qvariant autotest fails in 'void tst_QVariant::numericalConvert()' (memory corruption?)

When running qvariant autotest in ARM environment it fails in 'void tst_QVariant::numericalConvert()':

When 'i' reaches 3 then 'num' should be set to 5 but it doesn't, causing comparisons to fail.

--------------------------------
for(int i = 0; i < vect.size(); i++) {
double num = 5.3;
if (i >= 3 && i <= 7)
num = 5;

QVariant *v = vect.at;
QCOMPARE(v->toFloat() , float(num));
---------------------------------

If I change

if (i >= 3 && i <= 7)
num = 5;

to

if (i >= 3)
if (i <= 7)
num = 5;

or comment out QCOMPARE lines then 'num' is set to 5 correctly.