[llvm] [SLP] NFC. Reduce newTreeEntry usage. (PR #92994)

[Han-Kuan Chen via llvm-commits]

https://github.com/HanKuanChen created https://github.com/llvm/llvm-project/pull/92994

None

>From 834da60ba2e34de5780d64be39e9c246033b9d37 Mon Sep 17 00:00:00 2001
From: Han-Kuan Chen <hankuan.chen at sifive.com>
Date: Tue, 21 May 2024 22:00:32 -0700
Subject: [PATCH] [SLP] NFC. Reduce newTreeEntry usage.

---
 .../Transforms/Vectorize/SLPVectorizer.cpp    | 47 ++++++-------------
 1 file changed, 15 insertions(+), 32 deletions(-)

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 140a1b1ffbafe..aa6d1f431acb6 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -6861,23 +6861,16 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
     case Instruction::ExtractElement: {
       if (CurrentOrder.empty()) {
         LLVM_DEBUG(dbgs() << "SLP: Reusing or shuffling extract sequence.\n");
-        newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
-                     ReuseShuffleIndices);
-        // This is a special case, as it does not gather, but at the same time
-        // we are not extending buildTree_rec() towards the operands.
-        ValueList Op0;
-        Op0.assign(VL.size(), VL0->getOperand(0));
-        VectorizableTree.back()->setOperand(0, Op0);
-        return;
+      } else {
+        LLVM_DEBUG({
+          dbgs() << "SLP: Reusing or shuffling of reordered extract sequence "
+                    "with order";
+          for (unsigned Idx : CurrentOrder)
+            dbgs() << " " << Idx;
+          dbgs() << "\n";
+        });
+        fixupOrderingIndices(CurrentOrder);
       }
-      LLVM_DEBUG({
-        dbgs() << "SLP: Reusing or shuffling of reordered extract sequence "
-                  "with order";
-        for (unsigned Idx : CurrentOrder)
-          dbgs() << " " << Idx;
-        dbgs() << "\n";
-      });
-      fixupOrderingIndices(CurrentOrder);
       // Insert new order with initial value 0, if it does not exist,
       // otherwise return the iterator to the existing one.
       newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
@@ -6931,28 +6924,18 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
       fixupOrderingIndices(CurrentOrder);
       switch (State) {
       case TreeEntry::Vectorize:
-        if (CurrentOrder.empty()) {
-          // Original loads are consecutive and does not require reordering.
-          TE = newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
-                            ReuseShuffleIndices);
+        TE = newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
+                          ReuseShuffleIndices, CurrentOrder);
+        if (CurrentOrder.empty())
           LLVM_DEBUG(dbgs() << "SLP: added a vector of loads.\n");
-        } else {
-          // Need to reorder.
-          TE = newTreeEntry(VL, Bundle /*vectorized*/, S, UserTreeIdx,
-                            ReuseShuffleIndices, CurrentOrder);
+        else
           LLVM_DEBUG(dbgs() << "SLP: added a vector of jumbled loads.\n");
-        }
         TE->setOperandsInOrder();
         break;
       case TreeEntry::StridedVectorize:
         // Vectorizing non-consecutive loads with `llvm.masked.gather`.
-        if (CurrentOrder.empty()) {
-          TE = newTreeEntry(VL, TreeEntry::StridedVectorize, Bundle, S,
-                            UserTreeIdx, ReuseShuffleIndices);
-        } else {
-          TE = newTreeEntry(VL, TreeEntry::StridedVectorize, Bundle, S,
-                            UserTreeIdx, ReuseShuffleIndices, CurrentOrder);
-        }
+        TE = newTreeEntry(VL, TreeEntry::StridedVectorize, Bundle, S,
+                          UserTreeIdx, ReuseShuffleIndices, CurrentOrder);
         TE->setOperandsInOrder();
         LLVM_DEBUG(dbgs() << "SLP: added a vector of strided loads.\n");
         break;