> In target-i386/translate.c there are this instructions: > int op, f, val; > op = (b >> 3) & 7; > f = (b >> 1) & 3; > if ((b & 1) == 0) > ot = OT_BYTE; > else > ot = dflag + OT_WORD; > What does this code do??
It extracts some useful subfields from one-byte opcodes, e.g. op is the arithmetic operation code, f is operand encoding and ot is operand width. Table A2 in the Intel® 64 and IA-32 Architectures Developer's Manual: Vol. 2B http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-vol-2b-manual.html will probably help. -- Thanks. -- Max
