> Hi, > > the issue in PR 49786 has been well summarized in comment #12. > Basically, the multiplication we do when updating counts of edges > overflows. I looked at how this was handled previously in IPA-CP and > the following should be an equivalent solution. > > This patch fixes the LTO profiled bootstrap and I have tested it by > doing a usual non-LTO and non-profiled bootstrap and testsuite > (without any issues) run as well as running the testsuite on the > compiler produced by the LTO profiled bootstrap. I compared the > second set of testsuite results with both the results obtained from a > revision before the IPA-CP submission and the current normal bootstrap > ones and it seemed fine (although there were a few dump scan > failures). (All of the above was done on x86_64-linux.) > > So, OK for trunk?
Ok, thanks as a general rule we can't do second power of count in 64bit value, so my referred solution is this REG_BR_PROB_BASE fixed point math. Honza
