HackersDelight | Code from the book Hacker 's Delight '' by Henry S | Learning library

by aistrate C Version: Current License: No License

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kandi X-RAY | HackersDelight Summary

HackersDelight is a C library typically used in Tutorial, Learning applications. HackersDelight has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Code from the book "Hacker's Delight" by Henry S. Warren, Jr. (original and my own modifications).

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HackersDelight has a low active ecosystem.

It has 15 star(s) with 5 fork(s). There are 3 watchers for this library.

It had no major release in the last 6 months.

HackersDelight has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of HackersDelight is current.

Quality

HackersDelight has 0 bugs and 0 code smells.

Security

HackersDelight has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

HackersDelight code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

HackersDelight does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

HackersDelight releases are not available. You will need to build from source code and install.

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HackersDelight Key Features

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HackersDelight Examples and Code Snippets

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Community Discussions

Trending Discussions on HackersDelight

Utilizing CLMUL in SICStus Prolog

Fast integer division in Java

QUESTION

Utilizing CLMUL in SICStus Prolog

Asked 2019-Sep-30 at 10:19

How can I get the SICStus Prolog JIT to use any of the following ISA?

Intel BMI: POPCNT, LZCNT, TZCNT, PDEP, PEXT
Intel CLMUL: PCLMULQDQ
ARM AArch64: RBIT

I need them for supercharging clpz. Right now, I got:

http://www.hackersdelight.org/ and
the non-ISO arithmetic function msb/1.

For a start that's good, but I want more. Please help!

...

ANSWER

Answered 2019-Sep-30 at 10:19

Unfortunately, there is no way for users to extend the JIT for cases like this.

I have been thinking about accessing the population count instructions (for some unrelated uses) from Prolog. The way to add this and other similar instructions would be:

Add a new arithmetic instruction to is/2. This needs to be supported by all our code, not just JIT-compiled code, so interpreter, WAM-emulator, various internal byte-code-processors, all the static analyzers in our IDE, etc. etc.
Add JIT-compilation that just calls back into the corresponding C routine in the runtime system.
If it can be demonstrated to benefit performance sufficiently, make the JIT compiler emit the special purpose CPU instructions for targets that have them.

(1) requires sufficient user demand (or explicit financing, of course). (3) requires convincing benchmarks. Currently neither of these are available, but that could change, of course.

Source https://stackoverflow.com/questions/58134018

QUESTION

Fast integer division in Java

Asked 2017-Mar-16 at 20:55

It is well known that integer division is slow operation (typically several times slower than integer multiplication). But, if one need to perform many divide operations with a fixed divisor, it is possible to do some preconditioning on the divisor and replace "/" with multiplication and bit operations (Chapter 10 in Hacker's Delight).

As I've tested, if the divisor is a compilation-time constant, (e.g. static final long DIVISOR = 12345L;) JVM will do the trick and replace all divisions by DIVISOR with multiplication and bit operations. I'm interesting in the same kind of trick but when the divisor is known only at runtime.

For example, the following (slow) method:

...

ANSWER

Answered 2017-Mar-16 at 20:53

There is well known C/C++ libdivide library for fast integer division, and there is my adaptation of this library for Java libdivide4j.

Fast division with libdivide4j looks as follows:

Source https://stackoverflow.com/questions/42840754

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install HackersDelight

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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