> Hi,
>
> Thanks a lot. Basically, I want to obtain dynamic basic block frequency at
> RTL
> level just before register allocation. Look at the following piece of
> code(a.c):
>
> void foo(int i, int *a, int *p) {
> int x1,j;
> for(j=0;j<200;j++) {
> x1=a[i]+j;
> *p=99;
> a[i]=x1;
> }
> }
>
> main() {
> int *a,*p,i=0;
> int x1,x2,x3,x4;
> a=malloc(sizeof(int));
> p=malloc(sizeof(int));
> a[0]=0;
> foo(0,a,p);
> printf("\n%d ",*p);
> for(i=0;i<1;i++) {
> printf(" %d ",a[i]);
> }
> }
>
> This code was executed using "gcc -O3 -fprofile-arcs --param
> max-unroll-times=0 a.c".
> "a.out" was then executed (for profiling).
> Now I compile using "gcc -O3 -fbranch-probabilities --param
> max-unroll-times=0 a.c".
> During this phase, I try to obtain dynamic frequencies of the statements
> within the "for"
> loop in "foo" method at RTL level. The frequencies return "0" using
> "bb->count". I
> would like this to reflect "200". How to obtain this information?
I think the problem is that foo gets inlined into main, so the offline
copy of foo is really never executed.
Honza
>
> regards,
> Raj
>
>
>
>
>
>
>
> Jan Hubicka <[EMAIL PROTECTED]>
> 07/18/2005 10:29 AM
>
> To
> Rajkishore Barik/India/[EMAIL PROTECTED]
> cc
> gcc@gcc.gnu.org
> Subject
> Re: -fprofile-arcs
>
>
>
>
>
>
> > Hi,
> >
> > I am trying to profile the frequency of each basic block of
> > SPEC 2000 benchmarks by compiling them using -fprofile-arcs and opt -O3.
> > After running the benchmark, when I try to read "bb->count" while
> > compiling
> > using "-fbranch-probabilities and -O3", I get "0" values for basic
> blocks
> > which were known to execute for sure. Any clue as to where I am missing?
> > Is "bb->count" is the right way to get the dynamic frequency in the
> second
> > pass?
>
> It is. You would need to provide more information for me to figure out
> what is going wrong. Of course the bb->count is initialized only after
> profile is read in that at current mainline is pretty late in
> compilation queue (after bp RTL pass), but this is going to change
> hopefully at monday.
>
> Honza
> >
> > regards,
> > Raj
>
