[PATCH] Allow CodeGen to take advantage of functions that always return arguments

[Stephen Lin]

Thanks! That seems to have gotten lost from the branch somehow. I'll
rematerialize from a prior patch and add more cases before committing.

On Fri, Apr 19, 2013 at 8:33 PM, Manman Ren <mren at apple.com> wrote:
>
> Hi Stephen,
>
> Did you forget to include testing cases in this patch?
> I remember you had testing cases in one of your earlier patches.
>
> Thanks
> Manman
>
> On Apr 19, 2013, at 7:48 AM, Stephen Lin wrote:
>
>>> OK, I removed some extraneous changes and updated the patch to be
>>> based against a mostly non-recursive implementation of sameNoopInput:
>>>
>>>    http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130415/172039.html
>>>
>>> I've also added the restriction that 'returned' can only be on one
>>> parameter to allow sameNoopInput to see through 'returned' without
>>> recursion or extra bookkeeping. There's a minor tack-on bug fix;
>>> apparently the verifier check that 'nest' is only on one parameter was
>>> never working correctly...I'm willing to split that off to a separate
>>> patch if that's preferable though.
>>>
>>> The other patch listed is my original e-mail has been committed so is
>>> no longer an uncommitted dependency.
>>>
>>> Stephen
>>
>> I fixed a small issue (an extraneous recursive call) and rebased against:
>>
>>     http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130415/172067.html
>>
>> (although the patch should merge cleanly against the previous version, too.)
>>
>> Stephen
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>