[llvm] r321002 - [Hexagon] Prefer to widen HVX vectors instead of promoting

[Krzysztof Parzyszek via llvm-commits]

Author: kparzysz
Date: Mon Dec 18 10:21:01 2017
New Revision: 321002

URL: http://llvm.org/viewvc/llvm-project?rev=321002&view=rev
Log:
[Hexagon] Prefer to widen HVX vectors instead of promoting

Modified:
    llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.cpp
    llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.h

Modified: llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.cpp?rev=321002&r1=321001&r2=321002&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.cpp Mon Dec 18 10:21:01 2017
@@ -2323,6 +2323,18 @@ bool HexagonTargetLowering::isShuffleMas
   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

Modified: llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.h?rev=321002&r1=321001&r2=321002&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.h (original)
+++ llvm/trunk/lib/Target/Hexagon/HexagonISelLowering.h Mon Dec 18 10:21:01 2017
@@ -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;