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sha1dc: offer accelerated C and Rust backends - #6508

Draft

dscho wants to merge 14 commits into

git-for-windows:mainfrom

dscho:integrate-sha1dc-gfw

Draft

sha1dc: offer accelerated C and Rust backends#6508
dscho wants to merge 14 commits into
git-for-windows:mainfrom
dscho:integrate-sha1dc-gfw

Commits on Oct 13, 2026
- sha1dc-accel: add a block loop for sha1dc's SHA1_CTX
  
  schacon
  authored and
  dscho
  committed
  47a54be
- sha1dc-accel: vectorize the unavoidable-bitconditions check
  
  schacon
  authored and
  dscho
  committed
  efba9dd
- sha1dc-accel: compress with SHA-NI on x86-64
  
  schacon
  authored and
  dscho
  committed
  df7afbf
- sha1dc-accel: compress with the ARMv8 SHA-1 instructions
  
  schacon
  authored and
  dscho
  committed
  68f9a22
Commits on Oct 17, 2026
- sha1dc-accel: bring SHA-NI performance closer to Rust
  dscho
  committed
  70e4f2e
- fixup! sha1dc-accel: compress with the ARMv8 SHA-1 instructions
  dscho
  committed
  a9694b6
Commits on Oct 18, 2026
- fixup! sha1dc-accel: vectorize the unavoidable-bitconditions check
  dscho
  committed
  0a2f846
- libgitcore: add `sha1dc` as an optional feature
  dscho
  committed
  6c14254
- sha1dc: allow selecting the C backend without rebuilding
  dscho
  committed
  ec24f88
- pthread: provide `pthread_once()` shims for Windows and for NO_PTHREADS
  dscho
  committed
  8c60b61
- sha1dc: make `sha1dc_init()` thread-safe
  dscho
  committed
  6eab38f
- fixup! sha1dc: make `sha1dc_init()` thread-safe
  dscho
  committed
  7d83db6
- sha1dc: avoid boxing the Rust hasher
  dscho
  committed
  0df4690
- sha1dc: keep original C as default with runtime alternatives
  dscho
  committed
  d619ab7