[llvm] 822a818 - [SLP][NFC]Add comments for the code, NFC.

[Alexey Bataev via llvm-commits]

Author: Alexey Bataev
Date: 2024-07-09T10:06:34-07:00
New Revision: 822a818786ccd726e20e2b12cbcccbf9a8f23d4c

URL: https://github.com/llvm/llvm-project/commit/822a818786ccd726e20e2b12cbcccbf9a8f23d4c
DIFF: https://github.com/llvm/llvm-project/commit/822a818786ccd726e20e2b12cbcccbf9a8f23d4c.diff

LOG: [SLP][NFC]Add comments for the code, NFC.

Added: 
    

Modified: 
    llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 9f3159244319c..4dc92419e1423 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -4099,7 +4099,10 @@ BoUpSLP::~BoUpSLP() {
   SmallVector<WeakTrackingVH> DeadInsts;
   for (auto *I : DeletedInstructions) {
     if (!I->getParent()) {
+      // Temporarily insert instruction back to erase them from parent and
+      // memory later.
       if (isa<PHINode>(I))
+        // Phi nodes must be the very first instructions in the block.
         I->insertBefore(F->getEntryBlock(),
                         F->getEntryBlock().getFirstNonPHIIt());
       else