tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

round-float32.js (1918B)

      1 // Bug 1073910
      2 (function() {
      3    function roundf(y) {
      4        return Math.round(Math.fround(y));
      5    }
      6 
      7    var x = -1;
      8    assertEq(roundf(x), x);
      9    assertEq(roundf(x), x);
     10 
     11    var x = -2;
     12    assertEq(roundf(x), x);
     13    assertEq(roundf(x), x);
     14 
     15    var x = -1024;
     16    assertEq(roundf(x), x);
     17 
     18    var x = -14680050;
     19    assertEq(roundf(x), Math.fround(x));
     20 
     21    var x = -8388610;
     22    assertEq(roundf(x), Math.fround(x));
     23 })();
     24 
     25 // Bug 1000606
     26 (function() {
     27    function f() {
     28        var d = Math.fround(0.4999999701976776);
     29        return Math.round(d);
     30    }
     31    assertEq(f(), f());
     32 
     33    function g() {
     34        var c = Math.fround(8886111);
     35        return Math.round(c);
     36    }
     37    assertEq(g(), g());
     38 })();
     39 
     40 // Bug 1124485
     41 (function() {
     42    function h(x) {
     43        var y = Math.fround(x);
     44        assertEq(y, Math.pow(y, 1));
     45    }
     46    h(0);
     47    h(2147483647);
     48 })();
     49 
     50 // Bug 1122344
     51 (function() {
     52    function f() {
     53        return Math.round(Math.fround(-13527757));
     54    };
     55    assertEq(f(), f());
     56 })();
     57 
     58 (function() {
     59    // Test values around -0.5 and +0.5
     60    var f32 = new Float32Array(1);
     61    var i32 = new Int32Array(f32.buffer);
     62 
     63    function round(x) { return Math.round(x); }
     64    function roundf(x) { return Math.round(Math.fround(x)); }
     65 
     66    // Warm up
     67    round(2.5);
     68    round(3.5);
     69    roundf(2.5);
     70    roundf(3.5);
     71 
     72    f32[0] = 0.5;
     73    i32[0] += 1;
     74    print('0.5+e =', f32[0]);
     75 
     76    var x = f32[0];
     77    assertEq(round(x), 1);
     78    assertEq(roundf(x), 1);
     79 
     80    f32[0] = 0.5;
     81    i32[0] -= 1;
     82    print('0.5-e =', f32[0]);
     83 
     84    var x = f32[0];
     85    assertEq(round(x), 0);
     86    assertEq(roundf(x), 0);
     87 
     88    f32[0] = -0.5;
     89    i32[0] += 1;
     90    print('-0.5-e =', f32[0]);
     91 
     92    var x = f32[0];
     93    assertEq(round(x), -1);
     94    assertEq(roundf(x), -1);
     95 
     96    f32[0] = -0.5;
     97    i32[0] -= 1;
     98    print('-0.5+e =', f32[0]);
     99 
    100    var x = f32[0];
    101    assertEq(round(x), -0);
    102    assertEq(roundf(x), -0);
    103 })();