Fix BigInteger.LeadingZeroCount, PopCount, TrailingZeroCount, RotateLeft, and RotateRight for platform-independent 32-bit word semantics#126259

Merged

tannergooding merged 22 commits intomainfrom

copilot/fix-leading-zero-count-implementation

Apr 25, 2026

Commits on Mar 29, 2026

Fix RotateLeft/RotateRight _sign path for 32-bit word semantics and update tests

Copilot
and
stephentoub
authored
Fix Rotate _bits path for 32-bit word semantics and update tests

Copilot
and
stephentoub
authored
Fix SwapUpperAndLower32 to use ArrayPool, simplify zLimbCount, remove accidental dotnet-tools.json

Copilot
and
stephentoub
authored
Fix Rotate endianness: replace MemoryMarshal.Cast with arithmetic word extraction

Copilot
and
stephentoub
authored
Remove dead nuint-based Rotate helpers, avoid Array.Resize in Rotate

Copilot
and
stephentoub
authored
Use IndexOfAnyExcept for first-non-zero word search in Rotate

Copilot
and
stephentoub
authored
Update src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs

stephentoub
and
jkotas
authored
Optimize Rotate() to avoid temporary uint[] array allocation

Copilot
and
stephentoub
authored
Add SIMD (Vector128/256/512) optimizations to LeftShiftSelf32/RightShiftSelf32

Copilot
and
stephentoub
authored

Commits on Mar 30, 2026

Commits on Apr 21, 2026