Linked by Thom Holwerda on Sat 3rd Feb 2018 14:15 UTC, submitted by Drumhellar
Mac OS X

When users attempt to launch a 32-bit app in 10.13.4, it will still launch, but it will do so with a warning message notifying the user that the app will eventually not be compatible with the operating system unless it is updated. This follows the same approach that Apple took with iOS, which completed its sunset of 32-bit app support with iOS 11 last fall.

This is good. I would prefer other companies, too, take a more aggressive approach towards deprecating outdated technology in consumer technology.

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RE[4]: Comment by ssokolow
by Alfman on Mon 5th Feb 2018 05:04 UTC in reply to "RE[3]: Comment by ssokolow"
Alfman
Member since:
2011-01-28

fmaxwell,

I understand, it is good that your car manufacturer is giving you a chance to repurchase or just throw away music you've paid for on cassettes and 8-track tapes.




Apple may not wish to support 32bit software, that's their prerogative. But your analogy is a bit off. 8 track->cassette->CD is replacing one technology with a new & incompatible technology. This doesn't match the situation for x86 hardware, since 32bit->64bit is largely the same technology with new extensions (like larger registers). Some features like segments were removed, but these weren't generally used in 32bit code (they were used by 16bit DOS eons ago). One way to make your analogy more accurate would be for your car manufacturer to stop supporting audio CDs but to continue supporting MP3 CDs. In other words, the hardware is still physically capable of supporting the legacy format, but your manufacturer chose not to.


From an x86 hardware perspective the 32bit and 64bit components can't be fully separated because 64bit registers and mov instructions are an extension of 32bit ones and not a replacement! So even 64bit x86 compilers can still generate 32bit instructions/addresses/registers depending on the software requirements.

Here is a very brief overview:
https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/x...

Edited 2018-02-05 05:13 UTC

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