[PATCH] D21496: LoadCombine BugFixes : Combine negative index GEPS and fix load aliasing

[River Riddle via llvm-commits]

rriddle created this revision.
rriddle added a reviewer: Bigcheese.
rriddle added a subscriber: llvm-commits.


Removed the alias set tracker and added individual load aliasing checks for each individual chain.
Changed the offset from uint64 to int64 to be able to combine loads formed from a negative index GEP
Added support to continue combining when a load chain is not a power of 2.

// A test case for the aliasing and negative indexing
{F2081753}

// The old result 
{F2081755}

// The new result
{F2081756}

http://reviews.llvm.org/D21496

Files:
  /Users/rriddle/Desktop/llvm/llvm/lib/Transforms/Scalar/LoadCombine.cpp

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