On Fri, 17 May 2019 18:06:13 +0200 Ondrej Pokorny <laza...@kluug.net> wrote:
> On 17.05.2019 10:47, Marco Borsari via fpc-devel wrote: > > Does this is an effect of some multiplication overflow, or is it a bug? > > Both the bit operations and the arithmetic opretaions return integers as > results and not words: > https://www.freepascal.org/docs-html/ref/refsu46.html > https://www.freepascal.org/docs-html/ref/refsu45.html#x148-17000012.8.1 > > The c:=... overflows - you get a range check error: > > c:=(a XOR b)*(a SHL 5+b SHR 2); // range check error > > Just add a couple of word() casts where you need the integer-result to > be casted to word: I tested it (the hash is used for a contest selector in a data compressor), but it seems that the results are bit identical with or without the cast. Do you point it out to suppress false positives in a debug phase? Anyway, thank you. -- Simplex sigillum veri _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
