_w i_w, cut_t, cut_w;
cut_t = 0;
cut_w = 0;
for ( i_w = 0; i_w < len_w; i_w++ ) {
c3_w axe_w = prs_m[i_w].axe_w;
if ( (cut_t == 0) && (3 == u3x_cap(axe_w)) ) {
cut_t = 1;
cut_w = i_w;
}
prs_m[i_w].axe_w = u3x_mas(axe_w);
}
return cut_t ? cut_w : i_w;
}
static c3_o
_mean_extract(u3_noun som,
c3_w len_w,
struct _mean_pair* prs_m)
{
if ( len_w == 0 ) {
return c3y;
}
else if ( (len_w == 1) && (1 == prs_m[0].axe_w) ) {
*prs_m->som = som;
return c3y;
}
else {
if ( c3n == u3a_is_cell(som) ) {
return c3n;
} else {
c3_w cut_w = _mean_cut(len_w, prs_m);
return c3a
(_mean_extract(u3a_h(som), cut_w, prs_m),
_mean_extract(u3a_t(som), (len_w - cut_w), (prs_m + cut_w)));
}
}
}
c3_o
u3r_mean(u3_noun som,
...)
{
va_list ap;
c3_w len_w;
struct _mean_pair* prs_m;
c3_assert(u3_none != som);
/* Count.
*/
len_w = 0;
{
va_start(ap, som);
while ( 1 ) {
if ( 0 == va_arg(ap, c3_w) ) {
break;
}
va_arg(ap, u3_noun*);
len_w++;
}
va_end(ap);
}
prs_m = alloca(len_w * sizeof(struct _mean_pair));
/* Install.
*/
{
c3_w i_w;
va_start(ap, som);
for ( i_w = 0; i_w < len_w; i_w++ ) {
prs_m[i_w].axe_w = va_arg(ap, c3_w);
prs_m[i_w].som = va_arg(ap, u3_noun*);
}
va_end(ap);
}
/* Extract.
*/
return _mean_extract(som, len_w, prs_m);
}
static __inline__ c3_w
_mug_fnv(c3_w has_w)
{
return (has_w * ((c3_w)16777619));
}
static __inline__ c3_w
_mug_out(c3_w has_w)
{
return (has_w >> 31) ^ (has_w & 0x7fffffff);
}
static __inline__ c3_w
_mug_both(c3_w lef_w, c3_w rit_w)
{
c3_w bot_w = _mug_fnv(lef_w ^ _mug_fnv(rit_w));
c3_w out_w = _mug_out(bot_w);
if ( 0 != out_w ) {
return out_w;
}
else {
return _mug_both(lef_w, ++rit_w);
}
}
/* u3r_mug_both():
**
** Join two mugs.
*/
c3_w
u3r_mug_both(c3_w lef_w, c3_w rit_w)
{
return _mug_both(lef_w, rit_w);
}
static __inline__ c3_w
_mug_bytes_in(c3_w off_w, c3_w nby_w, c3_y* byt_y)
{
c3_w i_w;
for ( i_w = 0; i_w < nby_w; i_w++ ) {
off_w = _mug_fnv(off_w ^ byt_y[i_w]);
}
return off_w;
}
static c3_w
_mug_bytes(c3_w off_w, c3_w nby_w, c3_y* byt_y)
{
c3_w has_w = _mug_bytes_in(off_w, nby_w, byt_y);
c3_w out_w = _mug_out(has_w);
if ( 0 != out_w ) {
return out_w;
}
else {
return _mug_bytes(++off_w, nby_w, byt_y);
}
}
static __inline__ c3_w
_mug_words_in_buf(c3_w off_w, c3_w nwd_w, u3_noun veb)
{
u3a_atom* veb_u = u3a_to_ptr(veb);
if ( 0 == nwd_w ) {
return off_w;
} else {
c3_w i_w, x_w;
for ( i_w = 0; i_w < (nwd_w - 1); i_w++ ) {
x_w = veb_u->buf_w[i_w];
{
c3_y a_y = (x_w & 0xff);
c3_y b_y = ((x_w >> 8) & 0xff);
c3_y c_y = ((x_w >> 16) & 0xff);
c3_y d_y = ((x_w >> 24) & 0xff);
off_w = _mug_fnv(off_w ^ a_y);
off_w = _mug_fnv(off_w ^ b_y);
off_w = _mug_fnv(off_w ^ c_y);
off_w = _mug_fnv(off_w ^ d_y);
}
}
x_w = veb_u->buf_w[nwd_w - 1];
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
x_w >>= 8;
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
x_w >>= 8;
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
x_w >>= 8;
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
}
}
}
}
}
return off_w;
}
static __inline__ c3_w
_mug_words_in(c3_w off_w, c3_w nwd_w, const c3_w* wod_w)
{
if ( 0 == nwd_w ) {
return off_w;
} else {
c3_w i_w, x_w;
for ( i_w = 0; i_w < (nwd_w - 1); i_w++ ) {
x_w = wod_w[i_w];
{
c3_y a_y = (x_w & 0xff);
c3_y b_y = ((x_w >> 8) & 0xff);
c3_y c_y = ((x_w >> 16) & 0xff);
c3_y d_y = ((x_w >> 24) & 0xff);
off_w = _mug_fnv(off_w ^ a_y);
off_w = _mug_fnv(off_w ^ b_y);
off_w = _mug_fnv(off_w ^ c_y);
off_w = _mug_fnv(off_w ^ d_y);
}
}
x_w = wod_w[nwd_w - 1];
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
x_w >>= 8;
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
x_w >>= 8;
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
x_w >>= 8;
if ( x_w ) {
off_w = _mug_fnv(off_w ^ (x_w & 0xff));
}
}
}
}
}
return off_w;
}
static c3_w
_mug_words(c3_w off_w, c3_w nwd_w, const c3_w* wod_w)
{
c3_w has_w = _mug_words_in(off_w, nwd_w, wod_w);
c3_w out_w = _mug_out(has_w);
if ( 0 != out_w ) {
return out_w;
}
else {
return _mug_words(++off_w, nwd_w, wod_w);
}
}
static c3_w
_mug_words_buf(c3_w off_w, c3_w nwd_w, u3_noun veb)
{
c3_w has_w = _mug_words_in_buf(off_w, nwd_w, veb);
c3_w out_w = _mug_out(has_w);
if ( 0 != out_w ) {
return out_w;
}
else {
return _mug_words_buf(++off_w, nwd_w, veb);
}
}
/* u3r_mug():
**
** Compute and/or recall the mug (31-bit FNV1a hash) of (a).
*/
c3_w
u3r_mug(u3_noun veb)
{
c3_assert(u3_none != veb);
if ( _(u3a_is_cat(veb)) ) {
c3_w x_w = veb;
return _mug_words(2166136261U, (veb ? 1 : 0), &x_w);
} else {
u3a_noun* veb_u = u3a_to_ptr(veb);
if ( veb_u->mug_w ) {
return veb_u->mug_w;
}
else {
if ( _(u3a_is_cell(veb)) ) {
u3a_cell* veb_u = u3a_to_ptr(veb);
u3_noun hed = veb_u->hed;
u3_noun tel = veb_u->tel;
veb_u->mug_w = u3r_mug_cell(hed, tel);
return veb_u->mug_w;
}
else {
u3a_atom* veb_u = u3a_to_ptr(veb);
c3_w len_w = veb_u->len_w;
veb_u->mug_w = _mug_words_buf(2166136261U, len_w, veb);
return veb_u->mug_w;
}
}
}
}
/* u3r_mug_words():
**
** Compute the mug of `buf`, `len`, LSW first.
*/
c3_w
u3r_mug_words(const c3_w *buf_w,
c3_w len_w)
{
return _mug_words(2166136261U, len_w, buf_w);
}
/* u3r_mug_string():
**
** Compute the mug of `a`, LSB first.
*/
c3_w
u3r_mug_string(const c3_c *a_c)
{
return _mug_bytes(2166136261U, strlen(a_c), (c3_y *)a_c);
}
/* u3r_mug_cell():
**
** Compute the mug of the cell `[hed tel]`.
*/
c3_w
u3r_mug_cell(u3_noun hed,
u3_noun tel)
{
c3_w lus_w = u3r_mug(hed);
c3_w biq_w = u3r_mug(tel);
return u3r_mug_both(lus_w, biq_w);
}
/* u3r_mug_trel():
**
** Compute the mug of `[a b c]`.
*/
c3_w
u3r_mug_trel(u3_noun a,
u3_noun b,
u3_noun c)
{
return u3r_mug_both
(u3r_mug(a), u3r_mug_both(u3r_mug(b), u3r_mug(c)));
}
/* u3r_mug_qual():
**
** Compute the mug of `[a b c d]`.
*/
c3_w
u3r_mug_qual(u3_noun a,
u3_noun b,
u3_noun c,
u3_noun d)
{
return u3r_mug_both
(u3r_mug(a),
u3r_mug_both(u3r_mug(b),
u3r_mug_both(u3r_mug(c), u3r_mug(d))));
}
/* _sung_one(): pick a unified pointer for identical (a) and (b).
*/
static void
_sung_one(u3_noun* a, u3_noun* b)
{
if ( *a == *b ) {
return;
}
else {
c3_o asr_o = u3a_is_senior(u3R, *a);
c3_o bsr_o = u3a_is_senior(u3R, *b);
if ( _(asr_o) && _(bsr_o) ) {
// You shouldn't have let this happen. We don't want to
// descend down to a lower road and free there, because
// synchronization - though this could be revisited under
// certain circumstances.
//
return;
}
if ( _(asr_o) && !_(bsr_o) ){
u3z(*b);
*b = *a;
}
if ( _(bsr_o) && !_(asr_o) ) {
u3z(*a);
*a = *b;
}
if ( u3a_is_north(u3R) ) {
if ( *a <= *b ) {
u3k(*a);
u3z(*b);
*b = *a;
} else {
u3k(*b);
u3z(*a);
*a = *b;
}
}
else {
if ( *a >= *b ) {
u3k(*a);
u3z(*b);
*b = *a;
} else {
u3k(*b);
u3z(*a);
*a = *b;
}
}
}
}
/* _sung_x(): yes if a and b are the same noun, unifying.
*/
static c3_o
_sung_x(u3_noun a, u3_noun b)
{
if ( a == b ) {
return c3y;
}
else {
if ( _(u3a_is_atom(a)) ) {
u3a_atom* a_u = u3a_to_ptr(a);
if ( !_(u3a_is_atom(b)) ||
_(u3a_is_cat(a)) ||
_(u3a_is_cat(b)) )
{
return c3n;
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
if ( a_u->mug_w &&
b_u->mug_w &&
(a_u->mug_w != b_u->mug_w) )
{
return c3n;
}
else {
c3_w w_rez = a_u->len_w;
c3_w w_mox = b_u->len_w;
if ( w_rez != w_mox ) {
return c3n;
}
else {
c3_w i_w;
for ( i_w = 0; i_w < w_rez; i_w++ ) {
if ( a_u->buf_w[i_w] != b_u->buf_w[i_w] ) {
return c3n;
}
}
return c3y;
}
}
}
}
else {
if ( _(u3a_is_atom(b)) ) {
return c3n;
}
else {
u3a_cell* a_u = u3a_to_ptr(a);
u3a_cell* b_u = u3a_to_ptr(b);
if ( a_u->mug_w &&
b_u->mug_w &&
(a_u->mug_w != b_u->mug_w) )
{
return c3n;
}
else {
if ( c3n == _sung_x(a_u->hed, b_u->hed) ) {
return c3n;
}
else {
_sung_one(&a_u->hed, &b_u->hed);
if ( c3n == _sung_x(a_u->tel, b_u->tel) ) {
return c3n;
}
else {
_sung_one(&a_u->tel, &b_u->tel);
return c3y;
}
}
}
}
}
}
}
/* _sing_x():
**
** Yes iff (a) and (b) are the same noun.
*/
static c3_o
_sing_x(u3_noun a,
u3_noun b)
{
c3_assert(u3_none != a);
c3_assert(u3_none != b);
if ( a == b ) {
return c3y;
}
else {
if ( _(u3a_is_atom(a)) ) {
u3a_atom* a_u = u3a_to_ptr(a);
if ( !_(u3a_is_atom(b)) ||
_(u3a_is_cat(a)) ||
_(u3a_is_cat(b)) )
{
return c3n;
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
if ( a_u->mug_w &&
b_u->mug_w &&
(a_u->mug_w != b_u->mug_w) )
{
return c3n;
}
else {
c3_w w_rez = a_u->len_w;
c3_w w_mox = b_u->len_w;
if ( w_rez != w_mox ) {
return c3n;
}
else {
c3_w i_w;
for ( i_w = 0; i_w < w_rez; i_w++ ) {
if ( a_u->buf_w[i_w] != b_u->buf_w[i_w] ) {
return c3n;
}
}
return c3y;
}
}
}
}
else {
if ( _(u3a_is_atom(b)) ) {
return c3n;
}
else {
u3a_cell* a_u = u3a_to_ptr(a);
u3a_cell* b_u = u3a_to_ptr(b);
if ( a_u->mug_w &&
b_u->mug_w &&
(a_u->mug_w != b_u->mug_w) )
{
return c3n;
}
else {
if ( c3n == _sing_x(u3a_h(a), u3a_h(b)) ) {
return c3n;
}
else if ( c3n == _sing_x(u3a_t(a), u3a_t(b)) ) {
return c3n;
}
return c3y;
}
}
}
}
}
/* u3r_sing():
**
** Yes iff (a) and (b) are the same noun.
*/
c3_o
u3r_sing(u3_noun a,
u3_noun b)
{
c3_o ret_o;
u3t_on(euq_o);
ret_o = _sing_x(a, b);
u3t_off(euq_o);
return ret_o;
}
/* u3r_sung(): yes iff (a) and (b) are the same noun, unifying equals.
*/
c3_o
u3r_sung(u3_noun a,
u3_noun b)
{
return _sung_x(a, b);
}
c3_o
u3r_fing(u3_noun a,
u3_noun b)
{
return (a == b) ? c3y : c3n;
}
/* u3r_sing_cell():
**
** Yes iff `[p q]` and `b` are the same noun.
*/
c3_o
u3r_sing_cell(u3_noun p,
u3_noun q,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_sing(p, u3a_h(b)),
u3r_sing(q, u3a_t(b))));
}
c3_o
u3r_fing_cell(u3_noun p,
u3_noun q,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_fing(p, u3a_h(b)),
u3r_fing(q, u3a_t(b))));
}
/* u3r_sing_mixt():
**
** Yes iff `[p q]` and `b` are the same noun.
*/
c3_o
u3r_sing_mixt(const c3_c* p_c,
u3_noun q,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_sing_c(p_c, u3a_h(b)),
u3r_sing(q, u3a_t(b))));
}
c3_o
u3r_fing_mixt(const c3_c* p_c,
u3_noun q,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_sing_c(p_c, u3a_h(b)),
u3r_fing(q, u3a_t(b))));
}
/* u3r_sing_trel():
**
** Yes iff `[p q r]` and `b` are the same noun.
*/
c3_o
u3r_sing_trel(u3_noun p,
u3_noun q,
u3_noun r,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_sing(p, u3a_h(b)),
u3r_sing_cell(q, r, u3a_t(b))));
}
c3_o
u3r_fing_trel(u3_noun p,
u3_noun q,
u3_noun r,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_fing(p, u3a_h(b)),
u3r_fing_cell(q, r, u3a_t(b))));
}
/* u3r_sing_qual():
**
** Yes iff `[p q r]` and `b` are the same noun.
*/
c3_o
u3r_sing_qual(u3_noun p,
u3_noun q,
u3_noun r,
u3_noun s,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_sing(p, u3a_h(b)),
u3r_sing_trel(q, r, s, u3a_t(b))));
}
c3_o
u3r_fing_qual(u3_noun p,
u3_noun q,
u3_noun r,
u3_noun s,
u3_noun b)
{
return c3a(_(u3a_is_cell(b)),
c3a(u3r_fing(p, u3a_h(b)),
u3r_fing_trel(q, r, s, u3a_t(b))));
}
/* u3r_nord():
**
** Return 0, 1 or 2 if `a` is below, equal to, or above `b`.
*/
u3_atom
u3r_nord(u3_noun a,
u3_noun b)
{
c3_assert(u3_none != a);
c3_assert(u3_none != b);
if ( a == b ) {
return 1;
}
else {
if ( _(u3a_is_atom(a)) ) {
if ( !_(u3a_is_atom(b)) ) {
return 0;
} else {
if ( _(u3a_is_cat(a)) ) {
if ( _(u3a_is_cat(b)) ) {
return (a < b) ? 0 : 2;
}
else return 0;
}
else if ( _(u3a_is_cat(b)) ) {
return 2;
}
else {
u3a_atom* a_u = u3a_to_ptr(a);
u3a_atom* b_u = u3a_to_ptr(b);
c3_w w_rez = a_u->len_w;
c3_w w_mox = b_u->len_w;
if ( w_rez != w_mox ) {
return (w_rez < w_mox) ? 0 : 2;
}
else {
c3_w i_w;
for ( i_w = 0; i_w < w_rez; i_w++ ) {
c3_w ai_w = a_u->buf_w[i_w];
c3_w bi_w = b_u->buf_w[i_w];
if ( ai_w != bi_w ) {
return (ai_w < bi_w) ? 0 : 2;
}
}
return 1;
}
}
}
} else {
if ( _(u3a_is_atom(b)) ) {
return 2;
} else {
u3_atom c = u3r_nord(u3a_h(a), u3a_h(b));
if ( 1 == c ) {
return u3r_nord(u3a_t(a), u3a_t(b));
} else {
return c;
}
}
}
}
}
/* u3r_sing_c():
**
** Yes iff (b) is the same noun as the C string a_c.
*/
c3_o
u3r_sing_c(const c3_c* a_c,
u3_noun b)
{
c3_assert(u3_none != b);
if ( !_(u3a_is_atom(b)) ) {
return c3n;
}
else {
c3_w w_sof = strlen(a_c);
c3_w i_w;
if ( w_sof != u3r_met(3, b) ) {
return c3n;
}
for ( i_w = 0; i_w < w_sof; i_w++ ) {
if ( u3r_byte(i_w, b) != a_c[i_w] ) {
return c3n;
}
}
return c3y;
}
}
/* u3r_bush():
**
** Factor [a] as a bush [b.[p q] c].
*/
c3_o
u3r_bush(u3_noun a,
u3_noun* b,
u3_noun* c)
{
c3_assert(u3_none != a);
if ( _(u3a_is_atom(a)) ) {
return c3n;
}
else {
*b = u3a_h(a);
if ( _(u3a_is_atom(*b)) ) {
return c3n;
} else {
*c = u3a_t(a);
return c3y;
}
}
}
/* u3r_cell():
**
** Factor (a) as a cell (b c).
*/
c3_o
u3r_cell(u3_noun a,
u3_noun* b,
u3_noun* c)
{
c3_assert(u3_none != a);
if ( _(u3a_is_atom(a)) ) {
return c3n;
}
else {
if ( b ) *b = u3a_h(a);
if ( c ) *c = u3a_t(a);
return c3y;
}
}
/* u3r_p():
**
** & [0] if [a] is of the form [b *c].
*/
c3_o
u3r_p(u3_noun a,
u3_noun b,
u3_noun* c)
{
u3_noun feg, nux;
if ( (c3y == u3r_cell(a, &feg, &nux)) &&
(c3y == u3r_sing(feg, b)) )
{
*c = nux;
return c3y;
}
else return c3n;
}
/* u3r_pq():
**
** & [0] if [a] is of the form [b *c d].
*/
c3_o
u3r_pq(u3_noun a,
u3_noun b,
u3_noun* c,
u3_noun* d)
{
u3_noun nux;
if ( (c3y == u3r_p(a, b, &nux)) &&
(c3y == u3r_cell(nux, c, d)) )
{
return c3y;
}
else return c3n;
}
/* u3r_pqr():
**
** & [0] if [a] is of the form [b *c *d *e].
*/
c3_o
u3r_pqr(u3_noun a,
u3_noun b,
u3_noun* c,
u3_noun* d,
u3_noun* e)
{
u3_noun nux;
if ( (c3y == u3r_p(a, b, &nux)) &&
(c3y == u3r_trel(nux, c, d, e)) )
{
return c3y;
}
else return c3n;
}
/* u3r_pqrs():
**
** & [0] if [a] is of the form [b *c *d *e *f].
*/
c3_o
u3r_pqrs(u3_noun a,
u3_noun b,
u3_noun* c,
u3_noun* d,
u3_noun* e,
u3_noun* f)
{
u3_noun nux;
if ( (c3y == u3r_p(a, b, &nux)) &&
(c3y == u3r_qual(nux, c, d, e, f)) )
{
return c3y;
}
else return c3n;
}
/* u3r_trel():
**
** Factor (a) as a trel (b c d).
*/
c3_o
u3r_trel(u3_noun a,
u3_noun *b,
u3_noun *c,
u3_noun *d)
{
u3_noun guf;
if ( (c3y == u3r_cell(a, b, &guf)) &&
(c3y == u3r_cell(guf, c, d)) ) {
return c3y;
}
else {
return c3n;
}
}
/* u3r_qual():
**
** Factor (a) as a qual (b c d e).
*/
c3_o
u3r_qual(u3_noun a,
u3_noun* b,
u3_noun* c,
u3_noun* d,
u3_noun* e)
{
u3_noun guf;
if ( (c3y == u3r_cell(a, b, &guf)) &&
(c3y == u3r_trel(guf, c, d, e)) ) {
return c3y;
}
else return c3n;
}
/* u3r_quil():
**
** Factor (a) as a quil (b c d e f).
*/
c3_o
u3r_quil(u3_noun a,
u3_noun* b,
u3_noun* c,
u3_noun* d,
u3_noun* e,
u3_noun* f)
{
u3_noun guf;
if ( (c3y == u3r_cell(a, b, &guf)) &&
(c3y == u3r_qual(guf, c, d, e, f)) ) {
return c3y;
}
else return c3n;
}
/* u3r_hext():
**
** Factor (a) as a hext (b c d e f g)
*/
c3_o
u3r_hext(u3_noun a,
u3_noun* b,
u3_noun* c,
u3_noun* d,
u3_noun* e,
u3_noun* f,
u3_noun* g)
{
u3_noun guf;
if ( (c3y == u3r_cell(a, b, &guf)) &&
(c3y == u3r_quil(guf, c, d, e, f, g)) ) {
return c3y;
}
else return c3n;
}
/* u3r_met():
**
** Return the size of (b) in bits, rounded up to
** (1 << a_y).
**
** For example, (a_y == 3) returns the size in bytes.
*/
c3_w
u3r_met(c3_y a_y,
u3_atom b)
{
c3_assert(u3_none != b);
c3_assert(_(u3a_is_atom(b)));
if ( b == 0 ) {
return 0;
}
else {
/* gal_w: number of words besides (daz_w) in (b).
** daz_w: top word in (b).
*/
c3_w gal_w;
c3_w daz_w;
if ( _(u3a_is_cat(b)) ) {
gal_w = 0;
daz_w = b;
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
gal_w = (b_u->len_w) - 1;
daz_w = b_u->buf_w[gal_w];
}
switch ( a_y ) {
case 0:
case 1:
case 2: {
/* col_w: number of bits in (daz_w)
** bif_w: number of bits in (b)
*/
c3_w bif_w, col_w;
col_w = c3_bits_word(daz_w);
bif_w = col_w + (gal_w << 5);
return (bif_w + ((1 << a_y) - 1)) >> a_y;
}
case 3: {
return (gal_w << 2)
+ ((daz_w >> 24) ? 4 : (daz_w >> 16) ? 3 : (daz_w >> 8) ? 2 : 1);
}
case 4: {
return (gal_w << 1)
+ ((daz_w >> 16) ? 2 : 1);
}
default: {
c3_y gow_y = (a_y - 5);
return ((gal_w + 1) + ((1 << gow_y) - 1)) >> gow_y;
}
}
}
}
/* u3r_bit():
**
** Return bit (a_w) of (b).
*/
c3_b
u3r_bit(c3_w a_w,
u3_atom b)
{
c3_assert(u3_none != b);
c3_assert(_(u3a_is_atom(b)));
if ( _(u3a_is_cat(b)) ) {
if ( a_w >= 31 ) {
return 0;
}
else return (1 & (b >> a_w));
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
c3_y vut_y = (a_w & 31);
c3_w pix_w = (a_w >> 5);
if ( pix_w >= b_u->len_w ) {
return 0;
}
else {
c3_w nys_w = b_u->buf_w[pix_w];
return (1 & (nys_w >> vut_y));
}
}
}
/* u3r_byte():
**
** Return byte (a_w) of (b).
*/
c3_y
u3r_byte(c3_w a_w,
u3_atom b)
{
c3_assert(u3_none != b);
c3_assert(_(u3a_is_atom(b)));
if ( _(u3a_is_cat(b)) ) {
if ( a_w > 3 ) {
return 0;
}
else return (255 & (b >> (a_w << 3)));
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
c3_y vut_y = (a_w & 3);
c3_w pix_w = (a_w >> 2);
if ( pix_w >= b_u->len_w ) {
return 0;
}
else {
c3_w nys_w = b_u->buf_w[pix_w];
return (255 & (nys_w >> (vut_y << 3)));
}
}
}
/* u3r_bytes():
**
** Copy bytes (a_w) through (a_w + b_w - 1) from (d) to (c).
*/
void
u3r_bytes(c3_w a_w,
c3_w b_w,
c3_y* c_y,
u3_atom d)
{
c3_w i_w;
c3_assert(u3_none != d);
/* Efficiency: don't call u3r_byte().
*/
for ( i_w = 0; i_w < b_w; i_w++ ) {
c_y[i_w] = u3r_byte((a_w + i_w), d);
}
}
/* u3r_mp():
**
** Copy (b) into (a_mp).
*/
void
u3r_mp(mpz_t a_mp,
u3_atom b)
{
c3_assert(u3_none != b);
c3_assert(_(u3a_is_atom(b)));
if ( _(u3a_is_cat(b)) ) {
mpz_init_set_ui(a_mp, b);
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
c3_w len_w = b_u->len_w;
/* Slight deficiency in the GMP API.
*/
c3_assert(!(len_w >> 27));
mpz_init2(a_mp, len_w << 5);
/* Efficiency: horrible.
*/
{
c3_w *buf_w = alloca(len_w << 2);
c3_w i_w;
for ( i_w=0; i_w < len_w; i_w++ ) {
buf_w[i_w] = b_u->buf_w[i_w];
}
mpz_import(a_mp, len_w, -1, 4, 0, 0, buf_w);
}
}
}
/* u3r_word():
**
** Return word (a_w) of (b).
*/
c3_w
u3r_word(c3_w a_w,
u3_atom b)
{
c3_assert(u3_none != b);
c3_assert(_(u3a_is_atom(b)));
if ( _(u3a_is_cat(b)) ) {
if ( a_w > 0 ) {
return 0;
}
else return b;
}
else {
u3a_atom* b_u = u3a_to_ptr(b);
if ( a_w >= b_u->len_w ) {
return 0;
}
else return b_u->buf_w[a_w];
}
}
/* u3r_chub():
**
** Return double-word (a_w) of (b).
*/
c3_d
u3r_chub(c3_w a_w,
u3_atom b)
{
c3_w wlo_w = u3r_word(a_w * 2, b);
c3_w whi_w = u3r_word(1 + (a_w * 2), b);
return (((uint64_t)whi_w) << 32ULL) | ((uint64_t)wlo_w);
}
/* u3r_words():
**
** Copy words (a_w) through (a_w + b_w - 1) from (d) to (c).
*/
void
u3r_words(c3_w a_w,
c3_w b_w,
c3_w* c_w,
u3_atom d)
{
c3_w i_w;
c3_assert(u3_none != d);
/* Efficiency: don't call u3r_word().
*/
for ( i_w = 0; i_w < b_w; i_w++ ) {
c_w[i_w] = u3r_word((a_w + i_w), d);
}
}
/* u3r_chop():
**
** Into the bloq space of `met`, from position `fum` for a
** span of `wid`, to position `tou`, XOR from atom `src`
** into `dst_w`.
*/
void
u3r_chop(c3_g met_g,
c3_w fum_w,
c3_w wid_w,
c3_w tou_w,
c3_w* dst_w,
u3_atom src)
{
c3_w i_w;
c3_w len_w;
c3_w* buf_w;
c3_assert(u3_none != src);
c3_assert(_(u3a_is_atom(src)));
if ( _(u3a_is_cat(src)) ) {
len_w = src ? 1 : 0;
buf_w = &src;
}
else {
u3a_atom* src_u = u3a_to_ptr(src);
len_w = src_u->len_w;
buf_w = src_u->buf_w;
}
if ( met_g < 5 ) {
c3_w san_w = (1 << met_g);
c3_w mek_w = ((1 << san_w) - 1);
c3_w baf_w = (fum_w << met_g);
c3_w bat_w = (tou_w << met_g);
// XX: efficiency: poor. Iterate by words.
//
for ( i_w = 0; i_w < wid_w; i_w++ ) {
c3_w waf_w = (baf_w >> 5);
c3_g raf_g = (baf_w & 31);
c3_w wat_w = (bat_w >> 5);
c3_g rat_g = (bat_w & 31);
c3_w hop_w;
hop_w = (waf_w >= len_w) ? 0 : buf_w[waf_w];
hop_w = (hop_w >> raf_g) & mek_w;
dst_w[wat_w] ^= (hop_w << rat_g);
baf_w += san_w;
bat_w += san_w;
}
}
else {
c3_g hut_g = (met_g - 5);
c3_w san_w = (1 << hut_g);
c3_w j_w;
for ( i_w = 0; i_w < wid_w; i_w++ ) {
c3_w wuf_w = (fum_w + i_w) << hut_g;
c3_w wut_w = (tou_w + i_w) << hut_g;
for ( j_w = 0; j_w < san_w; j_w++ ) {
dst_w[wut_w + j_w] ^=
((wuf_w + j_w) >= len_w)
? 0
: buf_w[wuf_w + j_w];
}
}
}
}
/* u3r_string(): `a` as malloced C string.
*/
c3_c*
u3r_string(u3_atom a)
{
c3_w met_w = u3r_met(3, a);
c3_c* str_c = c3_malloc(met_w + 1);
u3r_bytes(0, met_w, (c3_y*)str_c, a);
str_c[met_w] = 0;
return str_c;
}
/* u3r_tape(): `a`, a list of bytes, as malloced C string.
*/
c3_y*
u3r_tape(u3_noun a)
{
u3_noun b;
c3_w i_w;
c3_y *a_y;
for ( i_w = 0, b=a; c3y == u3a_is_cell(b); i_w++, b=u3a_t(b) )
;
a_y = c3_malloc(i_w + 1);
for ( i_w = 0, b=a; c3y == u3a_is_cell(b); i_w++, b=u3a_t(b) ) {
a_y[i_w] = u3a_h(b);
}
a_y[i_w] = 0;
return a_y;
}
#if 0
/* Finalization mix for better avalanching.
*/
static c3_w
_mur_fmix(c3_w h_w)
{
h_w ^= h_w >> 16;
h_w *= 0x85ebca6b;
h_w ^= h_w >> 13;
h_w *= 0xc2b2ae35;
h_w ^= h_w >> 16;
return h_w;
}
/* _mur_words(): raw MurmurHash3 on raw words.
*/
static c3_w
_mur_words(c3_w syd_w, const c3_w* key_w, c3_w len_w)
{
c3_w goc_w = syd_w;
c3_w lig_w = 0xcc9e2d51;
c3_w duf_w = 0x1b873593;
c3_w i_w;
for ( i_w = 0; i_w < len_w; i_w++ ) {
c3_w kop_w = key_w[i_w];
kop_w *= lig_w;
kop_w = c3_rotw(15, kop_w);
kop_w *= duf_w;
goc_w ^= kop_w;
goc_w = c3_rotw(13, goc_w);
goc_w = (goc_w * 5) + 0xe6546b64;
}
goc_w ^= len_w;
goc_w = _mur_fmix(goc_w);
return goc_w;
}
/* u3_mur_words(): 31-bit nonzero MurmurHash3 on raw words.
*/
c3_w
u3_mur_words(const c3_w* key_w, c3_w len_w)
{
c3_w syd_w = 0xcafebabe;
while ( 1 ) {
c3_w haz_w = _mur_words(syd_w, key_w, len_w);
c3_w ham_w = (haz_w >> 31) ^ (haz_w & 0x7fffffff);
if ( 0 != ham_w ) return ham_w;
else syd_w++;
}
}
/* u3_mur_both():
**
** Join two murs.
*/
c3_w
u3_mur_both(c3_w lef_w, c3_w rit_w)
{
c3_w ham_w = lef_w ^ (0x7fffffff ^ rit_w);
return u3_mur_words(&ham_w, (0 == ham_w) ? 0 : 1);
}
/* u3_mur(): MurmurHash3 on a noun.
*/
c3_w
u3_mur(u3_noun veb)
{
if ( u3_fly_is_cat(veb) ) {
return u3_mur_words(&veb, (0 == veb) ? 0 : 1);
}
else {
c3_w mur_w;
if ( (mur_w=*u3_at_dog_mur(veb)) ) {
return mur_w;
}
if ( u3dog_is_pom(veb) ) {
mur_w = u3_mur_both(u3_mur(u3h(veb)), u3_mur(u3t(veb)));
}
else {
c3_w len_w = u3_met(5, veb);
c3_w* buf_w = malloc(4 * len_w);
u3_words(0, len_w, buf_w, veb);
mur_w = u3_mur_words(buf_w, len_w);
free(buf_w);
}
*u3_at_dog_mur(veb) = mur_w;
return mur_w;
}
}
/* u3_mur_string():
**
** Compute the mur of `a`, LSB first.
*/
c3_w
u3_mur_string(const c3_c *a_c)
{
c3_w len_w = strlen(a_c);
c3_w wor_w = ((len_w + 3) >> 2);
c3_w* buf_w = alloca(4 * wor_w);
c3_w i_w;
for ( i_w = 0; i_w < wor_w; i_w++ ) { buf_w[i_w] = 0; }
for ( i_w = 0; i_w < len_w; i_w++ ) {
c3_w inx_w = (i_w >> 2);
c3_w byt_w = (i_w & 3);
buf_w[inx_w] |= (a_c[i_w] << (8 * byt_w));
}
return u3_mur_words(buf_w, wor_w);
}
/* u3_mur_cell():
**
** Compute the mur of the cell `[hed tel]`.
*/
c3_w
u3_mur_cell(u3_noun hed,
u3_noun tel)
{
c3_w lus_w = u3_mur(hed);
c3_w biq_w = u3_mur(tel);
return u3_mur_both(lus_w, biq_w);
}
/* u3_mur_trel():
**
** Compute the mur of `[a b c]`.
*/
c3_w
u3_mur_trel(u3_noun a,
u3_noun b,
u3_noun c)
{
return u3_mur_both(u3_mur(a), u3_mur_both(u3_mur(b), u3_mur(c)));
}
/* u3_mur_qual():
**
** Compute the mur of `[a b c d]`.
*/
c3_w
u3_mur_qual(u3_noun a,
u3_noun b,
u3_noun c,
u3_noun d)
{
return u3_mur_both(u3_mur(a),
u3_mur_both(u3_mur(b),
u3_mur_both(u3_mur(c), u3_mur(d))));
}
#endif
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