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Multi-Stage Programming with Splice Variables

33 matt_d 4 6/27/2025, 11:45:03 PM tsung-ju.org ↗

Comments (4)

perihelions · 2h ago

How is this different from a syntactic macro?

burakemir · 1h ago

Two big differences:

  - it is typed, and

  - multi-stage programming can also describe runtime-code generation.

kldx · 3h ago

> For example, instead of a power function that uses a loop, you could generate specialized code like x * x * x * x * x directly. This eliminates runtime overhead and creates highly optimized code.

Could anyone explain to me how this is different from templates or parameter pack expansion in C++? I can see the constexpr-ness here is encoded in the type system and appears more composable, but I am not sure if I am missing the point.

I looked at the paper but I can't find anything related to C++.

TimorousBestie · 5h ago

This is fascinating. I could see it being very useful for writing SIMD abstraction layers (like Highway or SIMDe) without so much of the cruft.