REX_X             517 third_party/mach_override/libudis86/decode.c       op->index = UD_R_RAX + (SIB_I(inp_curr(u)) | (REX_X(u->pfx_rex) << 3));
REX_X             555 third_party/mach_override/libudis86/decode.c       op->index = UD_R_EAX + (SIB_I(inp_curr(u)) | (REX_X(u->pfx_rex) << 3));