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use road stack instead of heap vector in reel

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This commit is contained in:
Paul Driver 2020-08-24 15:01:02 -07:00
parent 6125ac4fe4
commit 8bc148acc3
1 changed files with 11 additions and 20 deletions
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31
pkg/urbit/jets/b/reel.c
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@ -12,34 +12,25 @@
u3_noun pro = u3k(u3x_at(u3x_sam_3, b));
if ( u3_nul != a ) {
u3j_site sit_u;
u3_noun* top;
u3_noun i, t = a;
c3_w j_w, len_w = 0, all_w = 89, pre_w = 55;
u3_noun* vec = u3a_malloc(all_w * sizeof(u3_noun));
c3_w len_w = 0;
// stuff list into an array
// push list onto road stack
do {
if ( c3n == u3r_cell(t, &i, &t) ) {
u3a_free(vec);
return u3m_bail(c3__exit);
}
else {
if ( len_w == all_w ) {
// grow vec fib-wise
all_w += pre_w;
pre_w = len_w;
vec = u3a_realloc(vec, all_w * sizeof(u3_noun));
}
vec[len_w++] = i;
}
u3x_cell(t, &i, &t);
top = (c3_w*) u3a_push(sizeof(u3_noun));
*top = i;
++len_w;
} while ( u3_nul != t );
// now we can iterate backwards
u3j_gate_prep(&sit_u, u3k(b));
for ( j_w = len_w; j_w > 0; ) {
pro = u3j_gate_slam(&sit_u, u3nc(u3k(vec[--j_w]), pro));
while ( len_w-- > 0 ) {
top = u3a_peek(sizeof(u3_noun));
u3a_pop(sizeof(u3_noun));
pro = u3j_gate_slam(&sit_u, u3nc(u3k(*top), pro));
}
u3j_gate_lose(&sit_u);
u3a_free(vec);
}
return pro;
}