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math.unsigned: fix rotate_left() for uint256, add test (#24872)

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Mike 2025-07-10 08:45:34 +03:00 committed by GitHub
parent e850f6c678
commit 03e72a4856
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2 changed files with 6 additions and 1 deletions
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2
vlib/math/unsigned/uint256.v
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@ -348,7 +348,7 @@ pub fn (u Uint256) rotate_left(k int) Uint256 {
return Uint256{u.hi, u.lo} return Uint256{u.hi, u.lo}
} }
return Uint256{Uint128{u.hi.lo << n | u.lo.hi >> (64 - n), u.hi.hi << n | u.hi.lo >> (64 - n)}, Uint128{}} return Uint256{Uint128{u.hi.lo << n | u.lo.hi >> (64 - n), u.hi.hi << n | u.hi.lo >> (64 - n)}, Uint128{u.lo.lo << n | u.hi.hi >> (64 - n), u.lo.hi << n | u.lo.lo >> (64 - n)}}
} }
n -= 64 n -= 64
if n == 0 { if n == 0 {

5
vlib/math/unsigned/uint256_test.v
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@ -303,3 +303,8 @@ fn test_lsh() {
assert a.lsh(200).str() == '197653379443855803891661337357963000110230968235283518742069248' assert a.lsh(200).str() == '197653379443855803891661337357963000110230968235283518742069248'
assert a.lsh(300) == unsigned.uint256_zero assert a.lsh(300) == unsigned.uint256_zero
} }
fn test_rotate_left() {
a := unsigned.uint256_from_dec_str('25514942427378518882041616545065271187265095759155217686057363902268374351523')!
assert a.rotate_left(182).str() == '88706376393829417451765793453791860419270208590599379720310994108668904859637'
}