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On Tue, Feb 18, 2014 at 10:15 PM, Bob Wilson <bob.wilson at apple.com> wrote: > Our instrumentation code is basically done now, so you can try it out and > compare the performance. Just build with -finstr-profile-generate. > Is this in trunk? clang-3.5: error: unknown argument: '-finstr-profile-generate' --kcc > You may want to hack the compiler-rt code in lib/profile/PGOProfiling.c to > disable writing the output, since the current implementation is pretty > naive. > >...

Regarding performance, I've made a simple coverage with counters and compared it with AsanCoverage. AsanCoverage produces code like this: mov 0xe86cce(%rip),%al test %al,%al je 48b4a0 # to call __sanitizer_cov ... callq 4715b0 <__sanitizer_cov> A simple counter-based thing (which just increments counters and does nothing else useful) produces this: incq 0xe719c6(%rip) The

...at google.com> wrote: > >> >> >> >> On Tue, Feb 18, 2014 at 10:15 PM, Bob Wilson <bob.wilson at apple.com>wrote: >> >>> Our instrumentation code is basically done now, so you can try it out >>> and compare the performance. Just build with -finstr-profile-generate. >>> >> >> Is this in trunk? >> clang-3.5: error: unknown argument: '-finstr-profile-generate' >> >> --kcc >> >> >>> You may want to hack the compiler-rt code in lib/profile/PGOProfiling.c >>> to disable w...