// This microbenchmarks validates that the fix in https://webkit.org/b/170961 // does not regress the performance gains from r211670: . // r211670 reduces the size of operationToInt32SensibleSlow() for handling double numbers with // binary exponent 31. Hence, this microbenchmark stresses doubleToIn32 conversion on // numbers with binary exponents in the vicinity of 31. let doubleValues = [ 2.147483648e8, // exp = 27 2.147483648e9, // exp = 31 2.147483648e10, // exp = 34 ]; function test(q, r, s, t, u, v, w, x, y, z) { // Do a lot of double to int32 conversions to weigh more on the conversion. return q|0 + r|0 + s|0 + t|0 + u|0 + v|0 + w|0 + x|0 + y|0 + z|0; } noInline(test); var result = 0; let length = doubleValues.length; for (var i = 0; i < 1000000; ++i) { for (var j = 0; j < length; j++) { var value = doubleValues[j]; result |= test(value, value, value, value, value, value, value, value, value, value); } } if (result != -1932735284) { throw "Bad result: " + result; }