Various optimization questions
First of all, I'm using GCC. So all the questions I'm asking are GCC specific. Please don't complain that you can't ++ with bools, because GCC has that extension.
1. How many bits (read, sizeof() is useless here) does a bool take up?
2. Will x'oring a number with itself or setting it to zero be faster?
3. With bool types, will "++" or "= 1" work faster? Or, is there an even quicker way to set a bool to TRUE?
if (imn == 4)
imn = 2;
else imn = 4;
run faster? Thanks.
imn -= 2;
imn = !imn;
imn = 2 * imn + 2;