Hi, all,
I do not want to modify the old loop optimizer defined
in loop.c. I am preparing to port some improvements
done on gcc-3.5 to gcc-4.0, and the GIV optimizations
is one of my concerns.
On IA-64, the GIV optimizations can hardly improve the
performance. The reason is that
check_ext_de
I modified the code in check_ext_dependent_givs to let
the BIVs always successfully pass the check, then test
the example you have given to me, but the result is
the same as before.
It depends on whether the old loop optimizer will actually decide that
it is worthwhile to use the induction var
Hi, Bonzini,
Thank you for your reponse.
I do not want to modify the old loop optimizer defined
in loop.c. I am preparing to port some improvements
done on gcc-3.5 to gcc-4.0, and the GIV optimizations
is part of my concerns.
On IA-64, the GIV optimization can hardly improve the
performance.
Canqun Yang wrote:
Hi, all,
Is there anyone familiar with the check routine
check_ext_dependent_givs defined loop.c, and give me
an example explaining why it is needed.
You should not look at loop.c to modify it, because it will hopefully
disappear before 4.1.
But basically, that function looks
