[Bug sanitizer/97229] pointer-compare sanitizer is very slow due to __asan::IsAddressNearGlobal

mail at milianw dot de gcc-bugzilla@gcc.gnu.org
Wed Sep 30 13:26:13 GMT 2020


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97229

--- Comment #2 from Milian Wolff <mail at milianw dot de> ---
As I said, >99% of the samples point to this backtrace:

```
<our code>
__sanitizer_ptr_cmp
__asanCheckForInvalidPointerPair
__asanCheckForInvalidPointerPair
__asan::IsInvalidPointerPair
__asan::GetGlobalAddressInformation(unsigned long, unsigned long, ...)
__asan::GetGlobalsForAddress(unsigned long, __asan_global*, ...)
__asan::isAddressNearGlobal
```

if you want per-line cost attribution, I'd first have to compile the sanitizer
runtime with debug symbols.

If you really need the `perf report` output instead (why?) I can redo the
measurement again.


More information about the Gcc-bugs mailing list