target-mips: Fix Loongson pandn instruction.

pandn FD, FS, FT
Operation: FD = ((NOT FS) AND FT)
Signed-off-by: NHeiher <wangr@lemote.com>
Signed-off-by: NFuxin Zhang <zhangfx@lemote.com>
Reviewed-by: NYongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: NYongbok Kim <yongbok.kim@imgtec.com>

target-mips/translate.c

@@ -3945,9 +3945,12 @@ static void gen_loongson_multimedia(DisasContext *ctx, int rd, int rs, int rt)
     LMI_DIRECT(XOR_CP2, xor, xor);
     LMI_DIRECT(NOR_CP2, nor, nor);
     LMI_DIRECT(AND_CP2, and, and);
-    LMI_DIRECT(PANDN, pandn, andc);
     LMI_DIRECT(OR, or, or);
 
+    case OPC_PANDN:
+        tcg_gen_andc_i64(t0, t1, t0);
+        break;
+
     case OPC_PINSRH_0:
         tcg_gen_deposit_i64(t0, t0, t1, 0, 16);
         break;