[Hexagon] Prefer to widen HVX vectors instead of promoting

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321002 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Hexagon/HexagonISelLowering.cpp b/lib/Target/Hexagon/HexagonISelLowering.cpp
index 6ae52701f7f3fdf713cdd59a2b7d0deb4b92857a..6387ac2ef675ecdf36d6c14b6e31a6ee8eee188e 100644 (file)
--- a/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -2323,6 +2323,18 @@ bool HexagonTargetLowering::isShuffleMaskLegal(ArrayRef<int> Mask,
   return true;
 }
 
+TargetLoweringBase::LegalizeTypeAction
+HexagonTargetLowering::getPreferredVectorAction(EVT VT) const {
+  if (Subtarget.useHVXOps()) {
+    // If the size of VT is at least half of the vector length,
+    // widen the vector. Note: the threshold was not selected in
+    // any scientific way.
+    if (VT.getSizeInBits() >= Subtarget.getVectorLength()*8/2)
+      return TargetLoweringBase::TypeWidenVector;
+  }
+  return TargetLowering::getPreferredVectorAction(VT);
+}
+
 // Lower a vector shuffle (V1, V2, V3).  V1 and V2 are the two vectors
 // to select data from, V3 is the permutation.
 SDValue

diff --git a/lib/Target/Hexagon/HexagonISelLowering.h b/lib/Target/Hexagon/HexagonISelLowering.h
index 07f8b0c9c14edc0d8d54c53c547453032a9111b8..2705fcbf8d64e99b1f5128a595b8ba4fe3d6bb66 100644 (file)
--- a/lib/Target/Hexagon/HexagonISelLowering.h
+++ b/lib/Target/Hexagon/HexagonISelLowering.h
@@ -122,6 +122,8 @@ namespace HexagonISD {
         unsigned DefinedValues) const override;
 
     bool isShuffleMaskLegal(ArrayRef<int> Mask, EVT VT) const override;
+    TargetLoweringBase::LegalizeTypeAction getPreferredVectorAction(EVT VT)
+        const override;
 
     SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
     const char *getTargetNodeName(unsigned Opcode) const override;