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Informational 18 Bitcoin

hashes: fold 8-way AVX2 SHA256d into round! macro

Public commit record

What the developer wrote

Authored by jrakibi

68/100 · Adequate
hashes: fold 8-way AVX2 SHA256d into round! macro

use a round! macro to cut ~1060 lines from the unrolled version.
each round becomes a single round!(...) call that almost matches
Core's Transform_8way line-by-line, so it's easy to compare and
review against sha256_avx2.cpp.

refactor, no behavior change.
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
The short version

What changed, and why it matters

This commit is a code cleanup in the SHA-256 hashing implementation. It replaces roughly 1,000 lines of manually repeated hashing steps with a few short macros that generate the same instructions. The author explicitly states there is no behavior change, and the diff only restructures existing operations without altering constants, math, or control flow.

Recommended action

No security action needed. Treat as normal code-quality review; verify via existing SHA-256 test vectors if desired.

Security signals we found

01

Pure refactor with no functional change claimed by commit message

02

No new unsafe code or input handling introduced

03

Constants and SIMD operations preserved exactly from prior implementation

Risk score

Why this scored 18/100

Our methodology →
Potential impact 0/30
Exploitability 0/25
Stealth signal 0/15
Affected reach 5/15
Confidence 9/10
Evidence quality 4/5
Human-validated context

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