[PATCH] Add support for complex aggregate store in InstCombine

[Amaury SECHET]

Rebase.

As per discussion with @majnemer , the open question is what to do if the aggregate is larger than what is supported on the target.

IMO, it is still preferable to generate load too larges, as they are at least somewhat supported as opposed to not supported at all.


http://reviews.llvm.org/D9766

Files:
  lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  test/Transforms/InstCombine/unpack-fca.ll

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