Skip to content

⚡ Bolt: Optimize Decompression for Offset 25 #381

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
404Setup merged 1 commit into from
Feb 24, 2026
Merged

⚡ Bolt: Optimize Decompression for Offset 25 #381

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 22 additions & 0 deletions src/decompress/x86.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -442,6 +442,28 @@ unsafe fn decompress_offset_alignr_cycle<const SHIFT: i32>(
_mm_storeu_si128(out_next.add(copied + 64) as *mut __m128i, v_next4);
_mm_storeu_si128(out_next.add(copied + 80) as *mut __m128i, v_next5);

v_prev = v_next5;
v_align = v_next4;
copied += 96;
}
} else if SHIFT == 7 {
// Optimization for Offset 25 (Shift 7): Unroll loop to write 96 bytes (6 vectors) per iteration.
while copied + 96 <= length {
let v_next0 = _mm_alignr_epi8::<7>(v_prev, v_align);
let v_next1 = _mm_alignr_epi8::<7>(v_next0, v_prev);

let v_next2 = _mm_alignr_epi8::<14>(v_prev, v_align);
let v_next3 = _mm_alignr_epi8::<14>(v_next0, v_prev);
let v_next4 = _mm_alignr_epi8::<14>(v_next1, v_next0);
let v_next5 = _mm_alignr_epi8::<14>(v_next2, v_next1);

_mm_storeu_si128(out_next.add(copied) as *mut __m128i, v_next0);
_mm_storeu_si128(out_next.add(copied + 16) as *mut __m128i, v_next1);
_mm_storeu_si128(out_next.add(copied + 32) as *mut __m128i, v_next2);
_mm_storeu_si128(out_next.add(copied + 48) as *mut __m128i, v_next3);
_mm_storeu_si128(out_next.add(copied + 64) as *mut __m128i, v_next4);
_mm_storeu_si128(out_next.add(copied + 80) as *mut __m128i, v_next5);

v_prev = v_next5;
v_align = v_next4;
copied += 96;
Expand Down