From 9bdce8b08522744b8b939ff4a72c280263e07e99 Mon Sep 17 00:00:00 2001
From: Christian Zimmermann <christian.zimmermann@ur.de>
Date: Mon, 27 Jan 2025 16:45:05 -0800
Subject: [PATCH] prange: do not create a separate prange that covers the same
 space as its original range; return original range instead

---
 src/include/ranges/prange.cc.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/include/ranges/prange.cc.h b/src/include/ranges/prange.cc.h
index f4ce85c..bc0a40d 100644
--- a/src/include/ranges/prange.cc.h
+++ b/src/include/ranges/prange.cc.h
@@ -405,7 +405,12 @@ namespace CNORXZ
     template <class RangeT>
     RangePtr prange(const Sptr<RangeT>& range, const Vector<SizeT>& parts)
     {
-	return PRangeFactory<RangeT>(range,parts).create();
+	if(parts.size() == range->size()){
+	    return range; // avoid PRange that is identical to its original range
+	}
+	else {
+	    return PRangeFactory<RangeT>(range,parts).create();
+	}
     }
 
 }