Is it worthwile to learn assembly language? - Stack Overflow
A different assembly language for each family of processors. 386 code runs on any later x86 processor including Intel and AMD's offerings -- but some feature sets are proprietry extensions. The language is the same for these extra instructions but the resulting binary won't be portable. –
What does the 'and' instruction do to the operands in assembly …
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.
Just finished learning x86 assembly language. What can I do with it ...
2014年1月29日 · If you're already a developer in a higher-level programming language, assembly language allows you to create optimized routines/functions. I don't know about the others, but Delphi, for instance, allows you to perfectly integrate assembly code into any unit, and takes care of the function parameters etc.
What do the dollar ($) and percentage (%) signs represent in x86 …
2018年9月28日 · I am trying to understand how the assembly language works for a micro-computer architecture class, and I keep facing different syntaxes in examples: sub $48, %esp mov %eax, 32(%esp) What do these codes mean? …
Assembly difference between [var], and var - Stack Overflow
2017年3月2日 · in assembly, it's equivalent to *variable in C. That is, treat variable as a pointer and dereference that pointer — get the value the the pointer is pointing to. Similarly, the 'type identifiers' are like casting the pointer to a different type:
What does the dollar sign ($) mean in x86 assembly when …
2012年4月28日 · NASM supports two special tokens in expressions, allowing calculations to involve the current assembly position: the $ and $$ tokens. $ evaluates to the assembly position at the beginning of the line containing the expression; so you can code an infinite loop using JMP $.
Assembly code vs Machine code vs Object code? - Stack Overflow
2009年1月21日 · "An assembly language is a low-level language for programming computers. It implements a symbolic representation of the numeric machine codes and other constants needed to program a particular CPU architecture." Machine code is discussed here.
assembly - What's the purpose of the LEA instruction ... - Stack …
2009年11月1日 · The Intel Optimization manual says fast path LEA is single cycle and slow path LEA takes three cycles. Moreover, on Skylake there are two fast path functional units (ports 1 and 5) and there's only one slow path functional unit (port 1). Assembly/Compiler Coding Rule 33 in the manual even warns against using 3 operand LEA. –
What does bx lr do in ARM assembly language? - Stack Overflow
2014年11月23日 · @user2177940 Part 1: Mode Switch. An ARMv7 CPU operates in one of two modes (Called ARM or Thumb), that differ in the instruction encoding (chiefly in "complete" but large 4-byte instructions vs. "restricted" but small 2-byte instructions).
x86 - Assembly - JG/JNLE/JL/JNGE after CMP - Stack Overflow
2012年3月8日 · I don't understand the JG/JNLE/JL/JNGE instructions, which come after CMP. for example, If I have: CMP al,dl jg label1 When al=101; dl =200.