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FastFloat16sr with && return 0 #38

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merged 1 commit into from Feb 17, 2021
Merged

FastFloat16sr with && return 0 #38

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7 changes: 4 additions & 3 deletions src/fast_float16sr.jl
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Expand Up @@ -54,14 +54,15 @@ Base.Float64(x::FastFloat16sr) = Float64(Float32(x))
FastFloat16sr(x::Integer) = FastFloat16sr(Float32(x))
(::Type{T})(x::FastFloat16sr) where {T<:Integer} = T(Float32(x))

const minpos_half_f16_asInt32 = reinterpret(Int32,Float32(nextfloat(zero(Float16)))/2)
const minpos_f16_asInt32 = reinterpret(Int32,Float32(nextfloat(zero(Float16))))
const ssmask = reinterpret(UInt32,0x7f80_0000)

"""Convert to FastFloat16sr from Float32 with stochastic rounding.
Binary arithmetic version."""
function FastFloat16_stochastic_round(x::Float32)
xi = reinterpret(Int32,x)
s = ((xi & setsignzero - minpos_half_f16_asInt32) >> 31) + Int32(1)
xr = reinterpret(Float32,s*(xi + rand(Xor128[],Int32) >> 19))
(xi & ssmask) < minpos_f16_asInt32 && return zero(FastFloat16sr)
xr = reinterpret(Float32,xi + rand(Xor128[],Int32) >> 19)
return FastFloat16sr(xr)
end

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