2 files changed, 12 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index efa97b4200f..c1668dcb5b7 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -10736,6 +10736,15 @@ bool ARMTargetLowering::shouldFoldConstantShiftPairToMask(
   return false;
 }
 
+bool ARMTargetLowering::preferIncOfAddToSubOfNot(EVT VT) const {
+  if (!Subtarget->hasNEON()) {
+    if (Subtarget->isThumb1Only())
+      return VT.getScalarSizeInBits() <= 32;
+    return true;
+  }
+  return VT.isScalarInteger();
+}
+
 static SDValue PerformSHLSimplify(SDNode *N,
                                 TargetLowering::DAGCombinerInfo &DCI,
                                 const ARMSubtarget *ST) {
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.h b/llvm/lib/Target/ARM/ARMISelLowering.h
index d188ad2facb..906e10d5f4c 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.h
+++ b/llvm/lib/Target/ARM/ARMISelLowering.h
@@ -608,6 +608,9 @@ class VectorType;
 
     bool shouldFoldConstantShiftPairToMask(const SDNode *N,
                                            CombineLevel Level) const override;
+
+    bool preferIncOfAddToSubOfNot(EVT VT) const override;
+
   protected:
     std::pair<const TargetRegisterClass *, uint8_t>
     findRepresentativeClass(const TargetRegisterInfo *TRI,