DAGCombiner: Merge store/loads when we have extload/truncstores

[Arnold Schwaighofer]

r178546

Thanks
f
On Apr 2, 2013, at 10:42 AM, Nadav Rotem <nrotem at apple.com> wrote:

> LGTM. 
> 
> On Apr 2, 2013, at 8:28 AM, Arnold Schwaighofer <aschwaighofer at apple.com> wrote:
> 
>> DAGCombiner: Merge store/loads when we have extload/truncstores
>> 
>> This is helps on architectures where i8,i16 are not legal but we have byte,
>> and short loads/stores like on ARM.
>> 
>> Allowing us to merge copies like the one below on ARM.
>> 
>> copy(char *a, char *b, int n) {
>>  do {
>>    int t0 = a[0];
>>    int t1 = a[1];
>>    b[0] = t0;
>>    b[1] = t1;
>> 
>> radar://13536387
>> 
>> <0001-DAGCombiner-Merge-store-loads-when-we-have-extload-t.patch>