Ping.
On 2011/5/9 11:02 PM, Chung-Lin Tang wrote:
> Ping.
>
> On 04/22/2011 11:21 PM, Chung-Lin Tang wrote:
>> Hi Richard, this part's for you.
>>
>> The ARM backend changes needed are very little after the prior patches,
>> basically just a case in arm_canonicalize_comparison() to detect
>> (zero_extend:SI (subreg:QI (reg:SI ...) 0)), and swap it into (and:SI
>> (reg:SI) #255).
>>
>> Had we not tried the combine modifications, this testcase probably could
>> have also be solved by implementing another version of the corresponding
>> *andsi3_compare0/_scratch patterns, with ZERO_EXTEND in the body, and
>> "ands" in the output assembly. Maybe that's an acceptable solution too...
>>
>> About the (ab)use of CANONICALIZE_COMPARISON, if it really should be
>> another macro/hook, then this ARM patch will need updating, but the code
>> should be similar.
>>
>> Thanks,
>> Chung-Lin
>
