Posts tagged #jit
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Fusing a risp pipeline to beat CPython: killing 400,000 allocations wasn't enough
In risp, a zero-dependency Rust Lisp, fusing map/filter/fold cuts 400,000 allocations to O(1) — but only a monomorphized i64 loop beats CPython: 4 ms vs 24 ms.
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Why risp, a native-compiling Lisp, loses to CPython on map/fold: allocation, not codegen
risp, a zero-dependency Rust Lisp, beats CPython by 9–40× on integers but loses 3× on map+fold — the bottleneck is ~400,000 cons-cell allocations, not dispatch.
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Adding a Cranelift JIT that runs 10–23× faster than CPython
A deep dive into risp's opt-in Cranelift JIT in Rust: a decline-don't-guess type checker, lowering if/cond/let to Cranelift IR, inline signed-overflow detection, tail-calls as loop back-edges, and a deopt guard — beating CPython by 10× to 42×.