Hello,
I do not know if this is the right place to write, but please redirect
me if I should ask from some other place.
I wrote a code and compiled it with -O3. The interesting line is
following:
reg = (reg >> 8) ^ table[reg & 0xFF];
It produced:
mov edx, eax
movzx eax, al
shr dx, 8
xor dx, WORD PTR [ebx+eax*2]
I was wondering why there was that extra mov on the first line. So I
ended up to write it all as:
reg = table[reg & 0xFF] ^ (reg >> 8);
And it produced:
movzx edx, al
shr ax, 8
xor ax, WORD PTR [ebx+edx*2]
I do not know if this is a feature or bug but which ever it is, it would
be nice to know.
Risto Kivilahti
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