On Tue, Jan 22, 2008 at 06:03:56PM -0800, [EMAIL PROTECTED] wrote:
On Tue, Jan 22, 2008 at 03:24:01PM -0800, SJS wrote:
When did x86 and ARM CPUs get a stack on the CPU?
The assembly includes instructions for a stack. I don't know details of where
or how the stack is implemented.
ARM doesn't have stack instructions, you just think it does :-)
The load-multiple and store-multiple instructions have bits indicating
pre/post increment/decrement (yes, all for possitilities), and another bit
that indicates whether the adjusted offset should be written back to the
register. You can use it like a stack, but you can use it for a lot of
other things.
Calling conventions on ARM use a certain register as a stack pointer, but
there isn't anything special about that register.
x86 does have special instructions that implicitly use the stack-pointer
register, but it is still just an indexing addressing mode. It is very
different than a stack-based process.
In a stack process, you don't have any registers, just the stack. Ok, you
might get an accumulator.
Dave
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