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From: labb-2ae@e260-2d.berkeley.edu (Joe C.)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Writing small code in SAS/C 5.10
Message-ID: <1990Sep29.214241.27653@agate.berkeley.edu>
Date: 29 Sep 90 21:42:41 GMT
References: <13148@leadsv.UUCP> <12482@ogicse.ogi.edu>
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In article <12482@ogicse.ogi.edu> jmeissen@ogicse.ogi.edu (John Meissen) writes:
>In article <13148@leadsv.UUCP> lord@leadsv.UUCP (Parker Lord) writes:
[deleted]
>>program that does nothing more than a printf("Hello\n");  I compiled and linked
>>this using lc -L.  This code came out at about 4.6K.  In comparison, the
>[deleted]
>Aaaack! This is one of my pet peeves! Does anybody out there have ANY idea
>how much work printf() does and how large it is? If you want to write the
>largest program possible for printing a string, use printf()! Please,
>please, please don't use printf() for size comparisons.

Lattice (or is that SAS/C) has three different versions of printf().  If you
include <stdio.h> in the beginning, then the compiler will use
	_writes() if you only have a string.
	_tinyprintf() if all you have is %s,%s or %p.

This can result in a saving of > 2K in final code size.

Also, the main program itself is not the culprit, it is the linking process
that increases your size.

If you tried:
#include <stdio.h>
{ printf("Hello\n"); }

An compiled with lc -Lncd -O -v

Then the assembly output would be roughly

PEA       01.00000000(A4)
JSR       __writes(PC)
ADDQW    #4,A7
RTS

But if you look at the map file of the linker, it brings in lc.lib and uses
about 40 functions in there.

-jc