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To: <djgpp AT delorie DOT com>
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In-Reply-To: <e0a39940-61ac-4916-90f4-5a7b06c05a9d@i25g2000prd.googlegroups.com>
Subject: RE: PB on CPU Atom
Date: Tue, 4 Jan 2011 14:03:39 -0500
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Reply-To: djgpp AT delorie DOT com

Hello. I'm not sure if someone has suggested this before, but have you tried
to inline "affcarinchtest". That seems to be a fairly long loop. Depending
on gcc, you might have to use something along the lines of
__attribute__((always_inline)). I don't think "inline" alone works like it
used to.

-----Original Message-----
From: philippe [mailto:philippe DOT meynard AT gmail DOT com] 
Sent: Tuesday, January 04, 2011 11:25 AM
To: djgpp AT delorie DOT com
Subject: Re: PB on CPU Atom

> I discovered that: When I used a call who is in another source file
> that my source file test then the program is very slow but when I put
> the call function in the same file that the source test then the
> program is very fast. Why?


Hi, everybody and happy new year.
I come back on my problem and in fact I discovered this.
my test program use 2 source file. see :

test1.c

vois test1(void)
{
                char a;
	uint64 debclock1,finclock1;
	uint64 tpscalc;
	long tpscalc2;
	char chaine[80];
	int i;

	init_cpu_speed();
                printf("start\n");
                debclock1=get_rdtsc();
	for(i=0;i<3200000;i++){
		affcarinchtest2(a,chaine);
		a++;
		if(a>'Z') a=65;
	}
	finclock1=get_rdtsc();
	tpscalc=finclock1-debclock1;
	tpscalc2=(long)(((tpscalc*MULT_COUNT_US)/COUNT_CPU_BY_SECOND));
	printf("time 1: %ld\n",((long)tpscalc2));
}

test2.c

void affcarinchtest(char chaine,char *ptrch)
{
	*ptrch=chaine;
}

when I compile this only 2 files I have a executed time correct, but
When I compile this file with another source files and who create a
big program (> 3Mo) then I have a executed time very long (10 time
longer!)  I suppose that the problem is the call function is different
if the call is short or long ?
I test with many different option(like Rugxulo suggest : mtune,
without O3, etc), without succes. With different version of gcc,
without succces
I haven't test with -Atom option of gcc because it's only implemented
on gcc 4.5 and not on djgpp.
Have you a suggestion?

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