CHKA (Check Array) compares the unsigned values
in two registers.
If the value in the first register is lower than, or the same as, the second, it copies the PC to the LR, and causes a branch to the IndexCheck handler.
SyntaxCHKARn,Rm
where:
Rncontains the array size.
Rmust not be PC.nRmcontains the array index.
Rmust not be PC or SP.n
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