diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 4ef1993..e4bfc4a 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -4652,6 +4652,21 @@
   [(set_attr "type" "fp")
    (set_attr "isa" "*,<Fisa>")])
 
+(define_expand "add_truncdfsf3"
+  [(set (float_extend:DF (match_operand:SF 0 "gpc_reg_operand"))
+	(plus:DF (match_operand:DF 1 "gpc_reg_operand")
+		 (match_operand:DF 2 "gpc_reg_operand")))]
+  "TARGET_HARD_FLOAT"
+  "")
+
+(define_insn "*add_truncdfsf3_fpr"
+  [(set (float_extend:DF (match_operand:SF 0 "gpc_reg_operand" "=<Ff>"))
+	(plus:DF (match_operand:DF 1 "gpc_reg_operand" "%<Ff>")
+		 (match_operand:DF 2 "gpc_reg_operand" "<Ff>")))]
+  "TARGET_HARD_FLOAT"
+  "fadd %0,%1,%2"
+  [(set_attr "type" "fp")])
+
 (define_expand "sub<mode>3"
   [(set (match_operand:SFDF 0 "gpc_reg_operand")
 	(minus:SFDF (match_operand:SFDF 1 "gpc_reg_operand")
diff --git a/gcc/optabs.def b/gcc/optabs.def
index 4ffd0f3..45be794 100644
--- a/gcc/optabs.def
+++ b/gcc/optabs.def
@@ -67,6 +67,7 @@ OPTAB_CD(sfixtrunc_optab, "fix_trunc$F$b$I$a2")
 OPTAB_CD(ufixtrunc_optab, "fixuns_trunc$F$b$I$a2")
 
 /* Misc optabs that use two modes; model them as "conversions".  */
+OPTAB_CD(fadd_optab, "add_trunc$b$a3")
 OPTAB_CD(smul_widen_optab, "mul$b$a3")
 OPTAB_CD(umul_widen_optab, "umul$b$a3")
 OPTAB_CD(usmul_widen_optab, "usmul$b$a3")