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math.big: fix Karatsuba's add_in_place() function, add carry handler on exit (#24541)

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Mike 2025-05-21 13:54:21 +03:00 committed by GitHub
parent 717deacf52
commit c27bc602bd
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3 changed files with 13 additions and 0 deletions
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1
vlib/math/big/big_test.v
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File diff suppressed because one or more lines are too long

3
vlib/math/big/special_array_ops.v
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@ -298,6 +298,9 @@ fn add_in_place(mut a []u32, b []u32) {
carry = u32(partial >> 32) carry = u32(partial >> 32)
} }
} }
if carry > 0 {
a << u32(carry)
}
} }
// a := a - b supposed a >= b // a := a - b supposed a >= b

9
vlib/math/big/special_array_ops_test.v
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@ -90,6 +90,15 @@ fn test_multiply_karatsuba_02() {
assert c == expected.digits assert c == expected.digits
} }
fn test_multiply_karatsuba_03() {
a := integer_from_string('9729117383001812976929423642') or { panic(err) }
b := integer_from_string('36889625830') or { panic(err) }
mut c := []u32{len: a.digits.len + b.digits.len + 1, init: 0}
karatsuba_multiply_digit_array(a.digits, b.digits, mut c)
expected := integer_from_string('358903499915085682930564860470935872860') or { panic(err) }
assert c == expected.digits
}
fn test_newton_divide_03() { fn test_newton_divide_03() {
a := [u32(0), 4] a := [u32(0), 4]
b := [u32(0), 1] b := [u32(0), 1]