Sent from my iPhone > On Jun 19, 2017, at 13:44, John McCall via swift-evolution > <swift-evolution@swift.org> wrote: > >>> On Jun 19, 2017, at 1:58 PM, Stephen Canon via swift-evolution >>> <swift-evolution@swift.org> wrote: >>> On Jun 19, 2017, at 11:46 AM, Ted F.A. van Gaalen via swift-evolution >>> <swift-evolution@swift.org> wrote: >>> >>> var result: Float = 0.0 >>> result = float * integer * uint8 + double >>> // here, all operands should be implicitly promoted to Double before the >>> complete expression evaluation. >> >> You would have this produce different results than: >> >> let temp = float * integer * uint8 >> result = temp + double >> >> That would be extremely surprising to many unsuspecting users. >> >> Don’t get me wrong; I *really want* implicit promotions (I proposed one >> scheme for them way back when Swift was first unveiled publicly). > > I don't! At least not for floating point. It is important for both reliable > behavior and performance that programmers understand and minimize the > conversions they do between different floating-point types. How expensive is it? - Dave Sweeris
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