Feature/avx512 excess

[Malkovsky]

Implementation of excess via AVX-512

[kilo-code-bot]

WARNING: PIXIE_AVX512GFNI_SUPPORT can enable a code path that requires VBMI intrinsics

The excess_interleave_masks_gfni implementation uses _mm512_permutexvar_epi8, which requires AVX-512 VBMI. This macro gate currently checks __GFNI__ but not __AVX512VBMI__, so builds with GFNI enabled but VBMI disabled can fail to compile. Please include __AVX512VBMI__ in the feature gate (or avoid VBMI-only intrinsics in this path).

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• include/pixie/bits.h

---

_{Reviewed by gpt-5.3-codex · 354,413 tokens}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.40%. Comparing base (afe4b2e) to head (0bd066f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   87.29%   87.40%   +0.10%     
==========================================
  Files          12       12              
  Lines        3118     3136      +18     
  Branches      612      607       -5     
==========================================
+ Hits         2722     2741      +19     
+ Misses        260      259       -1     
  Partials      136      136              

Flag	Coverage Δ
gcov	87.40% <ø> (+0.10%)	⬆️

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