instruction address การใช้

• In supervisor mode, instruction addresses correspond directly to physical memory.
• Memory barrier instructions address reordering effects only at the hardware level.
• When that occurs ( the STL's next instruction address remains 0003 ) execution continues as follows:
• To allow software bugs to be caught, all invalid instruction addresses read as zero, which is a trap instruction.
• The effective address for a PC-relative instruction address is the offset parameter added to the address of the next instruction.
• Later machines would use more complicated and accurate algorithms ( branch prediction and branch target prediction ) to guess the next instruction address.
• This was achieved by using map tables held in fast parity checked RAM which mapped one byte opcodes onto micro-instruction addresses.
• Maximum memory is limited by the length of the instruction address field of 17 bits, or 128K Words ( 512K Bytes ).
• Also, a Harvard architecture machine has distinct code and data address spaces : instruction address zero is not the same as data address zero.
• Note that when the flash size is over 64K words ( 128 KBytes ), instruction addresses can no longer be encoded in just two bytes.
• A Change Sequence Mode ( CSM ) instruction stored the next instruction address in a memory location and loaded the instruction counter from another memory location.
• The predictor table is indexed with the instruction address bits, so that the processor can fetch a prediction for every instruction before the instruction is decoded.
• Binary hardening often involves the non-deterministic modification of control flow and instruction addresses so as to prevent attackers from successfully reusing program code to perform exploits.
• Instruction address zero might identify a twenty-four bit value, while data address zero might indicate an eight-bit byte that is not part of that twenty-four bit value.
• In the case of reading a load card, the " next instruction address " is taken from the data address field, not the next instruction address field ( shown above as xxxx ).
• In the case of reading a load card, the " next instruction address " is taken from the data address field, not the next instruction address field ( shown above as xxxx ).
• Each register contains a 5-bit value ( R n ) which is prepended to the low-order 11 bits of the instruction address field to form the 16-bit physical address.
• The Index registers operate using two's complement format and when used to modify an instruction address are " "'subtracted " "'from the address in the instruction.
• He atomizes Melzak's single 3-parameter operation ( really 4 if we count the instruction addresses ) into a 2-parameter increment " X + " and 3-parameter decrement " X-".
• The OUT instruction also increments the X register, which is R0, which is also the PC, so it outputs the immediate value after the OUT and continues program execution at the next instruction address after the immediate value.