[Patch,AVR]: FIX ICE in optabs due to bad rotate expander.

[Denis Chertykov]

2011/4/17 Denis Chertykov <chertykov@gmail.com>:
> 2011/4/15 Georg-Johann Lay <avr@gjlay.de>:
>> Finally, I exposed alternative #3 of the insns to the register
>> allocator, because it is not possible to distinguish between
>> overlapping or non-overlapping regs, and #3 does not need a scratch.
>>
>> Ran C-testsuite with no regressions.
>
> Are you encountered any difference in code size ?

I'm ask about code size because the IRA pass isn't work with
`scratch:MODE' at all.
This lead to bad/wrong register allocation in IRA pass.
The reload pass will correct such a wrong allocation, but reload can't
generate optimal code. (reload generate correct code).
Because of that, may be you right and may be better to have
(clobber (match_operand....)) instead of (clobber (match_scratch...)).

Denis.