Re: Question about Machine Description

[Revital1 Eres]

Hello,

> I want to limit the size of immediate field of some operation.

I think you can look at SIGNED_INT_FITS_N_BITS definition at
config/crx/crx.c
for such example.
You can write a predicate like the following; and use it when describing
the immediate
operand in the md file.

(define_predicate "s24bits_operand"
  (match_code "const_int")
  {
    return (SIGNED_INT_FITS_N_BITS(INTVAL(op), 24)) ? 1 : 0;
  }
)

Thanks,
Revital