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math.big: add new .bitwise_com/0 method + tests (#24476)

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Mike 2025-05-13 23:28:57 +03:00 committed by GitHub
parent 1957162c2a
commit 861adfcc65
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2 changed files with 17 additions and 0 deletions
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6
vlib/math/big/big_test.v
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@ -813,6 +813,12 @@ fn test_bitwise_ops() {
assert b.bitwise_or(b) == b
assert b.bitwise_and(b) == b
assert b.bitwise_not() == big.zero_int
assert big.three_int.neg().bitwise_com() == big.two_int
assert big.two_int.neg().bitwise_com() == big.one_int
assert big.one_int.neg().bitwise_com() == big.zero_int
assert big.zero_int.bitwise_com() == big.one_int.neg()
assert big.one_int.bitwise_com() == big.two_int.neg()
assert big.two_int.bitwise_com() == big.three_int.neg()
}
fn test_get_bit() {

11
vlib/math/big/integer.v
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@ -743,6 +743,17 @@ pub fn (a Integer) bitwise_not() Integer {
}
}
// bitwise_com returns "bitwise complement" of integer `a`.
//
// Note: this function consider the sign of the input.
pub fn (a Integer) bitwise_com() Integer {
return if a.signum == -1 {
a.abs() - one_int
} else {
(a + one_int).neg()
}
}
// bitwise_xor returns the "bitwise exclusive or" of the integers `|a|` and `|b|`.
//
// Note: both operands are treated as absolute values.