Use Base defs of eps

Author: JeffFessler

src/float8.jl

@@ -32,8 +32,8 @@ n_significant_bits(::Type{Float8_4}) = 3
 bias(::Type{Float8}) = 3
 bias(::Type{Float8_4}) = 7
 
-eps(::Type{Float8}) = Float8(0x02)
-eps(::Type{Float8_4}) = Float8_4(0x20)
+eps(x::AbstractFloat8) = max(x-prevfloat(x), nextfloat(x)-x)
+eps(::Type{T}) where T <: AbstractFloat8 = eps(one(T))
 
 # define inifinities and nan
 inf8(::Type{Float8}) = Float8(0x70)

test/runtests.jl

@@ -251,7 +251,10 @@ end
     @test Inf8_4 == nextfloat(Inf8_4)
     @test -floatmax(Float8_4) == nextfloat(-Inf8_4)
 
-    @test eps(Float8) == nextfloat(Float8(1)) - Float8(1)
+    for T in (Float8, Float8_4)
+        @test eps(T) == nextfloat(T(1)) - T(1)
+        @test eps(one(T)) == eps(T)
+    end
 end
 
 @testset "Prevfloat" begin