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Diffusion Ant (master) Code

ant/tests/repro_nan3.js
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repro_nan3.js
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// Isolate: does the NaN come from the return expression or from sum corruption?
// Test A: upvalue capture, return constant (no sum, no n)
function test_const(n) {
function f(a) { sum++; }
var j, sum;
sum = 0;
for (j = 0; j < n; j++) { f(j); }
return 42;
}
// Test B: upvalue capture, return n (param read)
function test_n(n) {
function f(a) { sum++; }
var j, sum;
sum = 0;
for (j = 0; j < n; j++) { f(j); }
return n;
}
// Test C: upvalue capture, return n * 4
function test_nmul(n) {
function f(a) { sum++; }
var j, sum;
sum = 0;
for (j = 0; j < n; j++) { f(j); }
return n * 4;
}
// Test D: upvalue capture, return sum
function test_sum(n) {
function f(a) { sum++; }
var j, sum;
sum = 0;
for (j = 0; j < n; j++) { f(j); }
return sum;
}
// Test E: upvalue capture but no call to f in loop, return n * 4
function test_nocall(n) {
function f(a) { sum++; }
var j, sum;
sum = 0;
for (j = 0; j < n; j++) { sum = sum + 1; }
return n * 4;
}
var tests = [
["const", test_const, function(n) { return 42; }],
["n", test_n, function(n) { return n; }],
["n*4", test_nmul, function(n) { return n * 4; }],
["sum", test_sum, function(n) { return n; }],
["nocall", test_nocall, function(n) { return n * 4; }],
];
for (var t = 0; t < tests.length; t++) {
var name = tests[t][0], fn = tests[t][1], expect = tests[t][2];
var fails = 0;
for (var i = 0; i < 40; i++) {
var n = (i < 5) ? (i + 1) : (i * 200);
var result = fn(n);
var exp = expect(n);
if (result !== exp) {
if (fails < 3)
console.log("FAIL " + name + "(" + n + ") = " + result + ", expected " + exp);
fails++;
}
}
if (fails > 0) console.log(" " + name + ": " + fails + " failures");
else console.log(" " + name + ": PASS");
}

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