From c1dd082048dae08e8276d131e572e2a87bdd8f6e Mon Sep 17 00:00:00 2001
From: Matthew Craven <clyring@gmail.com>
Date: Thu, 4 Jan 2024 16:14:38 -0500
Subject: [PATCH] Use copyMutableByteArrayNonOverlapping# when available

---
 Data/Primitive/ByteArray.hs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Data/Primitive/ByteArray.hs b/Data/Primitive/ByteArray.hs
index 25daddb..31272a5 100644
--- a/Data/Primitive/ByteArray.hs
+++ b/Data/Primitive/ByteArray.hs
@@ -425,7 +425,13 @@ copyMutableByteArray
 {-# INLINE copyMutableByteArray #-}
 copyMutableByteArray (MutableByteArray dst#) doff
                      (MutableByteArray src#) soff sz
-  = primitive_ (copyMutableByteArray# src# (unI# soff) dst# (unI# doff) (unI# sz))
+  = primitive_ (op src# (unI# soff) dst# (unI# doff) (unI# sz))
+  where
+#if MIN_VERSION_base(4,19,0)
+    op = copyMutableByteArrayNonOverlapping#
+#else
+    op = copyMutableByteArray#
+#endif
 
 -- | Copy a slice of a byte array to an unmanaged pointer address. These must not
 -- overlap. The offset and length are given in elements, not in bytes.