From 75fd508582909170210d942ff07fd8e61bf8c913 Mon Sep 17 00:00:00 2001
From: Niko Savola <nikosavola@taaraconnect.com>
Date: Wed, 3 Jun 2026 14:58:11 +0300
Subject: [PATCH] Leverage execution policies inside `dbAsIfFlatRegion` object
 traversal

---
 src/db/db/dbAsIfFlatRegion.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/db/db/dbAsIfFlatRegion.cc b/src/db/db/dbAsIfFlatRegion.cc
index 1886f26ab..9916727f6 100644
--- a/src/db/db/dbAsIfFlatRegion.cc
+++ b/src/db/db/dbAsIfFlatRegion.cc
@@ -43,6 +43,14 @@
 #include "dbLayoutToNetlist.h"
 
 #include <sstream>
+#include <algorithm>
+
+#if defined(__cpp_lib_execution)
+#include <execution>
+#define PARALLEL_EXEC_POLICY std::execution::par,
+#else
+#define PARALLEL_EXEC_POLICY
+#endif
 
 namespace db
 {
@@ -440,7 +448,7 @@ void AsIfFlatRegion::merge_polygons_to (db::Shapes &output, bool min_coherence,
       addressable_polygons.inc ();
     }
 
-    std::sort (polygons_by_prop_id.begin (), polygons_by_prop_id.end (), ComparePolygonsWithProperties ());
+    std::sort (PARALLEL_EXEC_POLICY polygons_by_prop_id.begin (), polygons_by_prop_id.end (), ComparePolygonsWithProperties ());
 
     for (auto p = polygons_by_prop_id.begin (); p != polygons_by_prop_id.end (); ) {