On 23.11.2015 17:43, Yann Ylavic wrote:
> with attachment...
There is a mistake somewhere in the optimized version:

    ./o 1 100000000 aaaa aa1a 0
    Optimized (nb=100000000, len=0)
    time = 0.611311 : res = 0

The result should not be zero. Indeed, the string.h version is correct:

    ./o 0 100000000 aaaa aa1a 0
    <string.h> (nb=100000000, len=0)
    time = 4.189366 : res = 48

Yours,

    -mi

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