Top "Machine-instruction" questions

How was the first compiler written?

I heard about the chicken and the egg and bootstrapping. I have a few questions. What wrote the first compiler …

compiler-construction machine-instruction
ADC instruction in ASM 8086

When I use ADC for exmaple: AL = 01 and BL = 02, and CF = 1 when I make this: ADC AL,BL Will AL …

assembly x86-16 machine-instruction
What's the purpose of the rotate instructions (ROL, RCL on x86)?

I always wondered what's the purpose of the rotate instructions some CPUs have (ROL, RCL on x86, for example). What …

assembly x86 cpu-architecture machine-instruction
Processor Instruction Cycle Execution Time

My guess is that the __no_operation() intrinsic (ARM) instruction should take 1/(168 MHz) to execute, provided that each NOP executes …

execution-time stm32 cortex-m machine-instruction nop
Is syscall an instruction on x86_64?

I wanted to check the code for performing system calls in glibc. I found something like this. ENTRY (syscall) movq %…

c linux gcc x86-64 machine-instruction
Difference between long and short jump (x86)

I've read that short jumps are to be used when the relative jump is less than 124 in address, and long …

assembly x86 cpu instructions machine-instruction
Dynamic vs Static instruction count

What is the difference between dynamic and static instruction count? a. Derive an expression to calculate the user CPU time …

mips instructions machine-instruction
What does actual machine code look like at various points?

There seems to be many opinions on what machine code actually is. I've heard some say it's assembly, or binary, …

assembly hex machine-code machine-instruction