Difference in Opcodes

[Shehryar Humayun]

Hi,

Why is it that the opcodes generated by CGEN in
arm-opc.c and the opcodes written in tc-arm.c for the
same insn different. e.g.
in tc-arm.c, the opcode for instruction 
          add $rd,$rs,$rn
is "0x0000" and in arm-opc.c (the one generated by
CGEN), the value is "0x1800".

Can any one tell me how are the opcode values
generated by CGEN? Moreover, how can the two values
produce the same results? Thirdly, how is the
semantics field in define-normal-insn interperated and
where is it output?

Regards

Shehryar

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