[llvm] [SLP] NFC. Remove the redundant MainOp and AltOp find process. (PR #133642)

[Han-Kuan Chen via llvm-commits]

https://github.com/HanKuanChen created https://github.com/llvm/llvm-project/pull/133642

None

>From d86adb499256f48934082519c44f320967348d26 Mon Sep 17 00:00:00 2001
From: Han-Kuan Chen <hankuan.chen at sifive.com>
Date: Sun, 30 Mar 2025 09:10:56 -0700
Subject: [PATCH] [SLP] NFC. Remove the redundant MainOp and AltOp find
 process.

---
 llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 850895895d44d..a4b0378abc075 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -3733,16 +3733,8 @@ class BoUpSLP {
       Last->ReorderIndices.append(ReorderIndices.begin(), ReorderIndices.end());
     }
     if (EntryState == TreeEntry::SplitVectorize) {
-      auto *MainOp =
-          cast<Instruction>(*find_if(Last->Scalars, IsaPred<Instruction>));
-      auto *AltOp = cast<Instruction>(*find_if(Last->Scalars, [=](Value *V) {
-        auto *I = dyn_cast<Instruction>(V);
-        if (!I)
-          return false;
-        InstructionsState LocalS = getSameOpcode({I, MainOp}, *TLI);
-        return !LocalS || LocalS.isAltShuffle();
-      }));
-      Last->setOperations(InstructionsState(MainOp, AltOp));
+      assert(S && "Split nodes must have operations.");
+      Last->setOperations(S);
       SmallPtrSet<Value *, 4> Processed;
       for (Value *V : VL) {
         auto *I = dyn_cast<Instruction>(V);