Operation with WREG and indexed register.

To implement indirect addressing, a file select register (FSR) and indirect register (INDF) are used.

The result can be written to either the Working register (e.g.

A register number is written to the FSR, after which reads from or writes to INDF will actually be to or from the register pointed to by FSR.

Until SSE2, SSE integer instructions introduced with later SSE extensions could still operate on 64 bit MMX registers because the new XMM registers require operating system support.

In both cases, the upper address bits are provided by the PCLATH register.

Some operations, such as bit setting and testing, can be performed on any numbered register, but bi operand arithmetic operations always involve W (the accumulator), writing the result back to either W or the other operand register.

Pointers are implemented using a register pair after writing an address to the FSR (file select register), the INDF (indirect f) register becomes an alias for the addressed register.

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See also CPU cache Register allocation Register file Shift register References

To load a constant, it is necessary to load it into W before it can be moved into another register.

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While the male unemployment rate increased during 2001 , the female Chart 19

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The level of the autonomous factors averaged Euros 103.1 billion in 2000 , ranging from Euros 78.2 billion to Euros 158.6 billion ( see Chart 18 ) .

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