Delphi-PRAXiS - Turning lowers to uppers without a branch

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14. Jun 2024 07:10

Turning lowers to uppers without a branch

In another comment of the Curiouser Case, Arnaud Bouchez pointed to an interesting optimization that is use in mORMot‘s UpperCopy255Buf function: a branchless parallel upper case conversion. At the core of that implementation are the following lines of code c := src[i]; d := c or _80; dest[i] := c - ((d - _61) and…

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