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12. The assembly is a piece of code/executable that is in machine executable code. This might be an obj, exe, dll, ... It is the result of a compile. The assembler is the "compiler" that compiles code into machine executable code. This code has been written in the language " Assembly Language ". Assembly language in common English is often ...
The assembler understands only three different assembler codes "mov eax,immed32", "add eax,immed32", "and eax,immed32" and no data nor labels. It will produce a tiny Windows PE executable which outputs eax in hex at the end. Attention: In my case avira free antivirus doesn't like the output. It's a false positive.
For-loops: For-loop in C: //Do something! The same loop in 8086 assembler: xor cx,cx ; cx-register is the counter, set to 0. inc cx ; Increment. cmp cx,3 ; Compare cx to the limit. jle loop1 ; Loop while less or equal. That is the loop if you need to access your index (cx).
Assembly language is a more human readable view of machine language. Instead of representing the machine language as numbers, the instructions and registers are given names (typically abbreviated words, or mnemonics, eg ld means "load"). Unlike a high level language, assembler is very close to the machine language.
DIV r32 divides a 64-bit number in EDX:EAX by a 32-bit operand (in any register or memory) and stores the quotient in EAX and the remainder in EDX. It faults on overflow of the quotient. Unsigned 32-bit example (works in any mode) div ebx ; Divides 1234 by 10. ; EDX = 4 = 1234 % 10 remainder.
Typical uses are device drivers, low-level embedded systems, and real-time systems. Assembly language is as close to the processor as you can get as a programmer so a well designed algorithm is blazing -- assembly is great for speed optimization. It's all about performance and efficiency.
This should be described in the documentation for any assembler that has an and instruction. It does a bit-wise Boolean "and" between two operands. In other words, corresponding bits (bit n in each operand) are anded, in the Boolean operation sense, giving bit n of the result. In Boolean logic, 1 and 1 = 1, but 0 and x (anything else) = 0.
Machine code is discussed here. "Machine code or machine language is a system of instructions and data executed directly by a computer's central processing unit." Basically, assembler code is the language and it is translated to object code (the native code that the CPU runs) by an assembler (analogous to a compiler).
6 Answers. Sorted by: 41. AMD and Intel processors (*) have a large set of instructions in common, so it is possible for a compiler or assembler to write binary code which runs "the same" on both. However, different processor families even from one manufacturer have their own sets of instructions, usually referred to as "extensions" or whatever ...
The assembler performs a more or less isomorphic translation (a one-to-one mapping) from mnemonic statements into machine instructions and data. This is in contrast with high-level languages, in which a single statement generally results in many machine instructions. Note that most high level language compilers compile first to assembly code ...