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x86 - How Do You Make An Assembler? - Stack Overflow
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.

terminology - "Assembly" vs. "Assembler" - Stack Overflow
Assembler. This is a tool like MASM\FASM used for compiling source code into machine code. Assembler Language. This is the language used by any given assembler. I view this as being different from assembly language because assemblers can add their own syntactic sugar which does not exist in the underlying assembly language.

What is the best way to go about writing a simple x86 assembler?
The default can be either short or long depending on taste or even an assembler option. A small bit of syntax entered by the coder saying "use the other kind" or "I insist on this kind" suffices (e.g., "JMP long target") to handle those case where the assembler's default choice is wrong. (This is assembler, its OK to have funky rules).

ARM IT conditional instruction assembler (armcc)
The instructions are encoded with the conditions. For the Thumb2, it primes the condition registers to setup the condition bits. There are three modes of ARM assembler; .arm, .thumb and .unified. Also .code 32 and .code 16. Depending on the mode in use and the particular assembler (Gnu, ARM, etc) you will get different warnings and/or errors.

How do I start learning Assembly - Stack Overflow
Write simple programs in C and then compile them with the -S switch. you will get a file.s containing the assembler code. Tinker with it and you will learn it. The best part is that if you want to learn a different assembler, you can just compile gcc as cross compiler, and produce assembler for any supported platform.

x86 64 - How to write a X86_64 _assembler_? - Stack Overflow
An assembler, like any other "compiler", is best written as a lexical analyser feeding into a language grammar processor. Assembly language is usually easier than the regular compiled languages since you don't need to worry about constructs crossing line boundaries and the format is usually fixed.

x86 - What does ORG Assembly Instruction do? - Stack Overflow
ORG is used to set the assembler location counter. This may or may not translate to a load address at link time. It can be used to define absolute addresses, e.g. when defining something like interrupt vectors which may need to be at a fixed address, or it can be used to introduce padding or generate a specific alignment for the following code.

How do you get assembler output from C/C++ source in GCC?
The OP was about getting the assembler output equivalent of the C/C++ source code, this gets the Listing, which I agree is more useful for understanding what the compiler and optimizer is doing. But it would cause the assembler itself to barf, as it is not expecting the line numbers, and compiled bytes off tot he left of the assembly instructions.

c++ - Compile errors with Assembler messages - Stack Overflow
The problem is the assembler being too old to assemble the instructions gcc is emitting. If your CPU supports FMA, gcc -march=native or gcc -march=haswell will emit FMA instructions. Using a lower -march setting that doesn't use FMA instructions (or -mno-fma ) will cost you run-time performance, but that's not even what this answer is suggesting.

x86 - MUL function in assembly - Stack Overflow
This can be done at build time, either using a calculator and hard-coding the value, or writing out the multiplication of the constants symbolically and letting your assembler do the computation. That is, mov ax, 50. Or let your assembler do it for you with mov ax, 5 * 10. But like I said, I'm sure you knew this already!