Created repo

Author: chriselrod

README.md

@@ -1,6 +1,6 @@
 # BitTwiddlingConvenienceFunctions
 
-[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://chriselrod.github.io/BitTwiddlingConvenienceFunctions.jl/stable)
-[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://chriselrod.github.io/BitTwiddlingConvenienceFunctions.jl/dev)
-[![Build Status](https://github.com/chriselrod/BitTwiddlingConvenienceFunctions.jl/workflows/CI/badge.svg)](https://github.com/chriselrod/BitTwiddlingConvenienceFunctions.jl/actions)
-[![Coverage](https://codecov.io/gh/chriselrod/BitTwiddlingConvenienceFunctions.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/chriselrod/BitTwiddlingConvenienceFunctions.jl)
+[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaSIMD.github.io/BitTwiddlingConvenienceFunctions.jl/stable)
+[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://JuliaSIMD.github.io/BitTwiddlingConvenienceFunctions.jl/dev)
+[![Build Status](https://github.com/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl/workflows/CI/badge.svg)](https://github.com/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl/actions)
+[![Coverage](https://codecov.io/gh/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl)

docs/make.jl

@@ -6,11 +6,11 @@ DocMeta.setdocmeta!(BitTwiddlingConvenienceFunctions, :DocTestSetup, :(using Bit
 makedocs(;
     modules=[BitTwiddlingConvenienceFunctions],
     authors="Julia Computing",
-    repo="https://github.com/chriselrod/BitTwiddlingConvenienceFunctions.jl/blob/{commit}{path}#{line}",
+    repo="https://github.com/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl/blob/{commit}{path}#{line}",
     sitename="BitTwiddlingConvenienceFunctions.jl",
     format=Documenter.HTML(;
         prettyurls=get(ENV, "CI", "false") == "true",
-        canonical="https://chriselrod.github.io/BitTwiddlingConvenienceFunctions.jl",
+        canonical="https://JuliaSIMD.github.io/BitTwiddlingConvenienceFunctions.jl",
         assets=String[],
     ),
     pages=[
@@ -19,6 +19,6 @@ makedocs(;
 )
 
 deploydocs(;
-    repo="github.com/chriselrod/BitTwiddlingConvenienceFunctions.jl",
+    repo="github.com/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl",
     devbranch="main",
 )

docs/src/index.md

@@ -4,7 +4,7 @@ CurrentModule = BitTwiddlingConvenienceFunctions
 
 # BitTwiddlingConvenienceFunctions
 
-Documentation for [BitTwiddlingConvenienceFunctions](https://github.com/chriselrod/BitTwiddlingConvenienceFunctions.jl).
+Documentation for [BitTwiddlingConvenienceFunctions](https://github.com/JuliaSIMD/BitTwiddlingConvenienceFunctions.jl).
 
 ```@index
 ```

src/BitTwiddlingConvenienceFunctions.jl

@@ -1,5 +1,14 @@
 module BitTwiddlingConvenienceFunctions
 
-# Write your package code here.
+using Static
+
+intlog2(N::I) where {I <: Integer} = (8sizeof(I) - one(I) - leading_zeros(N)) % I
+intlog2(::Type{T}) where {T} = intlog2(sizeof(T))
+nextpow2(W::T) where {T<:Base.BitInteger} = (one(T) << (T(8sizeof(W)) - leading_zeros((W - one(T)))))
+prevpow2(W::T) where {T<:Base.BitInteger} = (one(T) << (((T(8sizeof(W))) - one(T)) - leading_zeros(W)))
+@generated nextpow2(::StaticInt{N}) where {N} = Expr(:call, Expr(:curly, :StaticInt, nextpow2(N)))
+@generated prevpow2(::StaticInt{N}) where {N} = Expr(:call, Expr(:curly, :StaticInt, prevpow2(N)))
+@generated intlog2(::StaticInt{N}) where {N} = Expr(:call, Expr(:curly, :StaticInt, intlog2(N)))
+
 
 end

test/runtests.jl

@@ -1,6 +1,13 @@
-using BitTwiddlingConvenienceFunctions
+using BitTwiddlingConvenienceFunctions: intlog2, nextpow2, prevpow2
 using Test
 
 @testset "BitTwiddlingConvenienceFunctions.jl" begin
-    # Write your tests here.
+
+  @test all(i ->  HostCPUFeatures.intlog2(1 << i) == i, 0:(Int == Int64 ? 53 : 30))
+  @test all(i -> HostCPUFeatures.nextpow2(i) == i, 0:2)
+  for j in 1:10
+    l, u = (1<<j)+1, 1<<(j+1)
+    @test all(i -> HostCPUFeatures.nextpow2(i) == u, l:u)
+  end
+
 end