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Fix edge cases where inexact conversions to UInt don't throw #51095

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merged 5 commits into from
Aug 30, 2023
Merged

Fix edge cases where inexact conversions to UInt don't throw #51095

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e218618
Update the upper bound for conversions to be a little stricter & add …
Aug 28, 2023
3335c09
add inline comment
Aug 30, 2023
7a8bfbe
add exhaustive tests
Aug 30, 2023
bd0cadc
Merge branch 'master' into lh/convert-bugfix
LilithHafner Aug 30, 2023
0ec4ad5
fix typo in comment
Aug 30, 2023
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2 changes: 1 addition & 1 deletion base/float.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -939,7 +939,7 @@ for Ti in (Int8, Int16, Int32, Int64, Int128, UInt8, UInt16, UInt32, UInt64, UIn
end
end
function (::Type{$Ti})(x::$Tf)
if ($(Tf(typemin(Ti))) <= x <= $(Tf(typemax(Ti)))) && isinteger(x)
if ($(Tf(typemin(Ti))) <= x < $(Tf(typemax(Ti))+one(Tf))) && isinteger(x)
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I think this deserves a source comment about why this isn't equivalent to <=.

return unsafe_trunc($Ti,x)
else
throw(InexactError($(Expr(:quote,Ti.name.name)), $Ti, x))
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9 changes: 9 additions & 0 deletions test/floatfuncs.jl
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Expand Up @@ -253,3 +253,12 @@ end
@test isapprox(typemin(T), 0.0, rtol=1)
end
end

@testset "Conversion to UInt near extremes (#51063)" begin
@test UInt64(4.2949673f9) === typemax(UInt32) + UInt64(1)
@test_throws InexactError UInt32(4.2949673f9)
@test UInt32(prevfloat(4.2949673f9)) === 0xffffff00
@test UInt128(1.8446744073709552e19) === typemax(UInt64) + UInt128(1)
@test_throws InexactError UInt64(1.8446744073709552e19)
@test UInt64(prevfloat(1.8446744073709552e19)) === 0xfffffffffffff800
end