[llvm] [SLP] Use named structs in vectorizeStores() (NFC) (PR #132781)

[Gaëtan Bossu via llvm-commits]

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@@ -19945,6 +19945,41 @@ static bool checkTreeSizes(ArrayRef<std::pair<unsigned, unsigned>> Sizes,
   return Dev * 96 / (Mean * Mean) == 0;
 }
 
+namespace {
+
+/// A group of instructions that we'll try to bundle together using vector ops.
+/// They are ordered using the signed distance of their address operand to the
+/// address of this group's BaseInstr.
+struct RelatedStoreInsts {
+  RelatedStoreInsts(unsigned BaseInstrIdx) { reset(BaseInstrIdx); }
+  void reset(unsigned NewBaseInstr) {
+    BaseInstrIdx = NewBaseInstr;
+    Instrs.clear();
+    insert(NewBaseInstr, 0);
+  }
+
+  void insert(unsigned InstrIdx, int PtrDist) {
+    Instrs.emplace(PtrDist, InstrIdx);
+  }
+
+  /// Return the instruction with a pointer distance of \p PtrDist, or nullopt.
+  std::optional<unsigned> getInstIdx(int PtrDist) const {
+    auto It = Instrs.find(PtrDist);
+    if (It != Instrs.end())
+      return It->second;
+    return std::nullopt;
+  }
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gbossu wrote:

Yes I had something similar locally, I'll push it today.

https://github.com/llvm/llvm-project/pull/132781