Re: Re: PHP on 64bit Ubuntu

Yes and No. PHP could be storing bools as a bit packed in a long word. But your point about compiling is sill more valid. Compiling 32bit instructions may use instructions that offer off-alignment memory referencing. That is -- a bool may actual take only a byte in a 32bit system. That instruction may not be available in 64bit mode. Thus that bool taking a whole long word. 8x the space, not twice. Let's write some assembly! On Wed, Sep 3, 2008 at 11:41 PM, Robert Cummings <robert@interjinn.com> wrote: > On Wed, 2008-09-03 at 23:39 -0700, steve wrote: >> > A word boundary usually matches the natural integer size for the >> > processor. In the case of a 32 bit processor it would be 32 bits, in the >> > case of a 64 bit processor it would be 64 bits. This may or may not hold >> > for windows, but more than likely the word size doubles between the 32 >> > bit architecture and the 64 bit architecture. As such due to alignment >> > we would still see only a maximal doubling of space. Fringe cases may >> > exist to satisfy your argument, but I doubt PHP falls into this >> > category... especially as relates to a packaged binary or default >> > configure. >> >> I didn't mean for the PHP binary itself, but the PHP code written in >> PHP that is parsed: >> >> $test = true; > > But the PHP binary is what allocates the memory. It all comes down to > how the PHP binary was compiled. > > Cheers, > Rob. > -- > http://www.interjinn.com > Application and Templating Framework for PHP > >