My thanks to all involved! Very clever! Only reason I asked was I was comparing code between 20071221 and 20080407 (still trying to get my code running on the latest gcc) and came across it.
Best regards, Stu Bell DataPlay (DPHI, Inc.) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, April 10, 2008 12:53 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; avr-gcc-list@nongnu.org; Stu Bell Subject: Re: [avr-gcc-list] Odd prologue for ATmega256x in WinAVR20080407 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. ;-) _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
