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Bithack optimizations, why not.

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It saves a branch and a (possibly inlined) function call, but it also
halves the runtime.
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Bert Peters
2018-12-05 22:37:22 +01:00
parent f426e7067a
commit f3d0297da5
1 changed files with 1 additions and 1 deletions
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2
2018/src/day05.rs
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@@ -13,7 +13,7 @@ impl Day05 {
fn reduce(mut data: Vec<u8>) -> usize { fn reduce(mut data: Vec<u8>) -> usize {
let mut dptr = 0; let mut dptr = 0;
for iptr in 0..data.len() { for iptr in 0..data.len() {
if dptr > 0 && (data[iptr].eq_ignore_ascii_case(&data[dptr - 1])) && data[iptr] != data[dptr - 1] { if dptr > 0 && (data[iptr] ^ data[dptr - 1]) == 32 {
dptr -= 1; dptr -= 1;
} else { } else {
data[dptr] = data[iptr]; data[dptr] = data[iptr];