[email protected] writes:
> Will there be any objections to using a quasi-documented mutation of the
> x86's AAD instruction in the 387 emulator? Every CPU around has to do this
> mutation correctly or a LOT of existing code will break...
>
> The performance of storing to user space of BCD numbers in the 387 emulator
> code could be improved significantly by using the mutant AAD instruction
> trick (i.e. alter its implicit base from 10 to 16). See reg_ld_str.c, in
> function FPU_store_bcd()
What do you mean by "quasi-documented" and "mutant"?
Intel certainly documents the "D5 ib" form as being a
valid way to change the base from the default 10.
The only issue AFAIK is that assemblers may only
recognise the plain base-10 AAD syntax. No biggie.
/Mikael
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