If checked, IDA will use mnemonic names of the registers, like a0, a1, t0, v0... 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 r5, r0, r4 will be replaced by move r5, r4 NOTE: the move macro instruction is architecture dependent. For mipsl and mipsb processors, 32-bit macro definition is used. For other processors, 64-bit macro definition is used. If this option is on, IDA will try to combine several instructions into a macro instruction. For example, lui r5, 1 ori r5, 0xA5A5 will be replaced by li r5, 0x1A5A5 This option requires the previous option to be turned on. When looking back for the 'lui' instruction, stop when an xrefed instruction is found. Allow hidden modification of $1 in macros.