diff options
Diffstat (limited to 'llvm_mode/README.neverzero.md')
| -rw-r--r-- | llvm_mode/README.neverzero.md | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/llvm_mode/README.neverzero.md b/llvm_mode/README.neverzero.md index 1e406560..903e5bd3 100644 --- a/llvm_mode/README.neverzero.md +++ b/llvm_mode/README.neverzero.md @@ -20,8 +20,16 @@ This is implemented in afl-gcc, however for llvm_mode this is optional if the llvm version is below 9 - as there is a perfomance bug that is only fixed in version 9 and onwards. -If you want to enable this for llvm < 9 then set +If you want to enable this for llvm versions below 9 then set ``` export AFL_LLVM_NOT_ZERO=1 ``` + +In case you are on llvm 9 or greater and you do not want this behaviour then +you can set: +``` +AFL_LLVM_SKIP_NEVERZERO=1 +``` +If the target does not have extensive loops or functions that are called +a lot then this can give a small performance boost. |