diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index eba1a8963233..4b71bea394f3 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -2138,7 +2138,7 @@
 			 (match_operand:SI 2 "const_int_operand" "i"))
 	(lshiftrt:SI (match_operand:SI 3 "gpc_reg_operand" "r")
 		     (match_operand:SI 4 "const_int_operand" "i")))]
-  ""
+  "(32 - INTVAL (operands[4])) >= INTVAL (operands[1])"
   "*
 {
   int shift = INTVAL (operands[4]) & 31;