Arm6 vs Arm7 « cocos2d for iPhone

Arm6 vs Arm7

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SmallMike
Member

Does anyone have any good links about building for arm6 vs arm7. I came across some discussions about it on the Apple dev forums, but they just left me more confused. I can't seem to find any official Apple documentation on the matter.

https://devforums.apple.com/message/87016#87016
https://devforums.apple.com/message/110979#110979

Can you put an app on the store that is optimized for arm7 but still work on the 2.2 SDK? Is it even worth it? One of the discussions states "My app does a lot of DSP processing and being able to compile for the arm7 processor makes it a lot faster, the improvement is dramatic.", which leads me to believe there are certain areas where compiling for arm7 is beneficial. Is there documentation somewhere that lays this out?

- Mike

Posted 2 years ago #
yarri
Member

Hmmmm... fat binaries. It's a philosophical issue, which I think is why you don't see Apple taking a stance. The ARM Cortex (v7) is backward compatible with the ARM 11 (v6) which is what Apple counted on, the bulk of applications don't need to be tuned towards v7. However, there's a lot of horsepower on the Cortex you might want to tap into:
http://www.arm.com/products/CPUs/ARM_Cortex-A8.html

I personally think we'll start to see 3GS-only games, maybe at different prices?

--yarri

PS: The physics engines benefit the most from v7/NEON it seems...

Posted 2 years ago #

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