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[DAG] Add ShuffleVectorSDNode::getSplatMaskIndex static helper #129731

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Merged
merged 1 commit into from
Mar 5, 2025
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[DAG] Add ShuffleVectorSDNode::getSplatMaskIndex static helper #129731

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13 changes: 7 additions & 6 deletions llvm/include/llvm/CodeGen/SelectionDAGNodes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1663,10 +1663,13 @@ class ShuffleVectorSDNode : public SDNode {

bool isSplat() const { return isSplatMask(getMask()); }

int getSplatIndex() const {
assert(isSplat() && "Cannot get splat index for non-splat!");
EVT VT = getValueType(0);
for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
int getSplatIndex() const { return getSplatMaskIndex(getMask()); }

static bool isSplatMask(ArrayRef<int> Mask);

static int getSplatMaskIndex(ArrayRef<int> Mask) {
assert(isSplatMask(Mask) && "Cannot get splat index for non-splat!");
for (unsigned i = 0, e = Mask.size(); i != e; ++i)
if (Mask[i] >= 0)
return Mask[i];

Expand All @@ -1675,8 +1678,6 @@ class ShuffleVectorSDNode : public SDNode {
return 0;
}

static bool isSplatMask(ArrayRef<int> Mask);

/// Change values in a shuffle permute mask assuming
/// the two vector operands have swapped position.
static void commuteMask(MutableArrayRef<int> Mask) {
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