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feat: add aritmeticRight implementation

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Patrick 2025-04-15 09:38:24 +02:00
parent c875dd77fe
commit 19b469d1b3
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3 changed files with 447 additions and 43 deletions
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24
lib/shift.nix
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@ -75,7 +75,7 @@ let
else if a == 0 then
b
else if a < 0 then
right (-a) b
throw "Inverse Left Shift not supported"
else
let
inv = 63 - a;
@ -87,14 +87,14 @@ let
result = masked * mult;
in
if !negate then result else intmin + result;
right =
logicalRight =
a: b:
if a >= 64 then
0
else if a == 0 then
b
else if a < 0 then
left (-a) b
throw "Inverse right Shift not supported"
else
let
masked = builtins.bitAnd b intmax;
@ -106,7 +106,23 @@ let
highest_bit = builtins.elemAt lut inv;
in
if !negate then result else result + highest_bit;
arithmeticRight =
a: b:
if a >= 64 then
0
else if a == 0 then
b
else if a < 0 then
throw "Inverse right Shift not supported"
else
let
negate = b < 0;
mask = if a == 63 then intmax else (builtins.elemAt lut a) - 1;
round_down = negate && (builtins.bitAnd mask b != 0);
result = (b / 2 / (builtins.elemAt lut (a - 1)));
in
if round_down then result - 1 else result;
in
{
inherit left right;
inherit left logicalRight arithmeticRight;
}