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-# InsTrim
-
-InsTrim: Lightweight Instrumentation for Coverage-guided Fuzzing
-
-## Introduction
-
-InsTrim is the work of Chin-Chia Hsu, Che-Yu Wu, Hsu-Chun Hsiao and Shih-Kun Huang.
-
-It uses a CFG (call flow graph) and markers to instrument just what
-is necessary in the binary (ie less than llvm_mode). As a result the binary is
-about 10-15% faster compared to normal llvm_mode however with some coverage loss.
-It requires at least llvm version 3.8.0 to build.
-If you have LLVM 7+ we recommend PCGUARD instead.
-
-## Usage
-
-Set the environment variable `AFL_LLVM_INSTRUMENT=CFG` or `AFL_LLVM_INSTRIM=1`
-during compilation of the target.
-
-There is also special mode which instruments loops in a way so that
-afl-fuzz can see which loop path has been selected but not being able to
-see how often the loop has been rerun.
-This again is a tradeoff for speed for less path information.
-To enable this mode set `AFL_LLVM_INSTRIM_LOOPHEAD=1`.
-
-## Background
-
-The paper from Chin-Chia Hsu, Che-Yu Wu, Hsu-Chun Hsiao and Shih-Kun Huang:
-[InsTrim: Lightweight Instrumentation for Coverage-guided Fuzzing]
-(https://www.ndss-symposium.org/wp-content/uploads/2018/07/bar2018_14_Hsu_paper.pdf)