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RE: [avr-gcc-list] GCC code gen on xmega
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From: |
Weddington, Eric |
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Subject: |
RE: [avr-gcc-list] GCC code gen on xmega |
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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?