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. Steve Ellcey [EMAIL PROTECTED]
