[llvm] [VPlan] Introduce recipes for VP loads and stores. (PR #87816)

[via llvm-commits]

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@@ -9590,10 +9467,148 @@ void VPWidenMemoryInstructionRecipe::execute(VPTransformState &State) {
         NewLI = Builder.CreateVectorReverse(NewLI, "reverse");
     }
 
-    State.set(getVPSingleValue(), NewLI, Part);
+    State.set(this, NewLI, Part);
+  }
+}
+
+void VPWidenVPLoadRecipe::execute(VPTransformState &State) {
+  assert(State.UF == 1 && "Expected only UF == 1 when vectorizing with "
+                          "explicit vector length.");
+  // FIXME: Support reverse loading after vp_reverse is added.
+  assert(!isReverse() && "Reverse loads are not implemented yet.");
+
+  // Attempt to issue a wide load.
+  auto *LI = cast<LoadInst>(&Ingredient);
+
+  Type *ScalarDataTy = getLoadStoreType(&Ingredient);
+  auto *DataTy = VectorType::get(ScalarDataTy, State.VF);
+  const Align Alignment = getLoadStoreAlignment(&Ingredient);
+  bool CreateGather = !isConsecutive();
+
+  auto &Builder = State.Builder;
+  // Handle loads.
+  assert(LI && "Must have a load instruction");
+  State.setDebugLocFrom(getDebugLoc());
+  for (unsigned Part = 0; Part < State.UF; ++Part) {
+    CallInst *NewLI;
+    Value *EVL = State.get(getEVL(), VPIteration(0, 0));
+    Value *Addr = State.get(getAddr(), Part, !CreateGather);
+    Value *Mask =
+        getMask()
+            ? State.get(getMask(), Part)
+            : Mask = Builder.CreateVectorSplat(State.VF, Builder.getTrue());
+    if (CreateGather) {
+      NewLI = Builder.CreateIntrinsic(DataTy, Intrinsic::vp_gather,
+                                      {Addr, Mask, EVL}, nullptr,
+                                      "wide.masked.gather");
+    } else {
+      VectorBuilder VBuilder(Builder);
+      VBuilder.setEVL(EVL).setMask(Mask);
+      NewLI = cast<CallInst>(VBuilder.createVectorInstruction(
+          Instruction::Load, DataTy, Addr, "vp.op.load"));
+    }
+    NewLI->addParamAttr(
+        0, Attribute::getWithAlignment(NewLI->getContext(), Alignment));
+
+    // Add metadata to the load.
----------------
ayalz wrote:

Does this comment add any information?

https://github.com/llvm/llvm-project/pull/87816