peephole2: dead regs not marked as dead

[Paolo Bonzini]

On 10/28/2010 03:10 PM, Georg Lay wrote:
> Georg Lay schrieb:
>
>> This code is not nice.
>>
>> ;; d8 = d4 * d6
>> ;; d8 = d2
>> ;; d2 = d8
>> ;; return d2
>
> this should be
>
> ;; d2 = d4 * d6
> ;; d8 = d2
> ;; d2 = d8
> ;; return d2

It seems to me that some of your peepholes should instead be implemented 
using constraints and multiple alternatives (for example the xor one), 
so that reload and register allocation can do a better job.  However I 
can't tell without looking at the code.

Paolo