tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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unroll4.js (1016B)

      1 // |jit-test| test-also=--setpref=wasm_unroll_loops=true
      2 
      3 // Loop unrolling test: 2 exiting values, 1 exit target => can be unrolled.
      4 // `a` and `b` are swapped every iteration and correct unrolling depends on
      5 // the phi nodes being treated as parallel assignments.
      6 
      7 let t = `
      8 (module
      9  (func (export "f1") (param $limit i32) (result i64)
     10    (local $a i64)
     11    (local $b i64)
     12    (local $tmp i64)
     13    (local $x i32)
     14    (local.set $a (i64.const 12345))
     15    (local.set $b (i64.const 67890))
     16    (loop $cont
     17       ;; swap a and b
     18       (local.set $tmp (local.get $a))
     19       (local.set $a (local.get $b))
     20       (local.set $b (local.get $tmp))
     21       ;; x = x + 1
     22       (local.set $x (i32.add (local.get $x) (i32.const 1)))
     23       ;;
     24       (br_if $cont (i32.lt_u (local.get $x) (local.get $limit)))
     25    )
     26    (i64.sub (local.get $a) (local.get $b))
     27  )
     28 )`;
     29 
     30 let i = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary(t)));
     31 
     32 assertEq(i.exports.f1(100), -55545n);
     33 assertEq(i.exports.f1(101), 55545n);