Why set zero in zero.c rather than use xor_n

[Vincent Lefevre]

On 2018-02-05 21:48:47 +0100, Torbjorn Granlund wrote:
> I suppose memset is not used as it might come with more overhead for
> checking alignment.  I haven't timed it, though.

The compiler knows the alignment from the types. This is where the
optimization should be. The GCC manual mentions a __builtin_memset
builtin, though I don't know what it does exactly.

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