[SLP]Mark smin reduction as signed compare

Reduction signed min must be marked as signed compare, fixing the
analysis for the cases, where the incoming arguments are unsigned.

Fixes #133943

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 50c4039..f7c37d8 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -20170,6 +20170,10 @@ void BoUpSLP::computeMinimumValueSizes() {
     IsTruncRoot = true;
   }
   bool IsSignedCmp = false;
+  if (UserIgnoreList && all_of(*UserIgnoreList, [](Value *V) {
+        return match(V, m_SMin(m_Value(), m_Value()));
+      }))
+    IsSignedCmp = true;
   while (NodeIdx < VectorizableTree.size()) {
     ArrayRef<Value *> TreeRoot = VectorizableTree[NodeIdx]->Scalars;
     unsigned Limit = 2;