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Author SHA1 Message Date
Nirav Dave a35938d827 Revert "[DAG] Rewrite areNonVolatileConsecutiveLoads to use BaseIndexOffset" 
This reverts commit r306819 which appears be exposing underlying
issues in a stage1 ppc64be build

llvm-svn: 306820
 2017-06-30 12:56:02 +00:00
Nirav Dave c5a48c1ee8 [DAG] Rewrite areNonVolatileConsecutiveLoads to use BaseIndexOffset 
As discussed in D34087, rewrite areNonVolatileConsecutiveLoads using
generic checks. Also, propagate missing local handling from there to
BaseIndexOffset checks.

Tests of note:

  * test/CodeGen/X86/build-vector* - Improved.
  * test/CodeGen/BPF/undef.ll - Improved store alignment allows an
    additional store merge

  * test/CodeGen/X86/clear_upper_vector_element_bits.ll - This is a
    case we already do not handle well. Here, the DAG is improved, but
    scheduling causes a code size degradation.

Reviewers: RKSimon, craig.topper, spatel, andreadb, filcab

Subscribers: nemanjai, llvm-commits

Differential Revision: https://reviews.llvm.org/D34472

llvm-svn: 306819
 2017-06-30 12:23:41 +00:00
Nirav Dave 168c5a6a40 [DAG] Fold FrameIndex offset into BaseIndexOffset analysis. NFCI. 
Relanding after restricting equalBaseIndex to not erroneuosly consider
a FrameIndices stemming from alloca from being comparable as its
offset is set post-selectionDAG.

Pull FrameIndex comparision reasoning from DAGCombiner::isAlias to
general BaseIndexOffset.

llvm-svn: 306688
 2017-06-29 15:48:11 +00:00
Nirav Dave c4ce2293b0 Revert "[DAG] Fold FrameIndex offset into BaseIndexOffset analysis. NFCI." 
This reverts commit r306498 which appears to cause a compilrt-rt test failures

llvm-svn: 306501
 2017-06-28 03:20:04 +00:00
Nirav Dave 8ef03802f1 [DAG] Fold FrameIndex offset into BaseIndexOffset analysis. NFCI. 
Pull FrameIndex comparision reasoning from DAGCombiner::isAlias to
general BaseIndexOffset.

llvm-svn: 306498
 2017-06-28 02:09:50 +00:00
Nirav Dave c1b6aa77bb [DAG] Move BaseIndexOffset into separate Libarary. NFC. 
Move BaseIndexOffset analysis out of DAGCombiner for use in other
files.

llvm-svn: 305921
 2017-06-21 15:40:43 +00:00