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Pipe ceil, trunc and floor through round #200

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Pipe ceil, trunc and floor through round #200

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33 changes: 13 additions & 20 deletions src/DecFP.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -473,9 +473,6 @@ for w in (32,64,128)
end
end

for (f,c) in ((:trunc,"round_integral_zero"), (:floor,"round_integral_negative"), (:ceil,"round_integral_positive"))
@eval Base.$f(x::$BID) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,c)), libbid), $BID, ($BID,Ref{Cuint}), x, flags), flags[], DomainError, x, mask=INVALID))
end
@eval Base.:-(x::$BID) = ccall(($(bidsym(w,"negate")), libbid), $BID, ($BID,), x)
@eval Base.round(x::$BID) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"nearbyint")), libbid), $BID, ($BID,Cuint,Ref{Cuint}), x, _roundingmode(), flags), flags[], DomainError, x, mask=INVALID))

Expand Down Expand Up @@ -548,9 +545,9 @@ for w in (32,64,128)
for (i′, i′str) in (("Int$w′", "int$w′"), ("UInt$w′", "uint$w′"))
Ti′ = eval(Symbol(i′))
@eval begin
Base.trunc(::Type{$Ti′}, x::$BID) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xint")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :trunc, $BID, x, mask=INVALID | OVERFLOW))
Base.floor(::Type{$Ti′}, x::$BID) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xfloor")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :floor, $BID, x, mask=INVALID | OVERFLOW))
Base.ceil(::Type{$Ti′}, x::$BID) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xceil")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :ceil, $BID, x, mask=INVALID | OVERFLOW))
Base.round(::Type{$Ti′}, x::$BID, ::RoundingMode{:ToZero}) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xint")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :trunc, $BID, x, mask=INVALID | OVERFLOW))
Base.round(::Type{$Ti′}, x::$BID, ::RoundingMode{:Down}) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xfloor")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :floor, $BID, x, mask=INVALID | OVERFLOW))
Base.round(::Type{$Ti′}, x::$BID, ::RoundingMode{:Up}) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xceil")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :ceil, $BID, x, mask=INVALID | OVERFLOW))
Base.round(::Type{$Ti′}, x::$BID, ::RoundingMode{:NearestTiesAway}) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xrninta")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :round, $BID, x, mask=INVALID | OVERFLOW))
Base.$(Symbol("$Ti′"))(x::$BID) = (x::$BID) = (flags = Ref(zero(Cuint)); @xchk(ccall(($(bidsym(w,"to_",i′str,"_xfloor")), libbid), $Ti′, ($BID,Ref{Cuint}), x, flags), flags[], InexactError, :convert, $BID, x))
end
Expand All @@ -568,17 +565,16 @@ end # widths w

Base.round(x::DecimalFloatingPoint, ::RoundingMode{:FromZero}) = signbit(x) ? floor(x) : ceil(x)

for (f) in (:trunc, :floor, :ceil)
@eval Base.$f(::Type{Signed}, x::DecimalFloatingPoint) = $f(Int, x)
@eval Base.$f(::Type{Unsigned}, x::DecimalFloatingPoint) = $f(UInt, x)
@eval Base.$f(::Type{Integer}, x::DecimalFloatingPoint) = $f(Int, x)

@eval function Base.$f(::Type{I}, x::DecimalFloatingPoint) where {I<:Integer}
x′ = $f(x)
typemin(I) <= x′ <= typemax(I) || throw(InexactError(Symbol($f), I, x))
_, s, e = sigexp(x′)
return I(flipsign(s * I(10)^e, x))
end
for RM in (RoundingMode{:ToZero}, RoundingMode{:Down}, RoundingMode{:Up})
@eval Base.round(::Type{Signed}, x::DecimalFloatingPoint, r::$RM) = round(Int, x, r)
@eval Base.round(::Type{Unsigned}, x::DecimalFloatingPoint, r::$RM) = round(UInt, x, r)
@eval Base.round(::Type{Integer}, x::DecimalFloatingPoint, r::$RM) = round(Int, x, r)
end
function Base.round(::Type{I}, x::DecimalFloatingPoint, r::RoundingMode) where {I<:Integer}
x′ = round(x, r)
typemin(I) <= x′ <= typemax(I) || throw(InexactError(:round, I, x))
_, s, e = sigexp(x′)
return I(flipsign(s * I(10)^e, x))
end

Base.Signed(x::DecimalFloatingPoint) = Int(x)
Expand All @@ -599,10 +595,7 @@ function Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:NearestT
y = floor(T, x)
ifelse(x==y, y, copysign(floor(T, 2*x-y), x))
end
Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:ToZero}) where {T<:Integer} = trunc(T, x)
Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:FromZero}) where {T<:Integer} = (x>=0 ? ceil(T, x) : floor(T, x))
Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:Up}) where {T<:Integer} = ceil(T, x)
Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:Down}) where {T<:Integer} = floor(T, x)

# the complex-sqrt function in base doesn't work for use, because it requires base-2 ldexp
function Base.sqrt(z::Complex{T}) where {T<:DecimalFloatingPoint}
Expand Down
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