Fix rounding on 0.7 (#70)

Author: jmkuhn

src/DecFP.jl

@@ -340,7 +340,9 @@ for w in (32,64,128)
         @eval Base.$f(x::$BID) = @xchk(ccall(($(bidsym(w,c)), libbid), $BID, ($BID,), x), DomainError, x, mask=INVALID)
     end
 
-    @eval Base.round(x::$BID, ::RoundingMode{:Nearest}) = @xchk(ccall(($(bidsym(w,"round_integral_nearest_even")), libbid), $BID, ($BID,), x), DomainError, x, mask=INVALID)
+    for (r,c) in ((RoundingMode{:Nearest},"round_integral_nearest_even"), (RoundingMode{:NearestTiesAway},"round_integral_nearest_away"), (RoundingMode{:ToZero},"round_integral_zero"), (RoundingMode{:Up},"round_integral_positive"), (RoundingMode{:Down},"round_integral_negative"))
+        @eval Base.round(x::$BID, ::$r) = @xchk(ccall(($(bidsym(w,c)), libbid), $BID, ($BID,), x), DomainError, x, mask=INVALID)
+    end
 
     for (f,c) in ((:(==),"quiet_equal"), (:>,"quiet_greater"), (:<,"quiet_less"), (:(>=), "quiet_greater_equal"), (:(<=), "quiet_less_equal"))
         @eval Base.$f(x::$BID, y::$BID) = nox(ccall(($(bidsym(w,c)), libbid), Cint, ($BID,$BID), x, y) != 0)
@@ -395,7 +397,6 @@ for w in (32,64,128)
                 Base.trunc(::Type{$Ti′}, x::$BID) = @xchk(ccall(($(bidsym(w,"to_",i′str,"_xint")), libbid), $Ti′, ($BID,), x), InexactError, :trunc, $BID, x, mask=INVALID | OVERFLOW)
                 Base.floor(::Type{$Ti′}, x::$BID) = @xchk(ccall(($(bidsym(w,"to_",i′str,"_xfloor")), libbid), $Ti′, ($BID,), x), InexactError, :floor, $BID, x, mask=INVALID | OVERFLOW)
                 Base.ceil(::Type{$Ti′}, x::$BID) = @xchk(ccall(($(bidsym(w,"to_",i′str,"_xceil")), libbid), $Ti′, ($BID,), x), InexactError, :ceil, $BID, x, mask=INVALID | OVERFLOW)
-                Base.round(::Type{$Ti′}, x::$BID) = @xchk(ccall(($(bidsym(w,"to_",i′str,"_xrnint")), libbid), $Ti′, ($BID,), x), InexactError, :round, $BID, x, mask=INVALID | OVERFLOW)
                 Base.round(::Type{$Ti′}, x::$BID, ::RoundingMode{:NearestTiesAway}) = @xchk(ccall(($(bidsym(w,"to_",i′str,"_xrninta")), libbid), $Ti′, ($BID,), x), InexactError, :round, $BID, x, mask=INVALID | OVERFLOW)
                 Base.convert(::Type{$Ti′}, x::$BID) = @xchk(ccall(($(bidsym(w,"to_",i′str,"_xfloor")), libbid), $Ti′, ($BID,), x), InexactError, :convert, $BID, x)
                 Base.$(Symbol("$Ti′"))(x::$BID) = convert($Ti′, x)
@@ -418,7 +419,8 @@ Base.round(::Type{Integer}, x::DecimalFloatingPoint) = round(Int, x)
 Base.round(::Type{Integer}, x::DecimalFloatingPoint, ::RoundingMode{:NearestTiesAway}) = round(Int, x, RoundNearestTiesAway)
 Base.convert(::Type{Integer}, x::DecimalFloatingPoint) = convert(Int, x)
 
-Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:Nearest}) where {T<:Integer} = round(T, x)
+Base.round(::Type{T}, x::DecimalFloatingPoint) where {T<:Integer} = convert(T, round(x))
+Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:Nearest}) where {T<:Integer} = convert(T, round(x, RoundNearest))
 function Base.round(::Type{T}, x::DecimalFloatingPoint, ::RoundingMode{:NearestTiesUp}) where {T<:Integer}
     y = floor(T, x)
     ifelse(x==y, y, copysign(floor(T, 2*x-y), x))