On Tue, Oct 7, 2008 at 1:18 AM, Steve Ellcey <[EMAIL PROTECTED]> wrote: > I have been looking at why g++.dg/tree-prof/indir-call-prof.C fails on > IA64 (HP-UX and Linux). It looks like the optimization (turning an > indirect call into a direct call) does not happen because the initial > run with -fprofile-generate is not generating any count data about > indirect calls. > > Comparing x86 (where things work) and IA64 (where they do not), I see > the test case, when compiled with -fprofile-generate, has calls > __gcov_indirect_call_profiler in both cases. But on IA64, cur_func is > never equal to callee_func and so __gcov_one_value_profiler_body is > never called. On x86 we do have cur_func equal to callee_func and so > __gcov_one_value_profiler_body is called to write out profile > information. > > This is about as far as I have gotten. I am not sure why there is this > difference or how to fix it. I *think* it may be related to the fact > that IA64 GCC defines TARGET_VTABLE_USES_DESCRIPTORS but my only reason > for thinking that is that IA64 is the only platform that defines this > macro and I think that the profiler must be getting callee addresses out > of the vtable (though I am not sure about that and I don't know where it > would be doing it from). > > So this is a request to anyone who might know the profiling code to help > me with some advise about what I should look at next or about how to go > about fixing this bug.
If these testcases never worked on IA64 I suggest you XFAIL them for IA64 and file a missed-optimization bugreport. Richard. > Steve Ellcey > [EMAIL PROTECTED] >
