Re: [cc65] Optimizing code fails - Found the error!

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From: Groepaz (groepaz_at_gmx.net)
Date: 2003-11-22 21:29:55 

On Saturday 22 November 2003 21:13, Geoffrey Wossum wrote:

> For gcc on the AVR microcontrollers, there's an __interrupt__ attribute
> that is used for ISR's, which insures that proper prologue and epilogue
> code is generated.  When writing ISR's for avr-gcc, two macros are
> provided, INTERRUPT and SIGNAL.  They're virtually identical, except
> INTERRUPT re-enables global interrupts right after the prologue code. 
> There's also names for every possible interrupt vector, such as
> SIG_UART0_RECV, which translates to something like __vector11.  So to write
> an ISR in C using avr-gcc, you write:

[...]

i'd prefer a clean solution based on function attributes....since thats
a mechanism that could allow for some other nice features aswell (like
in gcc, alignment, "naked" functions without the c-ish pro/epilogue etc
- and ofcourse also irq handlers)..... the attribute thing could solve
other issues aswell, like explicitly placing certain variables or
functions into specific segments (__attribute__(("segment=myzeropage")) ...).

however, if i understood previous discussions correctly, cc65 doesnt have
that kinda attribute functionality yet even internally, so it might take
some effort to implement.

gpz

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