Unjustified warning?

[Marcel Keller]

Hi,

Compiling the attached code with GCC 7.2 (Ubuntu 17.10) gives the 
following warning:

$ g++ -mavx -O3 foo.cpp -c
In function ‘void foo(size_t)’:
cc1plus: warning: ‘void* __builtin_memset(void*, int, long unsigned 
int)’: writing between 32 and 18446744073709551584 bytes into a region 
of size 16 overflows the destination [-Wstringop-overflow=]

However, the length in the memset call would be between 1 and 31, and 
the range 1 to 16 should be fine, as far as I can tell. Should that be 
considered a bug?

Best regards,
Marcel
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