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add logabstanh fast paths for Float32, Float64 #106

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add logabstanh fast paths for Float32, Float64 #106

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eb7c5f4
add `logabstanh` fast paths for `Float32`, `Float64`
oscardssmith Aug 22, 2025
b0ae0b1
Update src/basicfuns.jl
oscardssmith Aug 22, 2025
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15 changes: 15 additions & 0 deletions src/basicfuns.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -231,6 +231,21 @@ function logabstanh(x::Real)
end
end

function logabstanh(x::Float32)
a = abs(x)
if a < 0.0625f0
return log(a) - (1/3f0) * a^2
end
return log1p(-2/(exp(2*a)+1))
end
function logabstanh(x::Float64)
a = abs(x)
if a < 0x1p-5
return log(a) + evalpoly(a*a, (0, -1/3, 7/90, -62/2835))
end
return log1p(-2/(exp(2*a)+1))
end

"""
$(SIGNATURES)

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