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Re^4: XS: returning a 64-bit unsigned int?

by ikegami (Pope)
on Sep 27, 2011 at 07:21 UTC ( #928031=note: print w/ replies, xml ) Need Help??


in reply to Re^3: XS: returning a 64-bit unsigned int?
in thread XS: returning a 64-bit unsigned int?

Perl claims the right to convert among equivalent representations. It's an optimisation that an UV isn't used unless needed since UVs require extra handling.

>perl -MDevel::Peek -e"Dump(0x7FFFFFFF)" SV = IV(0x1de9d00) at 0x1de9d04 REFCNT = 1 FLAGS = (PADTMP,IOK,READONLY,pIOK) IV = 2147483647 >perl -MDevel::Peek -e"Dump(0x80000000)" SV = IV(0x4a9d00) at 0x4a9d04 REFCNT = 1 FLAGS = (PADTMP,IOK,READONLY,pIOK,IsUV) UV = 2147483648


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