Unsynchronized int access from threads

[claptrap]

On Thursday, 18 June 2020 at 16:42:15 UTC, H. S. Teoh wrote:
> Suppose I have an int[] which may contain some zeroes, and 2 
> functions, one scans the array for zeroes but does not modify 
> it, and the other modifies array elements but never introduces 
> new zeroes (though it may write a 0 to an existing 0).  Is it 
> thread-safe to run the two functions in parallel without any 
> synchronization between them?
>

Found the relevant doc

http://www.cs.cmu.edu/~410-f10/doc/Intel_Reordering_318147.pdf