diff --git a/gcc10-pr94254.patch b/gcc10-pr94254.patch
new file mode 100644
index 0000000..408b90a
--- /dev/null
+++ b/gcc10-pr94254.patch
@@ -0,0 +1,24 @@
+2020-03-23  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR target/94254
+	* config/rs6000/rs6000.c (rs6000_can_change_mode_class): Allow
+	FPRs to change between SDmode and DDmode.
+
+--- gcc/config/rs6000/rs6000.c
++++ gcc/config/rs6000/rs6000.c
+@@ -12307,6 +12307,15 @@ rs6000_can_change_mode_class (machine_mode from,
+ 	  if (!BYTES_BIG_ENDIAN && (to == TDmode || from == TDmode))
+ 	    return false;
+ 
++	  /* Allow SD<->DD changes, since SDmode values are stored in
++	     the low half of the DDmode, just like target-independent
++	     code expects.  We need to allow at least SD->DD since
++	     rs6000_secondary_memory_needed_mode asks for that change
++	     to be made for SD reloads.  */
++	  if ((to == DDmode && from == SDmode)
++	      || (to == SDmode && from == DDmode))
++	    return true;
++
+ 	  if (from_size < 8 || to_size < 8)
+ 	    return false;
+