[LV] Support vectorization of interleave-groups that require an epilog under

optsize using masked wide loads 

Under Opt for Size, the vectorizer does not vectorize interleave-groups that
have gaps at the end of the group (such as a loop that reads only the even
elements: a[2*i]) because that implies that we'll require a scalar epilogue
(which is not allowed under Opt for Size). This patch extends the support for
masked-interleave-groups (introduced by D53011 for conditional accesses) to
also cover the case of gaps in a group of loads; Targets that enable the
masked-interleave-group feature don't have to invalidate interleave-groups of
loads with gaps; they could now use masked wide-loads and shuffles (if that's
what the cost model selects).

Reviewers: Ayal, hsaito, dcaballe, fhahn

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D53668

llvm-svn: 345705

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
index 347a8a632f0..406f075c8a6 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
@@ -93,7 +93,9 @@ public:
                                  unsigned Factor,
                                  ArrayRef<unsigned> Indices,
                                  unsigned Alignment,
-                                 unsigned AddressSpace, bool IsMasked = false);
+                                 unsigned AddressSpace,
+                                 bool UseMaskForCond = false,
+                                 bool UseMaskForGaps = false);
   /// @}
 };