GlobalISel: Implement fewerElementsVector for shifts

Introduce a new function which handles instructions with multiple type
indices, but have the same number of vector elements.

Also legalize v2s16 shifts when applicable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353432 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h b/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
index 729249ce30b..6a174d116f6 100644
--- a/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
+++ b/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
@@ -157,6 +157,12 @@ private:
   LegalizeResult fewerElementsVectorBasic(MachineInstr &MI, unsigned TypeIdx,
                                           LLT NarrowTy);
 
+  /// Legalize a instruction with a vector type where each operand may have a
+  /// different element type. All type indexes must have the same number of
+  /// elements.
+  LegalizeResult fewerElementsVectorMultiEltType(MachineInstr &MI,
+                                                 unsigned TypeIdx, LLT NarrowTy);
+
   LegalizeResult fewerElementsVectorCasts(MachineInstr &MI, unsigned TypeIdx,
                                           LLT NarrowTy);