From 67ca5dad16e9271e62987f7c563b109a07dc8788 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Tue, 19 Aug 2025 09:09:11 -0700
Subject: [PATCH] [polly] Replace SmallSet with SmallPtrSet (NFC) (#154367)

This patch replaces SmallSet<T *, N> with SmallPtrSet<T *, N>.  Note
that SmallSet.h "redirects" SmallSet to SmallPtrSet for pointer
element types:

  template <typename PointeeType, unsigned N>
class SmallSet<PointeeType*, N> : public SmallPtrSet<PointeeType*, N>
{};

We only have 10 instances that rely on this "redirection". Since the
redirection doesn't improve readability, this patch replaces SmallSet
with SmallPtrSet for pointer element types.

I'm planning to remove the redirection eventually.
---
 polly/lib/Analysis/ScopBuilder.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/polly/lib/Analysis/ScopBuilder.cpp b/polly/lib/Analysis/ScopBuilder.cpp
index c0babb85f5c4..67a4c4345580 100644
--- a/polly/lib/Analysis/ScopBuilder.cpp
+++ b/polly/lib/Analysis/ScopBuilder.cpp
@@ -689,7 +689,7 @@ isl::set ScopBuilder::getPredecessorDomainConstraints(BasicBlock *BB,
 
   // Set of regions of which the entry block domain has been propagated to BB.
   // all predecessors inside any of the regions can be skipped.
-  SmallSet<Region *, 8> PropagatedRegions;
+  SmallPtrSet<Region *, 8> PropagatedRegions;
 
   for (auto *PredBB : predecessors(BB)) {
     // Skip backedges.