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fix: libnet usage

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fix: use list for lookuptable for speeeeeeeeeeeeeeeeeeeeeed
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Patrick 2025-04-12 21:53:17 +02:00
parent 32f790ae7f
commit 0875c4f06e
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2 changed files with 87 additions and 87 deletions
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140
lib/netu.nix
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@ -460,71 +460,71 @@ let
bit =
let
lut = {
"0" = 1;
"1" = 2;
"2" = 4;
"3" = 8;
"4" = 16;
"5" = 32;
"6" = 64;
"7" = 128;
"8" = 256;
"9" = 512;
"10" = 1024;
"11" = 2048;
"12" = 4096;
"13" = 8192;
"14" = 16384;
"15" = 32768;
"16" = 65536;
"17" = 131072;
"18" = 262144;
"19" = 524288;
"20" = 1048576;
"21" = 2097152;
"22" = 4194304;
"23" = 8388608;
"24" = 16777216;
"25" = 33554432;
"26" = 67108864;
"27" = 134217728;
"28" = 268435456;
"29" = 536870912;
"30" = 1073741824;
"31" = 2147483648;
"32" = 4294967296;
"33" = 8589934592;
"34" = 17179869184;
"35" = 34359738368;
"36" = 68719476736;
"37" = 137438953472;
"38" = 274877906944;
"39" = 549755813888;
"40" = 1099511627776;
"41" = 2199023255552;
"42" = 4398046511104;
"43" = 8796093022208;
"44" = 17592186044416;
"45" = 35184372088832;
"46" = 70368744177664;
"47" = 140737488355328;
"48" = 281474976710656;
"49" = 562949953421312;
"50" = 1125899906842624;
"51" = 2251799813685248;
"52" = 4503599627370496;
"53" = 9007199254740992;
"54" = 18014398509481984;
"55" = 36028797018963968;
"56" = 72057594037927936;
"57" = 144115188075855872;
"58" = 288230376151711744;
"59" = 576460752303423488;
"60" = 1152921504606846976;
"61" = 2305843009213693952;
"62" = 4611686018427387904;
};
lut = [
1 # 0
2 # 1
4 # 2
8 # 3
16 # 4
32 # 5
64 # 6
128 # 7
256 # 8
512 # 9
1024 # 10
2048 # 11
4096 # 12
8192 # 13
16384 # 14
32768 # 15
65536 # 16
131072 # 17
262144 # 18
524288 # 19
1048576 # 20
2097152 # 21
4194304 # 22
8388608 # 23
16777216 # 24
33554432 # 25
67108864 # 26
134217728 # 27
268435456 # 28
536870912 # 29
1073741824 # 30
2147483648 # 31
4294967296 # 32
8589934592 # 33
17179869184 # 34
34359738368 # 35
68719476736 # 36
137438953472 # 37
274877906944 # 38
549755813888 # 39
1099511627776 # 40
2199023255552 # 41
4398046511104 # 42
8796093022208 # 43
17592186044416 # 44
35184372088832 # 45
70368744177664 # 46
140737488355328 # 47
281474976710656 # 48
562949953421312 # 49
1125899906842624 # 50
2251799813685248 # 51
4503599627370496 # 52
9007199254740992 # 53
18014398509481984 # 54
36028797018963968 # 55
72057594037927936 # 56
144115188075855872 # 57
288230376151711744 # 58
576460752303423488 # 59
1152921504606846976 # 60
2305843009213693952 # 61
4611686018427387904 # 62
];
intmin = (-9223372036854775807) - 1;
intmax = 9223372036854775807;
left =
@ -539,11 +539,11 @@ let
else
let
inv = 63 - a;
mask = if inv == 63 then intmax else lut.${toString inv} - 1;
mask = if inv == 63 then intmax else (builtins.elemAt lut inv) - 1;
masked = and b mask;
checker = if inv == 63 then intmin else lut.${toString inv};
checker = if inv == 63 then intmin else builtins.elemAt lut inv;
negate = (and b checker) != 0;
mult = if a == 63 then intmin else lut.${toString a};
mult = if a == 63 then intmin else builtins.elemAt lut a;
result = masked * mult;
in
if !negate then result else intmin + result;
@ -560,9 +560,9 @@ let
let
masked = and b intmax;
negate = b < 0;
result = masked / lut.${toString a};
result = masked / 2 / (builtins.elemAt lut (a - 1));
inv = 63 - a;
highest_bit = lut.${toString inv};
highest_bit = builtins.elemAt lut inv;
in
if !negate then result else result + highest_bit;