Hey ! I wrote RTL prolog code.
-----Original Message-----
From: Weddington, Eric <[EMAIL PROTECTED]>
To: Jeff Barlow <[EMAIL PROTECTED]>; avr-gcc-list@nongnu.org; Stu Bell
<[EMAIL PROTECTED]>
Sent: Thu, 10 Apr 2008 2:42 pm
Subject: RE: [avr-gcc-list] Odd prologue for ATmega256x in
WinAVR20080407
-----Original Message-----
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
org] On Behalf Of Jeff Barlow
Sent: Thursday, April 10, 2008 9:10 AM
To: avr-gcc-list@nongnu.org
Subject: Re: [avr-gcc-list] Odd prologue for ATmega256x in
WinAVR20080407
Stu Bell <[EMAIL PROTECTED]> wrote:
>What does the double "rcall ." do?
It just adjusts the stack pointer prior to loading it as the
local frame pointer. It's a fairly cute optimization actually.
Hi Stu,
Don't feel bad. When I first saw this, I thought the same thing: "Huh?,
What's this?" After some quick double checking in the instruction set
manual, it finally made sense. I agree with Jeff, it's quite a trick
optimization. Thanks go to Anatoly Sokolov. ;-)
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