Assembler program in java

Improve Article. Save Article. Like Article. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Please use ide. Load Comments. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 9 years, 5 months ago. Active 3 years, 7 months ago. Viewed 27k times.

Improve this question. Peter Cordes k 41 41 gold badges silver badges bronze badges. If you're writing asm like that bit registers and using div by 4 instead of a shr al, 2 , it's definitely not going to be faster than what a C compiler could make for you.

ASM is only useful for performance if you know how to tune for the microarchitecture of current CPUs. This is a useful question, but the example is an example of why most people shouldn't use asm. You are right. Two things at the same time. I'd add something like an AVX dot product with proper order of instructions if I had enough experience at that time. You could edit the question to use something modern. Like maybe BMI2 pdep , which has no Java intrinsic. Ideally you could come up with something that you couldn't just as easily get a C compiler to emit for you, though.

I had Intel's opencl-c compiler create a branchless "vectorized clamp to Would you mind looking at it? Should I add full code or does it divert main idea of question to somewhere else? Show 7 more comments. Active Oldest Votes. Improve this answer. To be clear, the overhead is only "substantial" if you consider a few 10s of cycles substantial the typical overhead of a JNI call - for methods such as the above that operate over an array of reasonable size, the JNI overhead should disappear in the noise as long as data passing is done right, e.

Add a comment. Additional resources A more comprehensive walkthrough is available in this DZone article. Pyves Pyves 5, 7 7 gold badges 38 38 silver badges 56 56 bronze badges. Hmm, actually according to agner. PeterCordes Thanks for these insights, I have modified my answer accordingly.

I'll also go and modify the code on the repository, unless you're interested in submitting a pull request? Language Processors — Compilers, interpreters, translate programs written in high-level languages into machine code that a computer understands.

And assemblers translate programs written in low-level or assembly language into machine code. In the compilation process, there are several stages. To help programmers write error-free code, tools are available. Assembly language is machine-dependent, yet mnemonics used to represent instructions in it are not directly understandable by machine and high-Level language is machine-independent. A computer understands instructions in machine code, i. It is a tedious task to write a computer program directly in machine code.

These source code cannot be executed directly by the computer and must be converted into machine language to be executed. The language processors can be any of the following three types: 1. Compiler : The language processor that reads the complete source program written in high-level language as a whole in one go and translates it into an equivalent program in machine language is called a Compiler.