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Re^2: I need to know if 32-bit or 64-bit perl is running my script.

by mbethke (Hermit)
on Sep 14, 2013 at 06:58 UTC ( [id://1054062]=note: print w/replies, xml ) Need Help??


in reply to Re: I need to know if 32-bit or 64-bit perl is running my script.
in thread I need to know if 32-bit or 64-bit perl is running my script.

To see the userland code size that's a nice way. But if the kernel determines where stuff is placed in a struct and the kernel can run both 32- and 64-bit executables, you're still fuct. Plus some weird architectures like AS/400 (relevant for AIX) use 128bit pointers even on 32bit ALUs.
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Re^3: I need to know if 32-bit or 64-bit perl is running my script.
by BrowserUk (Patriarch) on Sep 14, 2013 at 07:50 UTC
    But if the kernel determines where stuff is placed in a struct and the kernel can run both 32- and 64-bit executables, you're still fuct.

    That is certainly not the case for Intel processors. Even running under 64-bit kernels; 32-bit processes only use 32-bit pointers.

    Plus some weird architectures like AS/400 (relevant for AIX) use 128bit pointers even on 32bit ALUs.

    I know naff all about AS/400, but since the original AS/400 hardware was 48-bit; and it has all been 64-bit for the last decade or so; one wonders whether the question is even relevant for such hardware?


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      True about the 32bit pointers, I just assumed Su^H^HOracle had changed something about the struct layout in 64bit versions. Otherwise the whole problem shouldn't exist as the change would be transparent to whatever C code retrieves the struct and passes it to Perl. In any case that's the leven the problem should be solved on. Actually I've never written anything for AS/400 either and especially with IBM's compatibility-back-to-the-60s fetishism you're right that it shouldn't matter at all. Wonder why the OP seemed to have a similar problem there.

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