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3 Commits

Author SHA1 Message Date
Johannes Doerfert 4cf1580f0c [FIX] Check the next base pointer for possible invariant loads 
A load can only be invariant if its base pointer is invariant too. To
  this end, we check if the base pointer is defined inside the region or
  outside. In the former case we recursively check if we can (and
  therefore will) hoist the base pointer too. Only if that happends we
  can hoist the load.

llvm-svn: 260886
 2016-02-15 12:42:05 +00:00
Johannes Doerfert f69162486b Revert "[FIX] Hoist accesses if AA stated they are invariant" 
This reverts commit 98efa006c96ac981c00d2e386ec1102bce9f549a.

  The fix was broken since we do not use AA in the ScopDetection anymore to
  check for invariant accesses.

llvm-svn: 260884
 2016-02-15 12:21:11 +00:00
Johannes Doerfert 2353e39e1f [FIX] Hoist accesses if AA stated they are invariant 
Before this patch it could happen that we did not hoist a load that
  was a base pointer of another load even though AA already declared the
  first one as invariant (during ScopDetection). If this case arises we
  will now skipt the "can be overwriten" check because in this case the
  over-approximating nature causes us to generate broken code.

llvm-svn: 260862
 2016-02-14 23:37:14 +00:00