Faster bit selection

This commit is contained in:
Marshall Lochbaum 2022-11-29 11:29:25 -05:00
parent dc6e49b289
commit c17448ed71

View File

@ -100,8 +100,7 @@ B select_c2(B t, B w, B x) {
for (usz i = wia; ; ) { \
i--; \
usz n = WRAP(wp[i], xia, thrF("⊏: Indexing out-of-bounds (%i∊𝕨, %s≡≠𝕩)", wp[i], xia)); \
b <<= 1; \
b |= (-(xp[n/64] & (1ull<<(n%64)))) >> 63; \
b = 2*b + ((((u8*)xp)[n/8] >> (n%8)) & 1); \
if (i%64 == 0) { rp[i/64]=b; if (!i) break; } \
} \
goto dec_ret; \