[PATCH] Update optimization passes to handle inalloca arguments

[Philip Reames]

Reid,

Out of curiosity, what's the motivation behind inalloca?  I found your 
update to the documentation which described their semantics, but I 
didn't find any discussion of when "inalloc" parameters would actually 
be useful.  Could you point me to the appropriate discussion thread?  
Just trying to understand the motivation for the changes.

Philip

On 12/19/13 2:43 PM, Reid Kleckner wrote:
> I searched Transforms/ and Analysis/ for 'ByVal' and updated those call
> sites to check for inalloca if appropriate.
>
> I added tests for any change that would allow an optimization to fire on
> inalloca.
>
> http://llvm-reviews.chandlerc.com/D2449
>
> Files:
>    include/llvm/IR/Argument.h
>    include/llvm/IR/Instructions.h
>    include/llvm/Support/CallSite.h
>    lib/Analysis/MemoryBuiltins.cpp
>    lib/Analysis/ValueTracking.cpp
>    lib/IR/Function.cpp
>    lib/IR/Instructions.cpp
>    lib/Transforms/IPO/ArgumentPromotion.cpp
>    lib/Transforms/IPO/DeadArgumentElimination.cpp
>    lib/Transforms/IPO/FunctionAttrs.cpp
>    lib/Transforms/IPO/IPConstantPropagation.cpp
>    lib/Transforms/InstCombine/InstCombineCalls.cpp
>    lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
>    lib/Transforms/ObjCARC/ObjCARC.h
>    lib/Transforms/Scalar/DeadStoreElimination.cpp
>    test/Transforms/ArgumentPromotion/inalloca-2.ll
>    test/Transforms/ArgumentPromotion/inalloca.ll
>    test/Transforms/DeadStoreElimination/simple.ll
>    test/Transforms/FunctionAttrs/readattrs.ll
>
>
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