diff --git a/llvm/include/llvm/ADT/APInt.h b/llvm/include/llvm/ADT/APInt.h
--- a/llvm/include/llvm/ADT/APInt.h
+++ b/llvm/include/llvm/ADT/APInt.h
@@ -430,6 +430,11 @@
     return countPopulationSlowCase() == 1;
   }
 
+  /// Check if this APInt's negated value is a power of two greater than zero.
+  bool isNegatedPowerOf2() const {
+    return (-*this).isPowerOf2();
+  }
+
   /// Check if the APInt's value is returned by getSignMask.
   ///
   /// \returns true if this is the value returned by getSignMask.
diff --git a/llvm/include/llvm/IR/PatternMatch.h b/llvm/include/llvm/IR/PatternMatch.h
--- a/llvm/include/llvm/IR/PatternMatch.h
+++ b/llvm/include/llvm/IR/PatternMatch.h
@@ -549,7 +549,7 @@
 }
 
 struct is_negated_power2 {
-  bool isValue(const APInt &C) { return (-C).isPowerOf2(); }
+  bool isValue(const APInt &C) { return C.isNegatedPowerOf2(); }
 };
 /// Match a integer or vector negated power-of-2.
 /// For vectors, this includes constants with undefined elements.
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3841,7 +3841,7 @@
   }
 
   // fold (mul x, -(1 << c)) -> -(x << c) or (-x) << c
-  if (N1IsConst && !N1IsOpaqueConst && (-ConstValue1).isPowerOf2()) {
+  if (N1IsConst && !N1IsOpaqueConst && ConstValue1.isNegatedPowerOf2()) {
     unsigned Log2Val = (-ConstValue1).logBase2();
     SDLoc DL(N);
     // FIXME: If the input is something that is easily negated (e.g. a
@@ -4212,7 +4212,7 @@
       return false;
     if (C->getAPIntValue().isPowerOf2())
       return true;
-    if ((-C->getAPIntValue()).isPowerOf2())
+    if (C->getAPIntValue().isNegatedPowerOf2())
       return true;
     return false;
   };
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -4150,7 +4150,7 @@
           N0.getOpcode() == ISD::AND && N0.hasOneUse()) {
         if (auto *AndRHS = dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
           const APInt &AndRHSC = AndRHS->getAPIntValue();
-          if ((-AndRHSC).isPowerOf2() && (AndRHSC & C1) == C1) {
+          if (AndRHSC.isNegatedPowerOf2() && (AndRHSC & C1) == C1) {
             unsigned ShiftBits = AndRHSC.countTrailingZeros();
             if (!TLI.shouldAvoidTransformToShift(ShValTy, ShiftBits)) {
               SDValue Shift =
diff --git a/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
--- a/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
@@ -620,7 +620,7 @@
     ConstantInt *Exponent = ConstantInt::get(DeltaType, IndexOffset.logBase2());
     return Builder.CreateShl(ExtendedStride, Exponent);
   }
-  if ((-IndexOffset).isPowerOf2()) {
+  if (IndexOffset.isNegatedPowerOf2()) {
     // If (i - i') is a power of 2, Bump = -sext/trunc(S) << log(i' - i).
     ConstantInt *Exponent =
         ConstantInt::get(DeltaType, (-IndexOffset).logBase2());
diff --git a/llvm/unittests/ADT/APIntTest.cpp b/llvm/unittests/ADT/APIntTest.cpp
--- a/llvm/unittests/ADT/APIntTest.cpp
+++ b/llvm/unittests/ADT/APIntTest.cpp
@@ -1785,6 +1785,27 @@
   }
 }
 
+TEST(APIntTest, isNegatedPowerOf2) {
+  EXPECT_FALSE(APInt(5, 0x00).isNegatedPowerOf2());
+  EXPECT_TRUE(APInt(16, 0xfffe).isNegatedPowerOf2());
+  EXPECT_TRUE(APInt(16, 0xfffc).isNegatedPowerOf2());
+  EXPECT_TRUE(APInt(32, 0xffffffff).isNegatedPowerOf2());
+
+  for (int N : {1, 2, 3, 4, 7, 8, 16, 32, 64, 127, 128, 129, 256}) {
+    EXPECT_FALSE(APInt(N, 0).isNegatedPowerOf2());
+    EXPECT_TRUE((-APInt::getSignedMinValue(N)).isNegatedPowerOf2());
+
+    APInt One(N, 1);
+    for (int I = 1; I < N - 1; ++I) {
+      EXPECT_FALSE(APInt::getOneBitSet(N, I).isNegatedPowerOf2());
+      EXPECT_TRUE((-APInt::getOneBitSet(N, I)).isNegatedPowerOf2());
+
+      APInt MaskVal = One.shl(I);
+      EXPECT_TRUE((-MaskVal).isNegatedPowerOf2());
+    }
+  }
+}
+
 // Test that self-move works with EXPENSIVE_CHECKS. It calls std::shuffle which
 // does self-move on some platforms.
 #ifdef EXPENSIVE_CHECKS