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Added abs_diff for integer types. by orlp · Pull Request #88780 · rust-lang/rust...
source link: https://github.com/rust-lang/rust/pull/88780
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Does either of these compile to a psadbw (or equivalent SSE/AVX instructions for wider arrays) on x86?
fn sad_iter(a: &[u8; 8], b: &[u8; 8]) -> u32 {
a.iter().zip(b).map(|&a, &b| a.abs_diff(b) as u32).sum()
}
fn sad_loop(a: &[u8; 8], b: &[u8; 8]) -> u32 {
let mut sum = 0;
for i in 0..a.len() {
sum += a[i].abs_diff(b[i]) as u32;
}
sum
}llvm does have some pattern detection to generate psadbw, so we should make sure we fall into that.
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