diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/ChangeLog | 2 | ||||
| -rw-r--r-- | docs/env_variables.txt | 7 |
2 files changed, 7 insertions, 2 deletions
diff --git a/docs/ChangeLog b/docs/ChangeLog index 73c69196..a533de05 100644 --- a/docs/ChangeLog +++ b/docs/ChangeLog @@ -17,6 +17,8 @@ sending a mail to <afl-users+subscribe@googlegroups.com>. Version ++2.52d (tbd): ----------------------------- + - added never zero counters for afl-gcc and optional (because of an + optimization issue in llvm < 9) for llvm_mode (AFL_LLVM_NEVER_ZERO=1) - added whitelist support for llvm_mode via AFL_LLVM_WHITELIST to allow only to instrument what is actually interesting. Gives more speed and less map pollution (originally by choller@mozilla) diff --git a/docs/env_variables.txt b/docs/env_variables.txt index 725dc82e..f8c6c86a 100644 --- a/docs/env_variables.txt +++ b/docs/env_variables.txt @@ -108,8 +108,11 @@ Then there are a few specific features that are only available in llvm_mode: OTHER ===== - - Setting AFL_NZERO_COUNTS=1 during compilation will use counters - that skip zero on overflow. + - Setting export AFL_LLVM_NOT_ZERO=1 during compilation will use counters + that skip zero on overflow. This is the default for llvm >= 9, + however for llvm versions below that this will increase an unnecessary + slowdown due a performance issue that is only fixed in llvm 9+. + This feature increases path discovery by a little bit. Note that AFL_INST_RATIO will behave a bit differently than for afl-gcc, because functions are *not* instrumented unconditionally - so low values |