[PATCH] D18546: Prevent X86IselLowering from merging volatile loads

[Nirav Dave via llvm-commits]

niravd created this revision.
niravd added a reviewer: RKSimon.
niravd added a subscriber: llvm-commits.

In EltsFromConsecutiveLoads we check to see if a vector of values coming
from a set of loads can be merged into a single large load, but did not
check that the loads are non-volatile.

This issue is exposed by the Merge Consecutive Store cleanups in D14834

http://reviews.llvm.org/D18546

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/merge-consecutive-loads-128.ll
  test/CodeGen/X86/merge-consecutive-loads-256.ll

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