Error of unknown opcode

[teckhaokoh]

Hi, does anyone got the compile error as below before:

/tmp/ccQELocI.s: Assembler messages:
/tmp/ccQELocI.s:1697: Error: unknown opcode or format name 'ssiu'
/tmp/ccQELocI.s:1707: Error: unknown opcode or format name 'ssiu'

[teckhaokoh]

I just downloaded the crossNG toolchain source code, it seems that something related to it.
It seems to have something to do with the xtensa.md