A question abt finding all register uses in instruction

A question abt finding all register uses in instruction

[Revital Eres]

Hello,

I am trying to extract the regsiter uses in instructions using note_uses
function. When encountering the following instruction I do not get r479
as a use; seemingly because of the following in note_use function:

       if (GET_CODE (dest) == ZERO_EXTRACT)
          {
            (*fun) (&XEXP (dest, 1), data);
            (*fun) (&XEXP (dest, 2), data);
          }

the instruction:

(insn 386 385 387 16 (set (zero_extract:SI (reg:SI 479)
            (const_int 16 [0x10])
            (const_int 16 [0x10]))
        (const_int 4112 [0x1010])) 343 {*arm_movtas_ze}
     (nil))

I appreciate any advise of how to resolve this -- should I add

  (*fun) (&XEXP (dest, 0), data); ?

Thanks,
Revital

Re: A question abt finding all register uses in instruction

[Ramana Radhakrishnan]

> I appreciate any advise of how to resolve this -- should I add
>
>  (*fun) (&XEXP (dest, 0), data); ?

Actually I don't see why not - a zero_extract on the LHS of an
expression is supposed to be a bit field insert on that register.
Isn't there an implicit read of the destination register involved in
this case in that the lower order bits of the register are left
unchanged ?

cheers
Ramana