------- Comment #7 from irar at il dot ibm dot com 2007-07-03 12:57 -------
(In reply to comment #6)
> Distance vectors are lexicographically positive vectors, that is why you get
> the 1
> in all these cases. If you want to know which one comes first, you have to
> look
> at the DR_IS_READ for both references in the dependence relation.
I am sorry, but I still don't understand.
For
for (i = 0; i < N; i++){
ia[i+1] = ia[i] * 4;
}
the ddr is {ld, st} and distance 1
and for
for (i = 0; i < N; i++){
ia[i] = ia[i+1] * 4;
}
the ddr is also {ld, st} with distance 1.
How can we distinguish between these cases?
Thanks,
Ira
--
irar at il dot ibm dot com changed:
What |Removed |Added
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CC| |irar at il dot ibm dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32377
