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RE: [avr-gcc-list] GCC code gen on xmega

From: Weddington, Eric
Subject: RE: [avr-gcc-list] GCC code gen on xmega
Date: Mon, 16 Feb 2009 10:49:06 -0700


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of larry barello
> Sent: Monday, February 16, 2009 10:37 AM
> To: address@hidden
> Subject: [avr-gcc-list] GCC code gen on xmega
> What follows is a pretty typical sequence for a vararg function on the
> XMEGA.   In particular, why does the code generator do the 
> funky double
> "call" rather than just subtract the right number from the SP?   I am
> guessing this is a left-over code from the early XMEGA stack 
> handling.  

How many instructions does it take to subtract 4 bytes from the SP?

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