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| author | van Hauser <vh@thc.org> | 2019-07-05 11:28:08 +0200 |
|---|---|---|
| committer | van Hauser <vh@thc.org> | 2019-07-05 11:28:08 +0200 |
| commit | 7f6aaa53147afd4feb549214f49d0f5f69e4af6c (patch) | |
| tree | 9e99e541b9df310af959b4ac8d893ec24ab3fd11 /docs/env_variables.txt | |
| parent | 9199967022284da0ee4d78459d8d34513540cf32 (diff) | |
| download | afl++-7f6aaa53147afd4feb549214f49d0f5f69e4af6c.tar.gz | |
final touches
Diffstat (limited to 'docs/env_variables.txt')
| -rw-r--r-- | docs/env_variables.txt | 7 |
1 files changed, 5 insertions, 2 deletions
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 |