If this option is on, IDA will check that unused fields of instructions are filled by zeroes. If they are not, it will refuse to disassemble the instruction. If this option is on, IDA will simplify instructions and replace them by clearer pseudo-instructions. For example, or %g0, regimm, x will be replaced by mov regimm, x If this option is on, IDA will try to combine several instructions into a macro instruction. For example, sethi %hi(value), %rd or %rd, %lo(value), %rd will be replaced by set value, %rd IDA uses the following conversions: 1.sethi %hi(value), %rx lduw [%rx+%lo(value)], %ry => lduw value, %ry 2.sethi %hi(value), %rx stw %ry, [%rx+%lo(value)] => stw %ry, value 3.sethi %hi(value), %rx or %rx, %lo(value), %rd => setuw value, %rd 4.sethi %hi(value), %rx add %rx, %lo(value), %rd => setuw value, %rd This option requires the previous option to be turned on. If this option is on, IDA will disassemble V8 instructions.