[llvm] f739aa4 - [VectorCombine] replaceValue - add "VC: Replacing" debug message to help the log show replacement for old/new.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2025-01-02T17:23:13Z
New Revision: f739aa4004165dc64d3a1f418d5ad3c84886f01a

URL: https://github.com/llvm/llvm-project/commit/f739aa4004165dc64d3a1f418d5ad3c84886f01a
DIFF: https://github.com/llvm/llvm-project/commit/f739aa4004165dc64d3a1f418d5ad3c84886f01a.diff

LOG: [VectorCombine] replaceValue - add "VC: Replacing" debug message to help the log show replacement for old/new.

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
index dd109637552c4c..8509a31766e358 100644
--- a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
+++ b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
@@ -128,6 +128,8 @@ class VectorCombine {
   bool shrinkType(Instruction &I);
 
   void replaceValue(Value &Old, Value &New) {
+    LLVM_DEBUG(dbgs() << "VC: Replacing: " << Old << '\n');
+    LLVM_DEBUG(dbgs() << "         With: " << New << '\n');
     Old.replaceAllUsesWith(&New);
     if (auto *NewI = dyn_cast<Instruction>(&New)) {
       New.takeName(&Old);