[PATCH] D22035: [LoopVectorizer] Fixed a bug in gather/scatter intrinsics.

[Elena Demikhovsky via llvm-commits]

delena created this revision.
delena added a reviewer: Ayal.
delena added subscribers: llvm-commits, sanjoy.
delena set the repository for this revision to rL LLVM.
Herald added a subscriber: mzolotukhin.

The bug was in building vector GEP before gather scatter.
Index of GEP may remain scalar if it is nit defined inside the loop. (isLoopInvariant() condition is not enough).

The patch fixes https://llvm.org/bugs/show_bug.cgi?id=27997.

You see a lot of insert/extract instructions inside the test. I'll optimize this in the next patch.

Repository:
  rL LLVM

http://reviews.llvm.org/D22035

Files:
  ../lib/Transforms/Vectorize/LoopVectorize.cpp
  ../test/Transforms/LoopVectorize/X86/gather_scatter.ll
  ../test/Transforms/LoopVectorize/X86/scatter_crash.ll

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