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Round without overflow (Fix #59) #64

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Merged
merged 1 commit into from
Mar 27, 2018
Merged

Round without overflow (Fix #59) #64

merged 1 commit into from
Mar 27, 2018

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@jmkuhn
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@jmkuhn jmkuhn commented Mar 26, 2018

Fixes #59

julia> @sprintf("%e", realmin(Dec64))
"1.000000e-398"

julia> realmax(Dec64)
9.999999999999999e384

julia> @sprintf("%e", realmax(Dec64))
"1.000000e+385"

I uncommented the definitions for exponent and ldexp and renamed to exponent10 and ldexp10 to avoid confusion with Base exponent and ldexp. I like the name scale10 better than ldexp10. Do you have a preference on this? I am currently using these within DecFP.jl but not exporting them. I also defined tostring to wrap the library's to_string. I welcome a better name for this.

stevengj
stevengj reviewed Mar 26, 2018
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src/DecFP.jl
# Base.exponent(x::$BID) = nox(ccall(($(bidsym(w,"ilogb")), libbid), Cint, ($BID,), x))
# Base.ldexp(x::$BID, n::Integer) = nox(ccall(($(bidsym(w,"ldexp")), libbid), $BID, ($BID,Cint), x, n))
exponent10(x::$BID) = nox(ccall(($(bidsym(w,"ilogb")), libbid), Cint, ($BID,), x))
ldexp10(x::$BID, n::Integer) = nox(ccall(($(bidsym(w,"ldexp")), libbid), $BID, ($BID,Cint), x, n))
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@stevengj stevengj Mar 26, 2018

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Should these be exported?

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@stevengj stevengj Mar 26, 2018

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Maybe in a separate PR.

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@jmkuhn jmkuhn Mar 26, 2018

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OK. I'll export these in a separate PR.

@stevengj stevengj merged commit dfddeec into JuliaMath:master Mar 27, 2018
@jmkuhn jmkuhn deleted the roundoverflow branch March 27, 2018 21:11
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@jmkuhn @stevengj