I remember from when I used to disassemble compiled ARM code (not on the NDS though) that it was common to see CMP, followed by a bunch of instructions with one condition predicate, followed by a bunch of instructions with the opposite predicate.
In this case, it's subtly wrong to use that pattern, but only on older versions of ARM. That could reflect a very sneaky attempt to break emulators… but it could also just be a compiler bug.
That said, I too don't understand how corruption could be produced unless there was a copy/paste mistake.
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Are you sure it's handwritten or obfuscated?
I remember from when I used to disassemble compiled ARM code (not on the NDS though) that it was common to see CMP, followed by a bunch of instructions with one condition predicate, followed by a bunch of instructions with the opposite predicate.
In this case, it's subtly wrong to use that pattern, but only on older versions of ARM. That could reflect a very sneaky attempt to break emulators… but it could also just be a compiler bug.
That said, I too don't understand how corruption could be produced unless there was a copy/paste mistake.