spectral-norm Dart jit program

source code

```// The Computer Language Benchmarks Game
// https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
//
// contributed by Jos Hirth
// based on the JavaScript version by Ian Osgood with modifications by Isaac Gouy

import 'dart:math' as math;
import 'dart:typed_data';

double A(int i, int j) {
int div = ((i + j) * (i + j + 1) >> 1) + i + 1;
return 1.0 / div;
}

void Au(Float64List u, Float64List w) {
int len = u.length;
for (int i = 0; i < len; ++i) {
double t = 0.0;
for (int j = 0; j < len; ++j) {
t += A(i, j) * u[j];
}
w[i] = t;
}
}

void Atu(Float64List w, Float64List v) {
int len = w.length;
for (int i = 0; i < len; ++i) {
double t = 0.0;
for (int j = 0; j < len; ++j) {
t += A(j, i) * w[j];
}
v[i] = t;
}
}

void AtAu(Float64List u, Float64List v, Float64List w) {
Au(u, w);
Atu(w, v);
}

double spectralNorm(n) {
var u = new Float64List(n)..fillRange(0, n, 1.0),
v = new Float64List(n),
w = new Float64List(n),
vv = 0.0,
vBv = 0.0;

for (int i = 0; i < 10; ++i) {
AtAu(u, v, w);
AtAu(v, u, w);
}
for (int i = 0; i < n; ++i) {
vBv += u[i] * v[i];
vv += v[i] * v[i];
}
return math.sqrt(vBv / vv);
}

void main(args) {
int n = args.length > 0 ? int.parse(args[0]) : 100;
print(spectralNorm(n).toStringAsFixed(9));
}
```

notes, command-line, and program output

```NOTES:
Dart SDK version: 3.4.1 (stable)
Tue May 21 15:46:25 2024

Wed, 29 May 2024 00:06:49 GMT

MAKE:
/opt/src/dart-sdk/bin/dart analyze
Analyzing tmp...
No issues found!

3.05s to complete and log all make actions

COMMAND LINE:
/opt/src/dart-sdk/bin/dart run  spectralnorm.dartjit 5500

PROGRAM OUTPUT:
1.274224153
```