Hello,
I'm using an ARMv8 processor in 32 bit ARMv7 compatibility mode.
I would like to know if there is any difference (performance gain) in ARMv8 running in AArch32 mode Vs running the same on an an ARMv7.
Thanks!
Oh for sure, it'd be better to develop ARMv8 specific code on ARMv8. Having the ability to use ~28 64 bits registers (32 - special ones), instead of ~10 (or 7 in Thumb2) 32 bits registers is clearly a game changer.
However, I'd still like to know if there's a real performance loss (like 10% or more) when running ARMv7 code on ARMv8. Just in case I'd have to develop some ARM assembly specific algorithm that work on phones AND common SoC (RPi and such).
I too would like to know. We have legacy ARMv7 code that runs correctly. The question then becomes is it worth the effort to convert all that code to ARMv8. Will there be a significant performance improvement to justify the conversion effort?