From: Kostya Serebryany <kcc@google.com>
Date: Thu, 31 Jan 2019 23:43:00 +0000 (+0000)
Subject: [sanitizer-coverage] prune trace-cmp instrumentation for CMP isntructions that feed... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e547ac93b1f29de11229551510baa6ee6ac3b8d6;p=clang

[sanitizer-coverage] prune trace-cmp instrumentation for CMP isntructions that feed into the backedge branch. Instrumenting these CMP instructions is almost always useless (and harmful) for fuzzing

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@352818 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/docs/SanitizerCoverage.rst b/docs/SanitizerCoverage.rst
index 728aa2f77f..c5c50a5dd9 100644
--- a/docs/SanitizerCoverage.rst
+++ b/docs/SanitizerCoverage.rst
@@ -248,6 +248,9 @@ and with  ``-fsanitize-coverage=trace-gep`` --
 the `LLVM GEP instructions <https://llvm.org/docs/GetElementPtr.html>`_
 (to capture array indices).
 
+Unless ``no-prune`` option is provided, some of the comparison instructions
+will not be instrumented.
+
 .. code-block:: c++
 
   // Called before a comparison instruction.