[webkit-dev] Difference between jit/JITArithmetic32_64 and jit/JITArithmetic

[wingoog moon]

HI All.
Can't understand difference between jit/JITArithmetic32_64 and
jit/JITArithmetic.
Both of them are implementing JIT class. So when program calls functions
from JITArithmetic and when JITArithmetic32_64.

I also noticed that that there is JITOpcodes class, which is also
implementing JIT class. Why we need this class.

P.s
Sorry for bad English
thanks for answers.
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