kalmar/Groups.jl
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fix error in packed Int4 pair

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Marek Kaluba 2021-06-28 09:29:32 +02:00
parent 5ede922ab8
commit f438d0483b
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GPG Key ID: 8BF1A3855328FC15
1 changed files with 10 additions and 15 deletions
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25
src/groups/transvections.jl
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@ -5,27 +5,21 @@ struct Transvection <: GSymbol
function Transvection(id::Symbol, i::Integer, j::Integer, inv = false) function Transvection(id::Symbol, i::Integer, j::Integer, inv = false)
@assert id in (:ϱ, :λ) @assert id in (:ϱ, :λ)
return new(id, _indices(UInt8(i), UInt8(j)), inv) @boundscheck @assert 0 < i <= (typemax(UInt8) >> 4)
@boundscheck @assert 0 < j <= (typemax(UInt8) >> 4)
return new(id, (convert(UInt8, i) << 4) + convert(UInt8, j), inv)
end end
end end
ϱ(i, j) = Transvection(:ϱ, i, j) ϱ(i, j) = Transvection(:ϱ, i, j)
λ(i, j) = Transvection(:λ, i, j) λ(i, j) = Transvection(:λ, i, j)
_indices(ij::UInt8) = (ij & 0xf0) >> 4, (ij & 0x0f) _tophalf(ij::UInt8) = (ij & 0xf0) >> 4
_bothalf(ij::UInt8) = (ij & 0x0f)
function _indices(i::UInt8, j::UInt8)
@boundscheck @assert i < typemax(i) ÷ 2
@boundscheck @assert j < typemax(j) ÷ 2
sizeof
return (i << 4) + j
end
indices(t::Transvection) = Int.(_indices(t.ij))
function Base.getproperty(t::Transvection, s::Symbol) function Base.getproperty(t::Transvection, s::Symbol)
s === :i && return first(indices(t)) s === :i && return _tophalf(t.ij)
s === :j && return last(indices(t)) s === :j && return _bothalf(t.ij)
return Core.getfield(t, s) return Core.getfield(t, s)
end end
@ -39,14 +33,15 @@ function Base.show(io::IO, t::Transvection)
t.inv && print(io, "^-1") t.inv && print(io, "^-1")
end end
Base.inv(t::Transvection) = Transvection(t.id, _indices(t.ij)..., !t.inv) Base.inv(t::Transvection) =
Transvection(t.id, _tophalf(t.ij), _bothalf(t.ij), !t.inv)
Base.:(==)(t::Transvection, s::Transvection) = Base.:(==)(t::Transvection, s::Transvection) =
t.id === s.id && t.ij == s.ij && t.inv == s.inv t.id === s.id && t.ij == s.ij && t.inv == s.inv
Base.hash(t::Transvection, h::UInt) = hash(t.id, hash(t.ij, hash(t.inv, h))) Base.hash(t::Transvection, h::UInt) = hash(t.id, hash(t.ij, hash(t.inv, h)))
Base.@propagate_inbounds function evaluate!(v::NTuple{T, N}, t::Transvection, A::Alphabet, tmp=one(first(v))) where {T, N} Base.@propagate_inbounds function evaluate!(v::NTuple{T, N}, t::Transvection, A::Alphabet, tmp=one(first(v))) where {T, N}
i, j = indices(t) i, j = t.i, t.j
@assert i ≤ length(v) && j ≤ length(v) @assert i ≤ length(v) && j ≤ length(v)
@inbounds begin @inbounds begin