Re: Question: MCF5275 parameter passing assembly in C code

Possibly, two Freescale sets of source code (CodeWarrior) can help:
1.
DSPLIBUM : Digital Signal Processing Libraries Using the ColdFire eMAC and MAC
(pdf)
http://www.freescale.com/files/32bit/doc/ref_manual/DSPLIBUM.pdf?fsrch=1
"This document provides a library of macros designed to ensure efficient
programming of the ColdFire processor using MAX..."
DSPLIBUMSW : "Digital Signal Processing Libraries Using the ColdFire eMAC and
MAC User's Manual" Software (zip)
http://www.freescale.com/webapp/sps/download/license.jsp?colCode=DSPLIBUMSW&location=null&fsrch=1
"Accompanying software to the "Digital Signal Processing Libraries Using the
ColdFire eMAC and MAC User's Manual"

2.
CFLMOPM : Library of Macros for Optimization Using eMAC and MAC Programmer's
Manual (pdf)
"This programmer's manual provides a detailed description of a set of macros
used for optimizations."
http://www.freescale.com/files/32bit/doc/ref_manual/CFLMOPM.pdf?fsrch=1
CFLMOPMSW : Software for the Library of Macros for Optimization Using eMAC and
MAC Programmer's Manual (zip)
https://www.freescale.com/webapp/Download?colCode=CFLMOPMSW&appType=license&location=null&fsrch=1
"Software for the CFLMOPM"

--- Andy Gabler <[email protected]> wrote:

> Greetings all,
> 
> I am working on an FIR filter to implement on the MCF5275.  When I
> compile my FIR filter from C it uses the "mul" command rather than the
> "mac" command to implement the multiply accumulate stage of the FIR
> filter.  I would like to place some assembly code inline to force the
> use of the "mac" command.
> 
> This is what I have been playing with and would like to do; however, I
> do not know the proper way to define which register my variable in C
> (like "itap") gets stored in so I can reference it in my "mac"
> instruction.  Can anyone shed any light on how to do this?
> 
> 	//sum += taps[i] * delayLine[i];
> 	itap = taps[i];
> 	iDelayLine = delayLine[i];		
> 	asm ("move.l _itap, %d0\n\t"
> 		"move.l _iDelayLine, %d1\n\t"
> 		"mac.w %d0.l, %d1.l 00, %ACC0");
> 	delayLine[i+1] = delayLine[i];
> 
> Also do any of you have any idea why the compiler comes up with this error:
> 
> "/tmp/ccjIiru2.s Error: syntax error -- statement `mac.w %d0.l,%d1.l
> 00,%ACC0' ignored"
> 
> concerning my mac instruction?
> 
> Thank you!
> 
> -andy
> ---
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Regards,
    Yevgeni Tunik
    052-448-9271


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