Neon file can not be compiled by aarch64 arm cpu.

Recently, I tried to compile x265 on Nvidia Jetson TX2 board. And I turned on ENABLE_ASSEMBLY option. But the program can not be compiled successfully. It seems like that the assembly files which use 32 bit neon instruction can not be compiled in Jetson TX2. The CPU on TX2 is arm A57 with 64 bit neon instruction. How to figure out this problem?