Author: kcc
Date: Thu Jan 31 15:43:00 2019
New Revision: 352818
URL: http://llvm.org/viewvc/llvm-project?rev=352818&view=rev
Log:
[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
Modified:
cfe/trunk/docs/SanitizerCoverage.rst
Modified: cfe/trunk/docs/SanitizerCoverage.rst
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/SanitizerCoverage.rst?rev=352818&r1=352817&r2=352818&view=diff
==============================================================================
--- cfe/trunk/docs/SanitizerCoverage.rst (original)
+++ cfe/trunk/docs/SanitizerCoverage.rst Thu Jan 31 15:43:00 2019
@@ -248,6 +248,9 @@ and with ``-fsanitize-coverage=trace-ge
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.
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