Interactive Demo

Double-double arithmetic on f32 pairs — ~48-bit precision from WebAssembly.

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1 · Word decomposition

Every value is hi + lo, two f32 words. Type a number and watch it split.







  
2 · Cancellation: harmonic sum

  
Hn = Σ 1/k is the classic cancellation case. f32 loses digits; df64 tracks the true answer.

  

    
    
  

  

    
accumulatorHnerror vs f64

    
plain f32——

    
df64——

  






  
3 · Conjugate gradient (Poisson)

  
Double-double CG on a tridiagonal 1-D Poisson problem.

  

    
    
  

  






  
4 · Throughput: GEMM

  
Matrix multiply measured inside the WASM binary (time on JS side).

  

    
    
  

  






  
5 · WGSL kernels

  
Raw shader sources for a future WebGPU backend.