6.3.14 U

Unknown escape \escape in string; ignored.

The string contains an unrecognized backslash-escaped character. Check that the character following the backslash is correct.

Used $at without .set noat.

This code is using the $at (assembler temporary) register, but the assembler may use it when generating synthesized macro instruction. Use the .set noat directive to tell the assembler not to quietly use this register.