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registers(0-15) ,where they are going be resides., does
that mean here is it resides whether real or virtual
memory? and why?
then why we are assign even registers(0 to 6) for FP
operations????
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Answer Posted / steve holton
Clarifications:
As noted, registers are part of the CPU, and --not-- part of
"memory".
There are 16 general purpose registers, which are numbered
0--15 (not 16 - that would be 17 registers!).
There are also other registers - control registers, PSW,
etc., that are used by the operating system, and "normal
mortals" are supposed to ignore...
Floating point registers are separate from the general
purpose registers. Not all floating point instructions
require even registers - if you use 128-bit ("extended
precision") floating point, you can use FPR registers
1,3,5,and 7-15 on ESA390 models that have the AFP registers
"installed".
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