Re: [PATCH GCC][1/6]Move compare_tree to tree.c and expose the interface.

["Bin.Cheng" <amker.cheng@gmail.com>]

On Fri, May 26, 2017 at 12:14 PM, Richard Biener
<richard.guenther@gmail.com> wrote:
> On Tue, May 23, 2017 at 6:22 PM, Bin Cheng <Bin.Cheng@arm.com> wrote:
>> Hi,
>> This patch set factors out runtime alias check code from tree-vect-data-refs.c
>> and tree-vect-loop-manip.c as general interfaces in tree-data-ref.c.  With this
>> change other optimizers like tree loop distribution could version loop wrto the
>> runtime alias checks.  During this work, I also found current code has issues
>> with negative DR_STEP.  This patch set fixes the issue as tracked in PR80815.
>>
>> This is the first patch simply moves compare_tree to tree.c and exposes it.
>> Bootstrap and test on x86_64 and AArch64, is it OK?
>
> I think the name is quite bad for an exported function given for INTEGER_CSTs
> it doesn't return anything resembling a comparison result.  Also (not
> your fault)
> it doesn't seem to handle hash collisions nor have a suitable fallback for
> trees it doesn't handle.
>
> I don't have a good suggestion for the name but tree.c exported fns should
> have higher standards regarding their implementation...
Hmm, I don't have idea to generalize it for the moment, so OK to
rename it to data_ref_compare_tree and move it to tree-data-ref.c?  It
needs to be external symbol though.

Thanks,
bin
>
> Richard.
>
>
>
>> Thanks,
>> bin
>>
>> 2017-05-22  Bin Cheng  <bin.cheng@arm.com>
>>
>>         * tree-vect-data-refs.c (compare_tree): Move ...
>>         * tree.c (compare_tree): ... to here.
>>         * tree.h (compare_tree): New decalaration.