search for: 400b90

On Fri, Apr 18, 2014 at 12:13 AM, Dmitry Vyukov <dvyukov at google.com> wrote: > Hi, > > This is long thread, so I will combine several comments into single email. > > > >> - 8-bit per-thread counters, dumping into central counters on overflow. > >The overflow will happen very quickly with 8bit counter. > > Yes, but it reduces contention by 256x (a thread

...r this function: > std::vector<int> v(1000); > void foo() { v[0] = 42; } > > Here we have a single basic block and a call, but since the coverage is emitted by the > FE before inlining (and is also emitted for std::vector methods) we get this assembler at -O2: > 0000000000400b90 <_Z3foov>: > 400b90: 48 ff 05 11 25 20 00 incq 0x202511(%rip) # 6030a8 <__llvm_profile_counters__Z3foov> > 400b97: 48 ff 05 42 25 20 00 incq 0x202542(%rip) # 6030e0 <__llvm_profile_counters__ZNSt6vectorIiSaIiEEixEm> > 400b9e:...