AVR IAR C Compiler

How to force the compiler to use stack as parameter passing for a
particular function (for recursive functions)?

Infact, my function isnt a recursive one, but has a big parameter list.
Due to this, the register values are being tampered, which were set by
other functions. SO, i want the compiler to use stack for this
particular function for its parameter calling.

Thanx in advance

Vidya <vidyaranya.c@trianz.com> wrote:

> Due to this, the register values are being tampered, which were set
> by other functions.

Hold it right there.  You're writing a C function.  If it wants to
take values from other functions, put them in the argument list, not
in registers.

C is not assembler, so don't pretend otherwise.  One of the
differences is that you *have to* give up control over the CPU
registers, and leave them to the C compiler to work with.

You're fighting the C compiler instead of using it.  Don't.

-- 
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.

"Vidya" <vidyaranya.c@trianz.com> wrote in message 
news:1123105189.153479.278310@f14g2000cwb.googlegroups.com...
> How to force the compiler to use stack as parameter passing for a
> particular function (for recursive functions)?
>
> Infact, my function isnt a recursive one, but has a big parameter list.
> Due to this, the register values are being tampered, which were set by
> other functions. SO, i want the compiler to use stack for this
> particular function for its parameter calling.

Big parameter list? Have you considered simply passing a pointer to a 
structure?

Steve
http://www.fivetrees.com

"Vidya" <vidyaranya.c@trianz.com> skrev i meddelandet 
news:1123105189.153479.278310@f14g2000cwb.googlegroups.com...
> How to force the compiler to use stack as parameter passing for a
> particular function (for recursive functions)?
>
> Infact, my function isnt a recursive one, but has a big parameter list.
> Due to this, the register values are being tampered, which were set by
> other functions. SO, i want the compiler to use stack for this
> particular function for its parameter calling.
>
> Thanx in advance
>

Why not push these registers in your function before use?

-- 
A. P. Richelieu