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 I would prefer other companies, too, take a more aggressive approach towards deprecating outdated technology in consumer technology.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: Not a good thing
by ahferroin7 on Mon 5th Feb 2018 12:39 UTC in reply to "Not a good thing"
ahferroin7
Member since:
2015-10-30

Outside of x86, yes, there's really not much benefit unless you are handling very large amounts of data or need to deal with large numbers (though TBH, there are a lot more things that need to handle 64-bit integers than you probably realize, especially since files larger than 4GB are not all that uncommon).

On x86 though, the 8 extra general-purpose registers can actually have a pretty serious impact on performance of an application because the base register set is absolute shit (4 registers that all have odd restrictions on how they can be used as a result of the original hardware implementation).

Reply Parent Score: 2

RE[2]: Not a good thing
by Kochise on Mon 5th Feb 2018 20:04 in reply to "RE: Not a good thing"
Kochise Member since:
2006-03-03

Then tell me why 80% of x64 laptops sold are with just 4GB of RAM ? What's the point ?

Reply Parent Score: 1

RE[3]: Not a good thing
by darknexus on Mon 5th Feb 2018 20:14 in reply to "RE[2]: Not a good thing"
darknexus Member since:
2008-07-15

Because OEMs and retail stores will foist the cheapest crap they can on to unaware customers, that's why. And then they can make a fortune on selling RAM upgrades to those same customers who don't know any better.

Reply Parent Score: 1

RE[3]: Not a good thing
by ahferroin7 on Mon 5th Feb 2018 20:21 in reply to "RE[2]: Not a good thing"
ahferroin7 Member since:
2015-10-30

Again, as I said in the second half of my comment, you get 8 more general purpose registers when running in Long mode (64-bit mode) on an x86 CPU, which can be pretty damn significant in terms of performance. For reference, 16 and 32 bit x86 have 4 GP registers (which aren't even entirely general purpose in the original ISA, as they have odd hardware level restrictions on which instructions use them for what), while the Motorola 68000 has 8, ARM has 15 (pre ARMv8) or 31 (ARMv8 and newer), MIPS has 32, SPARC has 31, PPC has 32, and IA-64 (Intel's now defunct Itanium ISA) has a whopping 128. More general purpose registers means you need to make fewer memory accesses when working with small amounts of data (or don't have to regularly load and store frequently used values), which is a huge performance boost in many cases.

You also get a measurable boost in performance for math operations involving potentially large numbers (which is also pretty big, as a lot of I/O calls use 64-bit numbers so they can deal with files bigger than 4GB), and moving data to and from memory becomes a bit more efficient in some cases (this really depends more on the memory controller and how the memory modules are connected, but in general a single 64-bit load from RAM is going to be more efficient than two 32-bit loads, even if it's just because the CPU only has to execute one instruction instead of two).

There's also the fact that many of said 64-bit laptops support more RAM, they just don't ship in such a configuration, and while 32-bit x86 can handle a larger hardware address space through PAE, handling of that is a pain in the arse for OS developers and actually can hurt performance pretty significantly relative to not using it, and more importantly that purely 32-bit x86 consumer CPU's aren't really produced anymore beyond some Intel options that are more solidly targeted at ultra-compact embedded designs but for some reason still get used by laptop manufacturers.

Reply Parent Score: 2