-// Hide this symbol with an anonymous namespace instead of 'static' so that MSVC
-// 2013 will allow us to use it as a non-type template parameter.
-namespace {
-
-/// \brief Implementation of the \c isShuffleEquivalent variadic functor.
-///
-/// See its documentation for details.
-bool isShuffleEquivalentImpl(SDValue V1, SDValue V2, ArrayRef<int> Mask,
- ArrayRef<const int *> Args) {
- if (Mask.size() != Args.size())
- return false;
-
- // If the values are build vectors, we can look through them to find
- // equivalent inputs that make the shuffles equivalent.
- auto *BV1 = dyn_cast<BuildVectorSDNode>(V1);
- auto *BV2 = dyn_cast<BuildVectorSDNode>(V2);
-
- for (int i = 0, e = Mask.size(); i < e; ++i) {
- assert(*Args[i] >= 0 && "Arguments must be positive integers!");
- if (Mask[i] != -1 && Mask[i] != *Args[i]) {
- auto *MaskBV = Mask[i] < e ? BV1 : BV2;
- auto *ArgsBV = *Args[i] < e ? BV1 : BV2;
- if (!MaskBV || !ArgsBV ||
- MaskBV->getOperand(Mask[i] % e) != ArgsBV->getOperand(*Args[i] % e))
- return false;
- }
+/// \brief Base case helper for testing a single mask element.
+static bool isShuffleEquivalentImpl(SDValue V1, SDValue V2,
+ BuildVectorSDNode *BV1,
+ BuildVectorSDNode *BV2, ArrayRef<int> Mask,
+ int i, int Arg) {
+ int Size = Mask.size();
+ if (Mask[i] != -1 && Mask[i] != Arg) {
+ auto *MaskBV = Mask[i] < Size ? BV1 : BV2;
+ auto *ArgsBV = Arg < Size ? BV1 : BV2;
+ if (!MaskBV || !ArgsBV ||
+ MaskBV->getOperand(Mask[i] % Size) != ArgsBV->getOperand(Arg % Size))
+ return false;