Routine to aid in setting things up for gen().
Look for common subexpression.
Can handle indirection operators, but not if they're common subs.
Input:
e -> elem where we get some of the data from
cs -> partially filled code to add
op = opcode
reg = reg field of (mod reg r/m)
offset = data to be added to Voffset field
keepmsk = mask of registers we must not destroy
desmsk = mask of registers destroyed by executing the instruction
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Routine to aid in setting things up for gen(). Look for common subexpression. Can handle indirection operators, but not if they're common subs. Input: e -> elem where we get some of the data from cs -> partially filled code to add op = opcode reg = reg field of (mod reg r/m) offset = data to be added to Voffset field keepmsk = mask of registers we must not destroy desmsk = mask of registers destroyed by executing the instruction