For H8/300 size_t is 32 bits wide, but (unsigned char)buf[2] << 16
promotes to int which is only 16 bits wide. The shift is then undefined.
This fixes it by converting to size_t before shifting.
libstdc++-v3/ChangeLog:
PR libstdc++/107885
* libsupc++/hash_bytes.cc (_Hash_bytes): Convert to size_t
instead of implicit integer promotion to 16 bits.
len -= 4;
}
+ size_t k;
// Handle the last few bytes of the input array.
switch(len)
{
case 3:
- hash ^= static_cast<unsigned char>(buf[2]) << 16;
+ k = static_cast<unsigned char>(buf[2]);
+ hash ^= k << 16;
[[gnu::fallthrough]];
case 2:
- hash ^= static_cast<unsigned char>(buf[1]) << 8;
+ k = static_cast<unsigned char>(buf[1]);
+ hash ^= k << 8;
[[gnu::fallthrough]];
case 1:
- hash ^= static_cast<unsigned char>(buf[0]);
+ k = static_cast<unsigned char>(buf[0]);
+ hash ^= k;
hash *= m;
};