private strictfp double trueLog2(double d) {
double trueLog2 = StrictMath.log(d) / StrictMath.log(2);
// increment until it's >= the true value
while (StrictMath.pow(2.0, trueLog2) < d) {
trueLog2 = StrictMath.nextUp(trueLog2);
}
// decrement until it's <= the true value
while (StrictMath.pow(2.0, trueLog2) > d) {
trueLog2 = StrictMath.nextAfter(trueLog2, Double.NEGATIVE_INFINITY);
}
if (StrictMath.abs(StrictMath.pow(2.0, trueLog2) - d)
> StrictMath.abs(StrictMath.pow(2.0, StrictMath.nextUp(trueLog2)) - d)) {
trueLog2 = StrictMath.nextUp(trueLog2);
}
return trueLog2;
}
