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Add exhaustive divrem tests for ZZ #1919

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Add exhaustive divrem tests for ZZ #1919

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aecfb59
Add exhaustive `divrem` tests for ZZ
lgoettgens Oct 23, 2024
26fd198
Remove troubling method
lgoettgens Oct 23, 2024
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4 changes: 0 additions & 4 deletions src/flint/fmpz.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -491,10 +491,6 @@ function rem(x::ZZRingElem, c::ZZRingElem)
return r
end

function rem(a::ZZRingElem, b::UInt)
return ccall((:fmpz_fdiv_ui, libflint), UInt, (Ref{ZZRingElem}, UInt), a, b)
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as this will remove ZZ(3) % UInt(2) I don't like it. Rather do an error if the input is illegal (ie. the remainder negative)

end

###############################################################################
#
# Ad hoc binary operators
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87 changes: 87 additions & 0 deletions test/flint/fmpz-test.jl
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Expand Up @@ -1657,3 +1657,90 @@ end
@test @inferred collect(bits(ZZ(5))) == Bool[true, false, true]
@test @inferred collect(bits(ZZ(2)^64)) == append!([true], falses(64))
end

@testset "ZZRingElem.divrem (both versions)" begin
for i in 1:5
x = rand(100:1000)
y = rand(5:100)

for (x, y) in ((x, y), (-x, y), (x, -y), (-x, -y))
Bdr = Base.divrem(x, y)
@test Bdr == (Base.div(x, y), Base.rem(x, y))
@test Bdr == Base.divrem(BigInt(x), y)
@test Bdr == (Base.div(BigInt(x), y), Base.rem(BigInt(x), y))
@test Bdr == Base.divrem(x, BigInt(y))
@test Bdr == (Base.div(x, BigInt(y)), Base.rem(x, BigInt(y)))
@test Bdr == Base.divrem(BigInt(x), BigInt(y))
@test Bdr == (Base.div(BigInt(x), BigInt(y)), Base.rem(BigInt(x), BigInt(y)))
@test Bdr == Base.divrem(ZZ(x), y)
@test Bdr == (Base.div(ZZ(x), y), Base.rem(ZZ(x), y))
@test Bdr == Base.divrem(x, ZZ(y))
@test Bdr == (Base.div(x, ZZ(y)), Base.rem(x, ZZ(y)))
@test Bdr == Base.divrem(ZZ(x), ZZ(y))
@test Bdr == (Base.div(ZZ(x), ZZ(y)), Base.rem(ZZ(x), ZZ(y)))
@test Bdr == Base.divrem(BigInt(x), ZZ(y))
@test Bdr == (Base.div(BigInt(x), ZZ(y)), Base.rem(BigInt(x), ZZ(y)))
@test Bdr == Base.divrem(ZZ(x), BigInt(y))
@test Bdr == (Base.div(ZZ(x), BigInt(y)), Base.rem(ZZ(x), BigInt(y)))
if x > 0
#@test Bdr == Base.divrem(UInt(x), y)
#@test Bdr == (Base.div(UInt(x), y), Base.rem(UInt(x), y))
@test Bdr == Base.divrem(UInt(x), BigInt(y))
@test Bdr == (Base.div(UInt(x), BigInt(y)), Base.rem(UInt(x), BigInt(y)))
@test Bdr == Base.divrem(UInt(x), ZZ(y))
@test Bdr == (Base.div(UInt(x), ZZ(y)), Base.rem(UInt(x), ZZ(y)))
end
if y > 0
@test Bdr == Base.divrem(x, UInt(y))
@test Bdr == (Base.div(x, UInt(y)), Base.rem(x, UInt(y)))
@test Bdr == Base.divrem(BigInt(x), UInt(y))
@test Bdr == (Base.div(BigInt(x), UInt(y)), Base.rem(BigInt(x), UInt(y)))
@test Bdr == Base.divrem(ZZ(x), UInt(y))
@test Bdr == (Base.div(ZZ(x), UInt(y)), Base.rem(ZZ(x), UInt(y)))
if x > 0
@test unsigned.(Bdr) == Base.divrem(UInt(x), UInt(y))
@test unsigned.(Bdr) == (Base.div(UInt(x), UInt(y)), Base.rem(UInt(x), UInt(y)))
end
end

Ndr = Nemo.divrem(x, y)
@test Ndr == (Nemo.div(x, y), mod(x, y))
@test Ndr == Nemo.divrem(BigInt(x), y)
@test Ndr == (Nemo.div(BigInt(x), y), mod(BigInt(x), y))
@test Ndr == Nemo.divrem(x, BigInt(y))
@test Ndr == (Nemo.div(x, BigInt(y)), mod(x, BigInt(y)))
@test Ndr == Nemo.divrem(BigInt(x), BigInt(y))
@test Ndr == (Nemo.div(BigInt(x), BigInt(y)), mod(BigInt(x), BigInt(y)))
@test Ndr == Nemo.divrem(ZZ(x), y)
@test Ndr == (Nemo.div(ZZ(x), y), mod(ZZ(x), y))
@test Ndr == Nemo.divrem(x, ZZ(y))
@test Ndr == (Nemo.div(x, ZZ(y)), mod(x, ZZ(y)))
@test Ndr == Nemo.divrem(ZZ(x), ZZ(y))
@test Ndr == (Nemo.div(ZZ(x), ZZ(y)), mod(ZZ(x), ZZ(y)))
@test Ndr == Nemo.divrem(BigInt(x), ZZ(y))
@test Ndr == (Nemo.div(BigInt(x), ZZ(y)), mod(BigInt(x), ZZ(y)))
@test Ndr == Nemo.divrem(ZZ(x), BigInt(y))
@test Ndr == (Nemo.div(ZZ(x), BigInt(y)), mod(ZZ(x), BigInt(y)))
if x > 0
#@test Ndr == Nemo.divrem(UInt(x), y)
#@test Ndr == (Nemo.div(UInt(x), y), mod(UInt(x), y))
@test Ndr == Nemo.divrem(UInt(x), BigInt(y))
@test Ndr == (Nemo.div(UInt(x), BigInt(y)), mod(UInt(x), BigInt(y)))
@test Ndr == Nemo.divrem(UInt(x), ZZ(y))
@test Ndr == (Nemo.div(UInt(x), ZZ(y)), mod(UInt(x), ZZ(y)))
end
if y > 0
#@test Ndr == Nemo.divrem(x, UInt(y))
#@test Ndr == (Nemo.div(x, UInt(y)), mod(x, UInt(y)))
@test Ndr == Nemo.divrem(BigInt(x), UInt(y))
@test Ndr == (Nemo.div(BigInt(x), UInt(y)), mod(BigInt(x), UInt(y)))
@test Ndr == Nemo.divrem(ZZ(x), UInt(y))
@test Ndr == (Nemo.div(ZZ(x), UInt(y)), mod(ZZ(x), UInt(y)))
if x > 0
@test unsigned.(Ndr) == Nemo.divrem(UInt(x), UInt(y))
@test unsigned.(Ndr) == (Nemo.div(UInt(x), UInt(y)), mod(UInt(x), UInt(y)))
end
end
end
end
end
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