Why aren't programs written in Assembly more often? [closed]
HellŠ¾, I am a compiler.
I just scanned thousands of lines of code while you were reading this sentence. I browsed through millions of possibilities of optimizing a single line of yours using hundreds of different optimization techniques based on a vast amount of academic research that you would spend years getting at. I won't feel any embarrassment, not even a slight ick, when I convert a three-line loop to thousands of instructions just to make it faster. I have no shame to go to great lengths of optimization or to do the dirtiest tricks. And if you don't want me to, maybe for a day or two, I'll behave and do it the way you like. I can transform the methods I'm using whenever you want, without even changing a single line of your code. I can even show you how your code would look in assembly, on different processor architectures and different operating systems and in different assembly conventions if you'd like. Yes, all in seconds. Because, you know, I can; and you know, you can't.
P.S. Oh, by the way you weren't using half of the code you wrote. I did you a favor and threw it away.
ASM has poor legibility and isn't really maintainable compared to higher-level languages.
Also, there are many fewer ASM developers than for other more popular languages, such as C.
Furthermore, if you use a higher-level language and new ASM instructions become available (SSE for example), you just need to update your compiler and your old code can easily make use of the new instructions.
What if the next CPU has twice as many registers?
The converse of this question would be: What functionality do compilers provide?
I doubt you can/want to/should optimize your ASM better than gcc -O3 can.
I've written shedloads of assembler for the 6502, Z80, 6809 and 8086 chips. I stopped doing so as soon as C compilers became available for the platforms I was addressing, and immediately became at least 10x more productive. Most good programmers use the tools they use for rational reasons.