On Mon, Jul 4, 2011 at 4:54 PM, Alan Modra <amo...@gmail.com> wrote:
> On Mon, Jul 04, 2011 at 01:57:34PM -0700, H.J. Lu wrote:
>> forward_propagate_subreg issue was introduced by
>>
>> http://gcc.gnu.org/ml/gcc-patches/2009-08/msg01203.html
>>
>> Before that,  fwprop never tries to work on hard registers.
>
> I question this claim.  It seems to me that fwprop did look at
> paradoxical subregs of hard regs before my change.

I should have said " fwprop never tries to work on zero/sign-extended
hard registers."

>>  Alan,
>> is your change to process hard registers intentional?
>
> I didn't set out to do anything special with hard regs one way or the
> other, just extended what was already done for paradoxical subregs to
> sign and zero extended subregs.
>

Does your change depend on processing zero/sign-extended
hard registers?

-- 
H.J.

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