fixing commit fuckup

1 files changed, 12 insertions, 7 deletions

diff --git a/llvm_mode/README.llvm b/llvm_mode/README.llvm
index 77c406f8..779ff47c 100644
--- a/llvm_mode/README.llvm
+++ b/llvm_mode/README.llvm
@@ -88,13 +88,18 @@ which C/C++ files to actually intrument. See README.whitelist
 
 For splitting memcmp, strncmp, etc. please see README.laf-intel
 
-As the original afl llvm_mode implementation has been replaced with
-then much more effective instrim (https://github.com/csienslab/instrim/) 
-there is an option for optimizing loops. This optimization shows which
-part of the loop has been selected, but not how many time a loop has been
-called in a row (unless its a complex loop and a block inside was
-instrumented). If you want to enable this set the environment variable
-LOOPHEAD=1
+Then there is an optimized instrumentation strategy that uses CFGs and
+markers to just instrument what is needed. This increases speed by 20-25%
+however has a lower path discovery.
+If you want to use this, set AFL_LLVM_INSTRIM=1
+See README.instrim
+
+Finally if your llvm version is 8 or lower, you can activate a mode that
+prevents that a counter overflow result in a 0 value. This is good for
+path discovery, but the llvm implementation for intel for this functionality
+is not optimal and was only fixed in llvm 9.
+You can set this with AFL_LLVM_NOT_ZERO=1
+See README.neverzero
 
 
 4) Gotchas, feedback, bugs