2017年4月26日 · Here is a link to a complete (I think) list of NASM instructions, which I presume also covers the x64 bit instruction set for Intel processors. However, I was hoping there would be a complete list of instructions somewhere, and just that, without the …

2018年12月4日 · The instruction and performs bit-wise AND operation on its operands. For example the instruction and al, bl should compute the AND operation on the register al and bl (as illustrated by @Serkratos121) and store the result in al register.

The IN instruction reads from an I/O device, OUT writes. When you use the IN or OUT instructions, the M/#IO is not asserted (held low), so memory doesn't respond and the I/O chip does. For the memory-oriented instructions, M/#IO is asserted so CPU talks to the RAM, and IO devices stay out of the communication.

2009年3月28日 · @PeterCordes It is intended to be covered by "certain instructions compete for the same execution units within the CPU", which uses "execution unit" to broadly cover all the capacity/specialization restrictions on scheduling such as ports, ALU/EUs, (those two being mostly interchangeable on recent archs), instruction-specific restrictions (lea for example).

2020年11月30日 · These are called instructions, and they specify operations that are to be performed by the processor. mov is a mnemonic for move, while mul is a mnemonic for multiply. Other common instructions include add, sub, and div. I trust you can figure out what operation these specify! Most instructions take two parameters.

SSE2 integer / double-precision instructions generally have 3-byte opcodes (66 0F xx or similar) SSSE3/SSE4.x instructions have 4-byte opcodes (3 mandatory prefixes) VEX-coded instructions can use a 2-byte VEX prefix if the SSE version is SSE3 or earlier, and the 2nd source register isn't a "high" register (xmm/ymm8-15). The XMM and YMM ...

2009年9月10日 · When you define instructions that read IP, you then have to define exactly what the IP's value will be when every one of those instructions is executed (the first opcode byte? the first byte of next instruction? Something in between, in a more complex instruction?) and then be prepared to live with that definition forever, for future compatibilty.

2012年12月5日 · In Google you can just write the name of the instruction, in this case test, and something like intel instruction (for Intel instructions): Google: test intel instruction From the results of the Google search linked above you'll also find out that some servers have separate pages for different x86 assembly instructions named according to the ...

2009年11月1日 · "This is a general rule in assembly programming: Use the instructions however it rocks your boat." I wouldn't personally hand that advice out, on account of things like call lbl lbl: pop rax technically "working" as a way to get the value of rip, but you'll make branch prediction very unhappy. Use the instructions however you want, but don't be ...

2017年6月14日 · I'm doing some assembly-level debugging in GDB. Is there a way to get GDB to show me the current assembly instruction in the same way that it shows the current source line? The default output after every command looks like this: 0x0001433f 990 Foo::bar(p);