constant-evaluation-nan.js

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// |jit-test| --canonicalize-nan-at-uses=on

load(libdir + "nans.js");

testWithFloatTypedArrays((FloatArray, UintArray, NaNs) => {

  var f = new FloatArray(2);

  var u = new UintArray(f.buffer);

  for (var i = 0; i < 100; ++i) {

    u[0] = NaNs[i % NaNs.length];

    // Float addition with a NaN constant. GVN will constant fold the result

    // to compile-time constant NaN.

    var x = f[0] + NaN;

    // Never a tainted value, except when GVN is disabled.

    f[1] = x;

    assertEq(f[1], NaN);

    assertEq(x, NaN);

});