Double precision value computation errors on MediaTek processors

Question

I\'ve found that one of my application posted on the market produces weird results on some phones. Upon investigation it turns out there is an issue with one function which

Answer 1

The problem you are facing could possibly be related to the processor hardware. There are some notorious examples in computing history:
1994, Some Intel Pentium processors did have an error, producing floating point calculation errors(FDIV bug). This was only as of the 4th digit after the decimal point. Intel ultimately put in place a replacement program to swap the defective CPUs for good ones. The DEC VAX 11/785 (introduced 1984) had a design flaw in its (optional)floating point coprocessor. Due to a race condition in hardware, sometimes the floating point coprocessor returned an arbitrary value instead of the desired result on some machines. Digital Equipment Corporation put in place a program to replace the (5 large printed circuit boards) coprocessor at all customers with a hardware maintenance contract in place.

I'd suggest that you could try to do some more testing on a wider hardware base to better understand the problem. If the problem would be really be related to hardware, I'm guessing your best approach would be to find a way to work around the problem & document it for other developers.