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nora 2024-12-04 22:24:49 +01:00
parent 5627d5ac60
commit 605c03b4a6
1 changed files with 9 additions and 12 deletions
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21
2024/day04/src/lib.rs
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@ -511,10 +511,10 @@ fn part2_reading(input: &str) -> u64 {
let mut i = 0;
let combinations = x86_64::_mm256_set_epi64x(
XMAS_COMBINATIONS[0].0 as i64,
XMAS_COMBINATIONS[1].0 as i64,
XMAS_COMBINATIONS[2].0 as i64,
XMAS_COMBINATIONS[3].0 as i64,
XMAS_COMBINATIONS[2].0 as i64,
XMAS_COMBINATIONS[1].0 as i64,
XMAS_COMBINATIONS[0].0 as i64,
);
while i < end {
@ -539,16 +539,13 @@ fn part2_reading(input: &str) -> u64 {
let eq = x86_64::_mm256_cmpeq_epi64(to_test, combinations);
let movmask = x86_64::_mm256_movemask_epi8(eq) as u32;
let movmask = x86_64::_mm256_movemask_epi8(eq);
if movmask != 0 {
let masked_selected = u32::from_be_bytes([
XMAS_COMBINATIONS[0].1,
XMAS_COMBINATIONS[1].1,
XMAS_COMBINATIONS[2].1,
XMAS_COMBINATIONS[3].1,
]) & movmask;
let check = masked_selected >> masked_selected.trailing_zeros();
count += (check as u8 == ((chunk_bot >> 16) & 0xFF) as u8) as u64;
let check =
XMAS_COMBINATIONS[((movmask as u32).trailing_zeros() / 8) as usize].1;
if check == ((chunk_bot >> 16) & 0xFF) as u8 {
count += 1;
}
}
i += 1;