Originally Posted by Tallest Skil
So why does the iPhone 5S show up to a 25% speed improvement on itself between otherwise identical 32-bit and 64-bit compiled apps?
Key word is up to, what is the Mode? Or most common speed improvement? Large data array software such as encryption, encoding, decoding, video editing software will give you those types of speed improvements if not higher speed improvements. Also is it comparing or are you comparing it to the 32 bit version of A7 processor? Lets take for example the most commonly used software, the Internet browser.
Internet Explorer 10 and 11 64 bit is only around 1-2% faster on benchmarks such as sunspider, kraken, v8 benchmarks compared to its 32 bit version. That is hardly a meaningful improvement.
So which software or apps is giving you those 25% speed improvements?
Keep this in mind: higher core clock speeds, faster LPDDR3 memory and quad-core PowerVR graphics chip — all independent improvements that the A7 makes, how much of those 25% speed improvements are attributed to that and not the 64 bit.
What is the most commonly used software that an iphone or ipad user uses? I have a feeling that it is not large data array software.
If you look at ST88 post you will see that according to Futuremark Benchmark the 64 bit version on average is only 7% faster, not enough to move it around on the rankings for fastest mobile phone.
Here is what Futuremark said:
64-bit is not the answer
We started our investigation by compiling a 64-bit version of 3DMark, since the version available in the App Store is 32-bit in order to be compatible with older Apple devices.
Once we had a 64-bit build we tested an iPhone 5s under controlled conditions in our Test Lab. As expected, we found that the results from the 64-bit version were similar to the 32-bit version, with only a 7 percent improvement.
So as I have said before large data array software such as encoding, encryption will give you those types of large speed improvements but if you are talking about the day to day software that the average owner of an iphone or ipad user uses than chances are no it doe not make any real meaningful performance increase.
Originally Posted by PhilBoogie
Perhaps his IQ only goes up to 32? More likely to have a single-digit IQ though.
Brilliant response! Did you know that Tallest Skil literally thought address bus did more than address memory.
Originally Posted by SolipsismX
Even though it's been mentioned he has completely ignored the new AArch64 ISA.
No I haven't.
Edited by Noliving - 12/28/13 at 8:41am