This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Cleanup some rtl cruft


On Thursday 11 November 2004 00:29, David Edelsohn wrote:
> > ... it removes the second operand, CONTAINING_INSN, from the LABEL_REF
> > rtx.
>
> 	Please make sure that this does not break the LABEL_REF part of
> the hash function in config/rs6000.c:rs6000_hash_constant().

That function says,

static unsigned
rs6000_hash_constant (rtx k)
{
  /* ... */
  switch (code)
    {
    case LABEL_REF:
      return result * 1231 + (unsigned) INSN_UID (XEXP (k, 0));

So, it only hashes the INSN_UID of the INSN with the CODE_LABEL that
the LABEL_REF refers to.  Perfectly safe.

Gr.
Steven




Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]