Antti Haapala added the comment:
There is no need to ifdef anything, the memcpy is the only correct way to do
it. As memcpy is also a reserved identifier in C, the compiler can and will
optimize this into a 64-bit access on those platforms where it can be safely
done so (x86 for example), e.g. GCC compiles
uint64_t func(char *buf) {
uint64_t rv;
memcpy(&rv, buf+3, sizeof(rv));
return rv;
}
into
movq 3(%rdi), %rax
ret
On Linux 64-bit ABI.
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nosy: +ztane
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<http://bugs.python.org/issue28055>
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