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AI Engineering
Lobsters·Jul 1·5 min read
Low-level Haskell: The cursed way to emulate inline assembly in Haskell/GHC
TL;DR
Haskell lacks direct support for inline assembly, limiting access to specialized CPU instructions. The author explores a method to emulate inline assembly in Haskell using foreign function interfaces to compute the product of two 64-bit integers, retrieving both high and low bits.
✦ Why It Matters
Engineers can now leverage low-level CPU instructions in Haskell, improving performance for specific applications.
Key Takeaways
- Explore foreign function interfaces in Haskell for low-level access.
- Utilize CPU-specific instructions to enhance performance.
- Consider integrating C code for complex computations.
- Optimize Haskell applications by retrieving high and low bits.
Full Summary
Modern CPUs offer specialized instructions for tasks like SIMD (Single Instruction, Multiple Data) and cryptography, which are accessible in languages like C and C++ through inline assembly. Haskell, however, does not provide a straightforward way to utilize these low-level features.
The author proposes a technique to call foreign functions in Haskell, allowing the computation of the product of two 64-bit integers while retrieving both the high and low 64 bits. This is achieved by interfacing with C code that performs the multiplication using CPU-specific instructions.
The method demonstrates that Haskell can effectively tap into advanced CPU capabilities, which can lead to performance improvements in computationally intensive applications. By enabling access to these instructions, Haskell developers can optimize their code for better efficiency and speed.