MIPS32 DSP instructions not lifted #4009
Description
MIPS5 (and 4?) have optional DSP instructions. As is typical of DSP instruction sets, there's lots of them, most of which are rare outside actual DSP code. However, some compilers appear to frequently generate DSP instructions for normal, pure-integer C code. BN hits these during analysis, believes they're undefined, and terminates the function there.
The culprits here appear to be the "load byte/hword/word indexed" instructions (LBUX, LHX, LWX)- which just load from an address calculated as the sum of two registers (i.e. foo = mem.d[bar+baz];).