x86 leal quirk

[Ulrich Drepper]

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Richard Henderson wrote:
> 	leal    %gs:j@NTPOFF, %eax
> 
> I guess I can see how it kinda makes sense, encoding-wise,
> but it'd be nice if it at least gave a warning, since it
> doesn't really do what you expect it to do.

I understand completely where you come from, having been bitten by the
same bug.

But where would you stop?

      .byte 0x65
      leal    j@NTPOFF, %eax


What is the assembler supposed to do with that?  Or even something as
sick as

      jne     1f
      .byte 0x65
1:    leal    j@NTPOFF, %eax


And while we're at it

      leal    %ds:j@NTPOFF, %eax

(or %cs or %es).  There is no guarantee that those segments have a zero
offset.

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