* Q(backend): Indirect register access
@ 2002-10-11 5:42 Raimonds Cicans
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From: Raimonds Cicans @ 2002-10-11 5:42 UTC (permalink / raw)
To: gcc
Hi!
Question:
How to define in .md file instructions which need
one of its register operands to be specified
not in instruction itself but in special field
(let call it REGNUMFIELD) in control register?
Simplest solution:
In assembler otput just prepend such instructions
with instruction wich set REGNUMFIELD with
needed register number.
Problems:
1. In many cases additional instructions are redundant.
2. Many instructions as side effect can set REGNUMFIELD
Any ideas for other solutions?
Maybe something like:
REGNUMFIELD = force_reg (......., Register Number)?
But how to get 'Register Number' (as I understand
real 'Register Number' are available only on late
compilation stages)?
Will this solution solve problems 1. and 2. described above?
Raimonds Cicans
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2002-10-11 5:42 Q(backend): Indirect register access Raimonds Cicans
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